Access to Employee Exposure and Medical Records (29 CFR 1910.1020)

Electronic Code of Federal Regulations
e-CFR data is current as of May 11, 2021
Title 29 → Subtitle B → Chapter XVII → Part 1910 → Subpart Z → §1910.1020

Title 29: Labor
PART 1910—OCCUPATIONAL SAFETY AND HEALTH STANDARDS (CONTINUED)
Subpart Z—Toxic and Hazardous Substances

§1910.1020 Access to employee exposure and medical records.
(a) Purpose. The purpose of this section is to provide employees and their designated representatives a
right of access to relevant exposure and medical records; and to provide representatives of the Assistant
Secretary a right of access to these records in order to fulfill responsibilities under the Occupational Safety and
Health Act. Access by employees, their representatives, and the Assistant Secretary is necessary to yield both
direct and indirect improvements in the detection, treatment, and prevention of occupational disease. Each
employer is responsible for assuring compliance with this section, but the activities involved in complying
with the access to medical records provisions can be carried out, on behalf of the employer, by the physician or
other health care personnel in charge of employee medical records. Except as expressly provided, nothing in
this section is intended to affect existing legal and ethical obligations concerning the maintenance and
confidentiality of employee medical information, the duty to disclose information to a patient/employee or any
other aspect of the medical-care relationship, or affect existing legal obligations concerning the protection of
trade secret information.
(b) Scope and application. (1) This section applies to each general industry, maritime, and construction
employer who makes, maintains, contracts for, or has access to employee exposure or medical records, or
analyses thereof, pertaining to employees exposed to toxic substances or harmful physical agents.
(2) This section applies to all employee exposure and medical records, and analyses thereof, of such
employees, whether or not the records are mandated by specific occupational safety and health standards.
(3) This section applies to all employee exposure and medical records, and analyses thereof, made or
maintained in any manner, including on an in-house of contractual (e.g., fee-for-service) basis. Each employer
shall assure that the preservation and access requirements of this section are complied with regardless of the
manner in which the records are made or maintained.
(c) Definitions—(1) Access means the right and opportunity to examine and copy.
(2) Analysis using exposure or medical records means any compilation of data or any statistical study
based at least in part on information collected from individual employee exposure or medical records or
information collected from health insurance claims records, provided that either the analysis has been reported
to the employer or no further work is currently being done by the person responsible for preparing the analysis.
(3) Designated representative means any individual or organization to whom an employee gives written
authorization to exercise a right of access. For the purposes of access to employee exposure records and

analyses using exposure or medical records, a recognized or certified collective bargaining agent shall be
treated automatically as a designated representative without regard to written employee authorization.
(4) Employee means a current employee, a former employee, or an employee being assigned or
transferred to work where there will be exposure to toxic substances or harmful physical agents. In the case of
a deceased or legally incapacitated employee, the employee's legal representative may directly exercise all the
employee's rights under this section.
(5) Employee exposure record means a record containing any of the following kinds of information:
(i) Environmental (workplace) monitoring or measuring of a toxic substance or harmful physical agent,
including personal, area, grab, wipe, or other form of sampling, as well as related collection and analytical
methodologies, calculations, and other background data relevant to interpretation of the results obtained;
(ii) Biological monitoring results which directly assess the absorption of a toxic substance or harmful
physical agent by body systems (e.g., the level of a chemical in the blood, urine, breath, hair, fingernails, etc)
but not including results which assess the biological effect of a substance or agent or which assess an
employee's use of alcohol or drugs;
(iii) Material safety data sheets indicating that the material may pose a hazard to human health; or
(iv) In the absence of the above, a chemcial inventory or any other record which reveals where and when
used and the identity (e.g., chemical, common, or trade name) of a toxic substance or harmful physical agent.
(6)(i) Employee medical record means a record concerning the health status of an employee which is
made or maintained by a physician, nurse, or other health care personnel or technician, including:
(A) Medical and employment questionnaires or histories (including job description and occupational
exposures),
(B) The results of medical examinations (pre-employment, pre-assignment, periodic, or episodic) and
laboratory tests (including chest and other X-ray examinations taken for the purposes of establishing a baseline or detecting occupational illness, and all biological monitoring not defined as an “employee exposure
record”),
(C) Medical opinions, diagnoses, progress notes, and recommendations,
(D) First aid records,
(E) Descriptions of treatments and prescriptions, and
(F) Employee medical complaints.
(ii) “Employee medical record” does not include medical information in the form of:
(A) Physical specimens (e.g., blood or urine samples) which are routinely discarded as a part of normal
medical practice; or
(B) Records concerning health insurance claims if maintained separately from the employer's medical
program and its records, and not accessible to the employer by employee name or other direct personal
identifier (e.g., social security number, payroll number, etc.); or

(C) Records created solely in preparation for litigation which are privileged from discovery under the
applicable rules of procedure or evidence; or
(D) Records concerning voluntary employee assistance programs (alcohol, drug abuse, or personal
counseling programs) if maintained separately from the employer's medical program and its records.
(7) Employer means a current employer, a former employer, or a successor employer.
(8) Exposure or exposed means that an employee is subjected to a toxic substance or harmful physical
agent in the course of employment through any route of entry (inhalation, ingestion, skin contact or absorption,
etc.), and includes past exposure and potential (e.g., accidental or possible) exposure, but does not include
situations where the employer can demonstrate that the toxic substance or harmful physical agent is not used,
handled, stored, generated, or present in the workplace in any manner different from typical non-occupational
situations.
(9) Health Professional means a physician, occupational health nurse, industrial hygienist, toxicologist,
or epidemiologist, providing medical or other occupational health services to exposed employees.
(10) Record means any item, collection, or grouping of information regardless of the form or process by
which it is maintained (e.g., paper document, microfiche, microfilm, X-ray film, or automated data
processing).
(11) Specific chemical identity means the chemical name, Chemical Abstracts Service (CAS) Registry
Number, or any other information that reveals the precise chemical designation of the substance.
(12)(i) Specific written consent means a written authorization containing the following:
(A) The name and signature of the employee authorizing the release of medical information,
(B) The date of the written authorization,
(C) The name of the individual or organization that is authorized to release the medical information,
(D) The name of the designated representative (individual or organization) that is authorized to receive
the released information,
(E) A general description of the medical information that is authorized to be released,
(F) A general description of the purpose for the release of the medical information, and
(G) A date or condition upon which the written authorization will expire (if less than one year).
(ii) A written authorization does not operate to authorize the release of medical information not in
existence on the date of written authorization, unless the release of future information is expressly authorized,
and does not operate for more than one year from the date of written authorization.
(iii) A written authorization may be revoked in writing prospectively at any time.

(13) Toxic substance or harmful physical agent means any chemical substance, biological agent
(bacteria, virus, fungus, etc.), or physical stress (noise, heat, cold, vibration, repetitive motion, ionizing and
non-ionizing radiation, hypo-or hyperbaric pressure, etc.) which:
(i) Is listed in the latest printed edition of the National Institute for Occupational Safety and Health
(NIOSH) Registry of Toxic Effects of Chemical Substances (RTECS), which is incorporated by reference as
specified in §1910.6; or
(ii) Has yielded positive evidence of an acute or chronic health hazard in testing conducted by, or known
to, the employer; or
(iii) Is the subject of a material safety data sheet kept by or known to the employer indicating that the
material may pose a hazard to human health.
(14) Trade secret means any confidential formula, pattern, process, device, or information or compilation
of information that is used in an employer's business and that gives the employer an opportunity to obtain an
advantage over competitors who do not know or use it.
(d) Preservation of records. (1) Unless a specific occupational safety and health standard provides a
different period of time, each employer shall assure the preservation and retention of records as follows:
(i) Employee medical records. The medical record for each employee shall be preserved and maintained
for at least the duration of employment plus thirty (30) years, except that the following types of records need
not be retained for any specified period:
(A) Health insurance claims records maintained separately from the employer's medical program and its
records,
(B) First aid records (not including medical histories) of one-time treatment and subsequent observation
of minor scratches, cuts, burns, splinters, and the like which do not involve medical treatment, loss of
consciousness, restriction of work or motion, or transfer to another job, if made on-site by a non-physician and
if maintained separately from the employer's medical program and its records, and
(C) The medical records of employees who have worked for less than (1) year for the employer need not
be retained beyond the term of employment if they are provided to the employee upon the termination of
employment.
(ii) Employee exposure records. Each employee exposure record shall be preserved and maintained for at
least thirty (30) years, except that:
(A) Background data to environmental (workplace) monitoring or measuring, such as laboratory reports
and worksheets, need only be retained for one (1) year as long as the sampling results, the collection
methodology (sampling plan), a description of the analytical and mathematical methods used, and a summary
of other background data relevant to interpretation of the results obtained, are retained for at least thirty (30)
years; and
(B) Material safety data sheets and paragraph (c)(5)(iv) records concerning the identity of a substance or
agent need not be retained for any specified period as long as some record of the identity (chemical name if
known) of the substance or agent, where it was used, and when it was used is retained for at least thirty (30)
years;1and

1

Material safety data sheets must be kept for those chemicals currently in use that are effected by the Hazard
Communication Standard in accordance with 29 CFR 1910.1200(g).

(C) Biological monitoring results designated as exposure records by specific occupational safety and
health standards shall be preserved and maintained as required by the specific standard.
(iii) Analyses using exposure or medical records. Each analysis using exposure or medial records shall be
preserved and maintained for at least thirty (30) years.
(2) Nothing in this section is intended to mandate the form, manner, or process by which an employer
preserves a record as long as the information contained in the record is preserved and retrievable, except that
chest X-ray films shall be preserved in their original state.
(e) Access to records—(1) General. (i) Whenever an employee or designated representative requests
access to a record, the employer shall assure that access is provided in a reasonable time, place, and manner. If
the employer cannot reasonably provide access to the record within fifteen (15) working days, the employer
shall within the fifteen (15) working days apprise the employee or designated representative requesting the
record of the reason for the delay and the earliest date when the record can be made available.
(ii) The employer may require of the requester only such information as should be readily known to the
requester and which may be necessary to locate or identify the records being requested (e.g. dates and locations
where the employee worked during the time period in question).
(iii) Whenever an employee or designated representative requests a copy of a record, the employer shall
assure that either:
(A) A copy of the record is provided without cost to the employee or representative,
(B) The necessary mechanical copying facilities (e.g., photocopying) are made available without cost to
the employee or representative for copying the record, or
(C) The record is loaned to the employee or representative for a reasonable time to enable a copy to be
made.
(iv) In the case of an original X-ray, the employer may restrict access to on-site examination or make
other suitable arrangements for the temporary loan of the X-ray.
(v) Whenever a record has been previously provided without cost to an employee or designated
representative, the employer may charge reasonable, non-discriminatory administrative costs (i.e., search and
copying expenses but not including overhead expenses) for a request by the employee or designated
representative for additional copies of the record, except that
(A) An employer shall not charge for an initial request for a copy of new information that has been added
to a record which was previously provided; and
(B) An employer shall not charge for an initial request by a recognized or certified collective bargaining
agent for a copy of an employee exposure record or an analysis using exposure or medical records.
(vi) Nothing in this section is intended to preclude employees and collective bargaining agents from
collectively bargaining to obtain access to information in addition to that available under this section.

(2) Employee and designated representative access—(i) Employee exposure records. (A) Except as
limited by paragraph (f) of this section, each employer shall, upon request, assure the access to each employee
and designated representative to employee exposure records relevant to the employee. For the purpose of this
section, an exposure record relevant to the employee consists of:
(1) A record which measures or monitors the amount of a toxic substance or harmful physical agent to
which the employee is or has been exposed;
(2) In the absence of such directly relevant records, such records of other employees with past or present
job duties or working conditions related to or similar to those of the employee to the extent necessary to
reasonably indicate the amount and nature of the toxic substances or harmful physical agents to which the
employee is or has been subjected, and
(3) Exposure records to the extent necessary to reasonably indicate the amount and nature of the toxic
substances or harmful physical agents at workplaces or under working conditions to which the employee is
being assigned or transferred.
(B) Requests by designated representatives for unconsented access to employee exposure records shall be
in writing and shall specify with reasonable particularity:
(1) The records requested to be disclosed; and
(2) The occupational health need for gaining access to these records.
(ii) Employee medical records. (A) Each employer shall, upon request, assure the access of each
employee to employee medical records of which the employee is the subject, except as provided in paragraph
(e)(2)(ii)(D) of this section.
(B) Each employer shall, upon request, assure the access of each designated representative to the
employee medical records of any employee who has given the designated representative specific written
consent. appendix A to this section contains a sample form which may be used to establish specific written
consent for access to employee medical records.
(C) Whenever access to employee medical records is requested, a physician representing the employer
may recommend that the employee or designated representative:
(1) Consult with the physician for the purposes of reviewing and discussing the records requested,
(2) Accept a summary of material facts and opinions in lieu of the records requested, or
(3) Accept release of the requested records only to a physician or other designated representative.
(D) Whenever an employee requests access to his or her employee medical records, and a physician
representing the employer believes that direct employee access to information contained in the records
regarding a specific diagnosis of a terminal illness or a psychiatric condition could be detrimental to the
employee's health, the employer may inform the employee that access will only be provided to a designated
representative of the employee having specific written consent, and deny the employee's request for direct
access to this information only. Where a designated representative with specific written consent requests
access to information so withheld, the employer shall assure the access of the designated representative to this
information, even when it is known that the designated representative will give the information to the
employee.

(E) A physician, nurse, or other responsible health care personnel maintaining medical records may
delete from requested medical records the identity of a family member, personal friend, or fellow employee
who has provided confidential information concerning an employee's health status.
(iii) Analyses using exposure or medical records. (A) Each employee shall, upon request, assure the
access of each employee and designated representative to each analysis using exposure or medical records
concerning the employee's working conditions or workplace.
(B) Whenever access is requested to an analysis which reports the contents of employee medical records
by either direct identifier (name, address, social security number, payroll number, etc.) or by information
which could reasonably be used under the circumstances indirectly to identify specific employees (exact age,
height, weight, race, sex, date of initial employment, job title, etc.), the employer shall assure that personal
identifiers are removed before access is provided. If the employer can demonstrate that removal of personal
identifiers from an analysis is not feasible, access to the personally identifiable portions of the analysis need
not be provided.
(3) OSHA access. (i) Each employer shall, upon request, and without derogation of any rights under the
Constitution or the Occupational Safety and Health Act of 1970, 29 U.S.C. 651 et seq., that the employer
chooses to exercise, assure the prompt access of representatives of the Assistant Secretary of Labor for
Occupational Safety and Health to employee exposure and medical records and to analyses using exposure or
medical records. Rules of agency practice and procedure governing OSHA access to employee medical records
are contained in 29 CFR 1913.10.
(ii) Whenever OSHA seeks access to personally identifiable employee medical information by presenting
to the employer a written access order pursuant to 29 CFR 1913.10(d), the employer shall prominently post a
copy of the written access order and its accompanying cover letter for at least fifteen (15) working days.
(f) Trade secrets. (1) Except as provided in paragraph (f)(2) of this section, nothing in this section
precludes an employer from deleting from records requested by a health professional, employee, or designated
representative any trade secret data which discloses manufacturing processes, or discloses the percentage of a
chemical substance in mixture, as long as the health professional, employee, or designated representative is
notified that information has been deleted. Whenever deletion of trade secret information substantially impairs
evaluation of the place where or the time when exposure to a toxic substance or harmful physical agent
occurred, the employer shall provide alternative information which is sufficient to permit the requesting party
to identify where and when exposure occurred.
(2) The employer may withhold the specific chemical identity, including the chemical name and other
specific identification of a toxic substance from a disclosable record provided that:
(i) The claim that the information withheld is a trade secret can be supported;
(ii) All other available information on the properties and effects of the toxic substance is disclosed;
(iii) The employer informs the requesting party that the specific chemical identity is being withheld as a
trade secret; and
(iv) The specific chemical identity is made available to health professionals, employees and designated
representatives in accordance with the specific applicable provisions of this paragraph.
(3) Where a treating physician or nurse determines that a medical emergency exists and the specific
chemical identity of a toxic substance is necessary for emergency or first-aid treatment, the employer shall

immediately disclose the specific chemical identity of a trade secret chemical to the treating physician or nurse,
regardless of the existence of a written statement of need or a confidentiality agreement. The employer may
require a written statement of need and confidentiality agreement, in accordance with the provisions of
paragraphs (f)(4) and (f)(5), as soon as circumstances permit.
(4) In non-emergency situations, an employer shall, upon request, disclose a specific chemical identity,
otherwise permitted to be withheld under paragraph (f)(2) of this section, to a health professional, employee, or
designated representative if:
(i) The request is in writing;
(ii) The request describes with reasonable detail one or more of the following occupational health needs
for the information:
(A) To assess the hazards of the chemicals to which employees will be exposed;
(B) To conduct or assess sampling of the workplace atmosphere to determine employee exposure levels;
(C) To conduct pre-assignment or periodic medical surveillance of exposed employees;
(D) To provide medical treatment to exposed employees;
(E) To select or assess appropriate personal protective equipment for exposed employees;
(F) To design or assess engineering controls or other protective measures for exposed employees; and
(G) To conduct studies to determine the health effects of exposure.
(iii) The request explains in detail why the disclosure of the specific chemical identity is essential and
that, in lieu thereof, the disclosure of the following information would not enable the health professional,
employee or designated representative to provide the occupational health services described in paragraph
(f)(4)(ii) of this section:
(A) The properties and effects of the chemical;
(B) Measures for controlling workers' exposure to the chemical;
(C) Methods of monitoring and analyzing worker exposure to the chemical; and,
(D) Methods of diagnosing and treating harmful exposures to the chemical;
(iv) The request includes a description of the procedures to be used to maintain the confidentiality of the
disclosed information; and,
(v) The health professional, employee, or designated representative and the employer or contractor of the
services of the health professional or designated representative agree in a written confidentiality agreement that
the health professional, employee or designated representative will not use the trade secret information for any
purpose other than the health need(s) asserted and agree not to release the information under any circumstances
other than to OSHA, as provided in paragraph (f)(7) of this section, except as authorized by the terms of the
agreement or by the employer.

(5) The confidentiality agreement authorized by paragraph (f)(4)(iv) of this section:
(i) May restrict the use of the information to the health purposes indicated in the written statement of
need;
(ii) May provide for appropriate legal remedies in the event of a breach of the agreement, including
stipulation of a reasonable pre-estimate of likely damages; and,
(iii) May not include requirements for the posting of a penalty bond.
(6) Nothing in this section is meant to preclude the parties from pursuing non-contractual remedies to the
extent permitted by law.
(7) If the health professional, employee or designated representative receiving the trade secret
information decides that there is a need to disclose it to OSHA, the employer who provided the information
shall be informed by the health professional prior to, or at the same time as, such disclosure.
(8) If the employer denies a written request for disclosure of a specific chemical identity, the denial must:
(i) Be provided to the health professional, employee or designated representative within thirty days of the
request;
(ii) Be in writing;
(iii) Include evidence to support the claim that the specific chemical identity is a trade secret;
(iv) State the specific reasons why the request is being denied; and,
(v) Explain in detail how alternative information may satisfy the specific medical or occupational health
need without revealing the specific chemical identity.
(9) The health professional, employee, or designated representative whose request for information is
denied under paragraph (f)(4) of this section may refer the request and the written denial of the request to
OSHA for consideration.
(10) When a heath professional employee, or designated representative refers a denial to OSHA under
paragraph (f)(9) of this section, OSHA shall consider the evidence to determine if:
(i) The employer has supported the claim that the specific chemical identity is a trade secret;
(ii) The health professional employee, or designated representative has supported the claim that there is a
medical or occupational health need for the information; and
(iii) The health professional, employee or designated representative has demonstrated adequate means to
protect the confidentiality.
(11)(i) If OSHA determines that the specific chemical identity requested under paragraph (f)(4) of this
section is not a bona fide trade secret, or that it is a trade secret but the requesting health professional,
employee or designated representatives has a legitimate medical or occupational health need for the

information, has executed a written confidentiality agreement, and has shown adequate means for complying
with the terms of such agreement, the employer will be subject to citation by OSHA.
(ii) If an employer demonstrates to OSHA that the execution of a confidentiality agreement would not
provide sufficient protection against the potential harm from the unauthorized disclosure of a trade secret
specific chemical identity, the Assistant Secretary may issue such orders or impose such additional limitations
or conditions upon the disclosure of the requested chemical information as may be appropriate to assure that
the occupational health needs are met without an undue risk of harm to the employer.
(12) Notwithstanding the existence of a trade secret claim, an employer shall, upon request, disclose to
the Assistant Secretary any information which this section requires the employer to make available. Where
there is a trade secret claim, such claim shall be made no later than at the time the information is provided to
the Assistant Secretary so that suitable determinations of trade secret status can be made and the necessary
protections can be implemented.
(13) Nothing in this paragraph shall be construed as requiring the disclosure under any circumstances of
process or percentage of mixture information which is trade secret.
(g) Employee information. (1) Upon an employee's first entering into employment, and at least annually
thereafter, each employer shall inform current employees covered by this section of the following:
(i) The existence, location, and availability of any records covered by this section;
(ii) The person responsible for maintaining and providing access to records; and
(iii) Each employee's rights of access to these records.
(2) Each employer shall keep a copy of this section and its appendices, and make copies readily
available, upon request, to employees. The employer shall also distribute to current employees any
informational materials concerning this section which are made available to the employer by the Assistant
Secretary of Labor for Occupational Safety and Health.
(h) Transfer of records. (1) Whenever an employer is ceasing to do business, the employer shall transfer
all records subject to this section to the successor employer. The successor employer shall receive and maintain
these records.
(2) Whenever an employer is ceasing to do business and there is no successor employer to receive and
maintain the records subject to this standard, the employer shall notify affected current employees of their
rights of access to records at least three (3) months prior to the cessation of the employer's business.
(i) Appendices. The information contained in appendices A and B to this section is not intended, by itself,
to create any additional obligations not otherwise imposed by this section nor detract from any existing
obligation.
APPENDIX A TO §1910.1020—SAMPLE AUTHORIZATION LETTER FOR THE RELEASE OF EMPLOYEE MEDICAL
RECORD INFORMATION TO A DESIGNATED REPRESENTATIVE (NON-MANDATORY)
I, _____ (full name of worker/patient), hereby authorize ______ (individual or organization holding the medical records)
to release to ______ (individual or organization authorized to receive the medical information), the following medical
information from my personal medical records:

(Describe generally the information desired to be released)
I give my permission for this medical information to be used for the following purpose:

but I do not give permission for any other use or re-disclosure of this information.
NOTE: Several extra lines are provided below so that you can place additional restrictions on this authorization letter if you
want to. You may, however, leave these lines blank. On the other hand, you may want to (1) specify a particular expiration date
for this letter (if less than one year); (2) describe medical information to be created in the future that you intend to be covered by
this authorization letter; or (3) describe portions of the medical information in your records which you do not intend to be
released as a result of this letter.)

Full name of Employee or Legal Representative

Signature of Employee or Legal Representative

Date of Signature

APPENDIX B TO §1910.1020—AVAILABILITY OF NIOSH REGISTRY OF TOXIC EFFECTS OF CHEMICAL
SUBSTANCES (RTECS) (NON-MANDATORY)
The final regulation, 29 CFR 1910.20, applies to all employee exposure and medical records, and analyses thereof, of
employees exposed to toxic substances or harmful physical agents (paragraph (b)(2)). The term toxic substance or harmful
physical agent is defined by paragraph (c)(13) to encompass chemical substances, biological agents, and physical stresses for
which there is evidence of harmful health effects. The regulation uses the latest printed edition of the National Institute for
Occupational Safety and Health (NIOSH) Registry of Toxic Effects of Chemical Substances (RTECS) as one of the chief sources
of information as to whether evidence of harmful health effects exists. If a substance is listed in the latest printed RTECS, the
regulation applies to exposure and medical records (and analyses of these records) relevant to employees exposed to the
substance.
It is appropriate to note that the final regulation does not require that employers purchase a copy of RTECS, and many
employers need not consult RTECS to ascertain whether their employee exposure or medical records are subject to the rule.
Employers who do not currently have the latest printed edition of the NIOSH RTECS, however, may desire to obtain a copy. The
RTECS is issued in an annual printed edition as mandated by section 20(a)(6) of the Occupational Safety and Health Act (29
U.S.C. 669(a)(6)).
The Introduction to the 1980 printed edition describes the RTECS as follows:
“The 1980 edition of the Registry of Toxic Effects of Chemical Substances, formerly known as the Toxic Substances list,
is the ninth revision prepared in compliance with the requirements of Section 20(a)(6) of the Occupational Safety and Health Act
of 1970 (Public Law 91-596). The original list was completed on June 28, 1971, and has been updated annually in book format.
Beginning in October 1977, quarterly revisions have been provided in microfiche. This edition of the Registry contains 168,096
listings of chemical substances: 45,156 are names of different chemicals with their associated toxicity data and 122,940 are
synonyms. This edition includes approximately 5,900 new chemical compounds that did not appear in the 1979 Registry. (p. xi)

“The Registry's purposes are many, and it serves a variety of users. It is a single source document for basic toxicity
information and for other data, such as chemical identifiers ad information necessary for the preparation of safety directives and
hazard evaluations for chemical substances. The various types of toxic effects linked to literature citations provide researchers
and occupational health scientists with an introduction to the toxicological literature, making their own review of the toxic
hazards of a given substance easier. By presenting data on the lowest reported doses that produce effects by several routes of
entry in various species, the Registry furnishes valuable information to those responsible for preparing safety data sheets for
chemical substances in the workplace. Chemical and production engineers can use the Registry to identify the hazards which may
be associated with chemical intermediates in the development of final products, and thus can more readily select substitutes or
alternative processes which may be less hazardous. Some organizations, including health agencies and chemical companies, have
included the NIOSH Registry accession numbers with the listing of chemicals in their files to reference toxicity information
associated with those chemicals. By including foreign language chemical names, a start has been made toward providing rapid
identification of substances produced in other countries. (p. xi)
“In this edition of the Registry, the editors intend to identify “all known toxic substances” which may exist in the
environment and to provide pertinent data on the toxic effects from known doses entering an organism by any route described. (p
xi)
“It must be reemphasized that the entry of a substance in the Registry does not automatically mean that it must be avoided.
A listing does mean, however, that the substance has the documented potential of being harmful if misused, and care must be
exercised to prevent tragic consequences. Thus, the Registry lists many substances that are common in everyday life and are in
nearly every household in the United States. One can name a variety of such dangerous substances: prescription and nonprescription drugs; food additives; pesticide concentrates, sprays, and dusts; fungicides; herbicides; paints; glazes, dyes; bleaches
and other household cleaning agents; alkalies; and various solvents and diluents. The list is extensive because chemicals have
become an integral part of our existence.”
The RTECS printed edition may be purchased from the Superintendent of Documents, U.S. Government Printing Office
(GPO), Washington, DC 20402 (202-783-3238).
Some employers may desire to subscribe to the quarterly update to the RTECS which is published in a microfiche edition.
An annual subscription to the quarterly microfiche may be purchased from the GPO (Order the “Microfiche Edition, Registry of
Toxic Effects of Chemical Substances”). Both the printed edition and the microfiche edition of RTECS are available for review at
many university and public libraries throughout the country. The latest RTECS editions may also be examined at the OSHA
Technical Data Center, Room N2439—Rear, United States Department of Labor, 200 Constitution Avenue, NW., Washington,
DC 20210 (202-523-9700), or at any OSHA Regional or Area Office (See, major city telephone directories under United States
Government-Labor Department).
[53 FR 38163, Sept. 29, 1988; 53 FR 49981, Dec. 13, 1988, as amended at 54 FR 24333, June 7, 1989; 55 FR 26431, June 28,
1990; 61 FR 9235, Mar. 7, 1996. Redesignated at 61 FR 31430, June 20, 1996, as amended at 71 FR 16673, Apr. 3, 2006; 76 FR
33608, June 8, 2011]