29 CFR 1910.1450: OSHA Laboratory Standard (Chemical Hygiene Plan)

Regulatory citation: 29 CFR 1910.1450, Occupational Exposure to Hazardous Chemicals in Laboratories

What Is the OSHA Laboratory Standard?

Section 1910.1450 applies to employers engaged in the laboratory use of hazardous chemicals. Its central requirement is a written Chemical Hygiene Plan. Where it applies, it generally takes the place of the other OSHA chemical-specific health standards in Subpart Z.

Laboratory use has four parts. Chemicals are handled on a laboratory scale, meaning containers one person can handle easily and safely. Multiple chemical procedures or chemicals are used. The work is not part of, or simulating, a production process. Protective lab practices and equipment are in common use. Work that does not meet this definition falls under the regular standards, even inside a lab building.

Why the Laboratory Standard Matters

Labs use many chemicals in small amounts that change often. Exposure limits still apply, but control depends on procedures, fume hoods and trained people rather than fixed process controls.

Core Obligations

1. Keep Exposure Below the PELs (1910.1450(a) and (c))

Lab employees' exposure to OSHA-regulated substances must not exceed the permissible exposure limits in Subpart Z. Some parts of the substance-specific standards still apply in labs. These include prohibitions on eye and skin contact, and the monitoring and medical surveillance rules where exposure routinely exceeds the action level or PEL.

2. Determine Exposure When There Is Reason To (1910.1450(d))

Initial monitoring is required if there is reason to believe exposure to a regulated substance routinely exceeds the action level, or the PEL where there is no action level. If it does, the employer must follow the monitoring rules in the relevant standard. Employees must be told the results in writing within 15 working days after the employer receives them, individually or by posting.

3. Write and Follow a Chemical Hygiene Plan (1910.1450(e))

The written plan must protect employees from hazardous chemicals in the lab and keep exposure below the limits. It must include standard operating procedures, criteria for choosing controls such as engineering controls, PPE and hygiene practices, and measures to make sure fume hoods and other protective equipment work properly. It must also cover training, activities that need prior approval, medical consultation, and who is responsible, including a Chemical Hygiene Officer.

4. Protect Against Particularly Hazardous Substances (1910.1450(e)(3)(viii))

The plan must add protections for select carcinogens, reproductive toxins and substances with a high degree of acute toxicity. Measures include a designated area, containment devices such as fume hoods, procedures for safe waste removal and decontamination procedures.

5. Review the Plan Annually (1910.1450(e))

The employer must review and evaluate the plan's effectiveness at least annually and update it as needed. The plan must be readily available to employees and their representatives.

6. Inform and Train Employees (1910.1450(f))

Information and training must be given at initial assignment to a work area with hazardous chemicals and before new exposure situations. The employer decides how often refresher training happens. Employees must learn the standard, where the plan and reference materials such as safety data sheets are kept, exposure limits, signs and symptoms of exposure, how to detect releases, and the protective measures in place.

7. Provide Medical Consultation (1910.1450(g))

Employees must have the chance to get medical attention if they develop signs or symptoms linked to a lab chemical, if monitoring routinely shows exposure above the action level or PEL for a substance with medical surveillance rules, or after a spill, leak or explosion likely to cause exposure. Exams are provided by or under a licensed physician, at no cost and without loss of pay.

8. Handle Labels, Lab-Made Chemicals and Records (1910.1450(h) to (j))

Labels on incoming containers must not be removed or defaced, and safety data sheets must be kept and readily accessible. A chemical made in the lab with an unknown composition must be assumed hazardous. Where respirators are needed, they must be provided at no cost under 29 CFR 1910.134. Exposure and medical records must be kept and made available under OSHA's records access rules.

Common Compliance Approaches

Keep the Plan Practical

Write SOPs by procedure or chemical class so researchers can find what applies to their bench, rather than one general document.

Test Hoods on a Schedule

Set a regular fume hood check and label each hood with its last test date, so the plan's equipment checks are visible.

Example: A Chemical Hygiene Plan in Practice

A university chemistry department appoints a Chemical Hygiene Officer and writes a plan with SOPs for each research group. Work with a select carcinogen is limited to a marked designated area inside a fume hood, with a written decontamination step. New graduate students complete training before starting lab work. After a small spill of a toxic solvent, an exposed student is offered a medical consultation, and the officer reviews the SOP during the annual plan review.

Related regulations: OSHA Hazard Communication, OSHA access to exposure and medical records, OSHA formaldehyde standard.

Note: This summary covers federal OSHA requirements. State plan states may set stricter rules.

Frequently Asked Questions

Does the Laboratory Standard apply to quality control labs?

Only if the work meets the definition of laboratory use. Work that is part of or simulates a production process is covered by the regular OSHA standards instead.

Is a Chemical Hygiene Officer required?

Yes. The plan must assign responsibility for carrying it out, including a designated Chemical Hygiene Officer and, where appropriate, a chemical hygiene committee.

Does HazCom still apply in labs?

Partly. Labs must keep labels on incoming containers and keep safety data sheets accessible. Chemicals the lab makes for users outside the lab must meet the Hazard Communication Standard.