Hexavalent Chromium Standard

ORIGIN: Moldex Technical Services Department


Final Standard On Cr(VI)

  • OSHA has established three separate standards for Cr(VI) exposure in general industry (29 CFR 1910.1026), shipbuilding (26 CFR 1915.1026), and construction (26 CFR 1926.1126).
  • The OSHA permissible exposure limit (PEL) for all three sectors was lowered from 52 to 5 micrograms (µg) of Cr(VI) per cubic meter of air as an 8-hour time-weighted average (TWA).

Key Points

These three standards provide provisions for

  • Exposure determination
  • Methods of compliance
  • Respiratory protection
  • Protective work clothing and equipment
  • Hygiene areas and practices
  • Medical surveillance
  • Communication of Cr(VI) hazards to employees
  • Recordkeeping
  • Compliance dates
  • Regulated areas and housekeeping (general industry only)

The exposure of Cr(VI) in the painting of aircraft or large aircraft parts shall be kept at 25 µg per cubic meter or below. The use of engineering controls and work practice controls may be supplemented with respiratory protection to reduce the exposure to the PEL is recommended.

Areas outside the scope of the standard for all three standards:

  • Exposures that occur in the application of pesticides regulated by the EPA or another Federal government agency (e.g., the treatment of wood with preservatives)
  • Exposures to portland cement
  • Where the employer has objective data demonstrating that exposure is below 0.5 µg per cubic meter as an 8-hour TWA under any expected conditions of use

The employer shall not rotate employees to different jobs to achieve compliance with PEL, which has been allowed in previous OSHA health standards such as formaldehyde and lead.
The rules and provisions for general industry, construction, and shipbuilding are similar, despite the need for three standards.

Compliance With Respiratory Protection

According to the standard, respiratory protection shall be provided by the employer for employees during:

  • Periods necessary to install or implement engineering and work practice controls
  • Work operations for which engineering and work practice controls are not feasible
  • Work operations for which an employer has implemented all feasible engineering and work practice controls and such controls are not sufficient to reduce exposures to or below the PEL
  • Work operations where employees are exposed above the PEL for fewer than 30 days per year, and the employer has elected not to implement engineering controls
  • Emergencies

When respirator use is required, the employer shall institute a respiratory protection program in accordance with 29 CFR 1910.134.

Moldex® Solutions

  • Moldex® offers a complete line of disposable and half mask respirators (N95, R95, N100, and P100) for protection from Cr(VI) (up to 10x the PEL or 50 µg per cubic meter as an 8-hour TWA).
  • Moldex® can also assist you with setting up a respiratory protection program in accordance with 29 CFR 1910.134, which covers many of the additional provisions mentioned above in the “Key Points.”
  • Respirators are especially important in the aerospace industry, which is not required to engineer the exposure level to the PEL or below. They may use respirators to get below the PEL instead.

Most Likely Environments For Exposure To Cr(VI)

  • Welding on stainless steel or Cr(VI) painted surfaces
  • Chemical industry [Cr(VI) is used as a catalyst in pigments, metal plating, and chemical synthesis]
  • Electroplating
  • Other surface coating processes
  • Manufacture of stainless steel
  • Shipyards
  • Construction
  • Other general industry
  • Aerospace painting operations

If you should have any questions on any of these issues, please contact the Technical Service Department at 800-421-0668 x 512/550.

Additional Information

Hexavalent Chromium
OSHA Trade News Release
OSHA Small Entity PDF

WARNING: The information contained in this Tech Brief is dated and was accurate to the best of Moldex’s knowledge, on the date above. It is not meant to be comprehensive, nor is it intended to be used in place of the warning/use instructions that accompany Moldex respirators. Outside of the USA, check with all applicable and local government regulations.

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