Standard Interpretations - Table of Contents
• Standard Number: 1910.1001; 1926.1101


OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov.


September 6, 1990

MEMORANDUM FOR: REGIONAL ADMINISTRATORS

ATTN: ARA'S FOR TECHNICAL SUPPORT

THRU: LEO CAREY
Office of Field Programs

FROM: THOMAS J. SHEPICH, Director
[Directorate of Science, Technology, and Medicine]

SUBJECT: High-Efficiency Particulate Air (HEPA) Filters For Vacuum Cleaning Equipment


We have recently received inquiries regarding "cold" DOP (dioctyl or di-2-ethylhexyl phthalate) aerosol, generated at ambient temperature, and whether it can be used to test vacuum cleaner HEPA filters to meet the requirements as specified in the OSHA asbestos standards 29 CFR 1910.1001 and [29 CFR 1926.1101].

The HEPA filter test method, commonly employed by the nuclear industry and the military, uses a thermally generated monodisperse DOP aerosol