OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. seq. This rule was remanded by the U.S. Circuit Court of Appeals and the limits are not currently in force.

CAS: None. Chemical Formula: None

The Agency proposed a PEL of 5 mg/m3 (the TLV established by the ACGIH) for total fibrous glass. NIOSH (1977d/Ex. 1-261) has recommended that employee exposures to fibrous glass dust not exceed 5 mg/m3 as an 8-hour TWA (as total dust) or 3 fiber/cc for fibers greater than 10 um long.

Extensive evidence was submitted to the record regarding the proposed PEL for fibrous glass. Because of the conflicting nature of some of the evidence and the complexity of the issues raised, OSHA has not yet been able to reach a final conclusion. Therefore, OSHA is temporarily delaying a final decision regarding the establishment of a separate PEL for fibrous glass; however, OSHA will make this final decision within a reasonable period of time.

Page last reviewed: September 28, 2011