Call for Public Comments: New OARS-WEEL

Posted October 22, 2014

Toxicology Excellence for Risk Assessment (TERA) is now accepting public comments on the OARS-WEEL for the chemical cis 1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz-Z). According to TERA, HFO-1336mzz-Z is a foam-blowing agent, refrigerant, fire extinguishant, and solvent. The recommended WEEL value for HFO-1336mzz-Z is 500 ppm (3,350 mg/m3) as an 8-hour time-weighted average.

Comments are due no later than Tuesday, Nov. 4. More information on the comment process, including a PDF of the WEEL, is available on TERA’s website.

The AIHA® Guideline Foundation's Workplace Environmental Exposure Levels® (WEELs) development process was transferred to TERA under the Occupational Alliance for Risk Science (OARS) initiative in July 2013. WEELs are airborne concentration limits that provide guidance for protecting most workers from adverse health effects related to occupational chemical exposures. The table of WEEL values is available on TERA’s website and on