NIOSH Respiratory Protective Device Information

Subject: Effective Immediately: Voluntary Rescission of RB Sigma, LLC Approval

NIOSH CA 2023-1051
March 2023


The National Institute for Occupational Safety and Health (NIOSH) has honored a request by RB Sigma, LLC to voluntarily rescind the NIOSH respirator approval issued to RB Sigma, LLC 

As of February 15, 2023, any respirator marked with a NIOSH approval label with approval number TC-84A-9419 is no longer NIOSH approved. The NIOSH Certified Equipment List no longer includes this approval number.

Due to the voluntary rescission of this NIOSH approval, respirators bearing this NIOSH approval number may no longer be used, manufactured, assembled, sold, or distributed.

Please reach out to RB Sigma, LLC for additional details related to their decision to voluntarily rescind the approval issued to RB Sigma, LLC identified in this notice. The Certified Equipment List can be used to locate other NIOSH Approved® respirators.

NIOSH Approved is a certification mark of the U.S. Department of Health and Human Services (HHS) registered in the United States and several international jurisdictions.