Press Releases

Carol Stream, IL — October 9, 2018

Contact: Jamie Li, Product Manager


ITW Formex®  GK Series of flame retardant dielectric insulation material has enjoyed some of the highest UL insulation material safety ratings for decades. For reference, below is the ITW Formex® GK “UL Yellow Card”.


As a result of recent revisions to UL 746A (Standard for Short-term Properties of Polymeric Materials), the criteria for assigning PLC (Performance Level Categories) values for the Hot Wire Ignition (HWI) test has changed. The analysis of the data places greater emphasis on the material’s ability to resist ignition. ITW Formex® GK products have recently been re-evaluated by UL and proven to not ignite during the HWI test. As a result, ITW Formex® GK’s HWI rating has been upgraded to PLC “0”, the highest HWI safety rating. Safety is a top priority for ITW Formex®. We will continue to invest in product safety to meet and exceed industry expectations.


For more information on Formex® GK, please visit our website or contact Jamie Li, Product Manager at




ITW Formex® is part of the ITW Corporation, a Fortune 200 Company with headquarters in Glenview, Illinois and more than 100 independent operating divisions in over 50 countries. Headquartered near Chicago, the ITW Formex division provides technical and sales assistance, distribution, and production globally from multiple locations in the United States and Asia.

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