UL-approved Class B Epoxy Mold Compounds for Coil and Bobbin Encapsulation

UL gives all Epoxy Molding Powder Compounds a generic 130°C (Class B) operating temperature rating without testing

Recently, we were asked if we could supply a UL-approved class B Epoxy Mold Compound system as bobbin and encapsulation material. Class B means that the material can be run continuously at temperatures of 130°C.

The short answer to the question is that UL gives all Epoxy Molding Compounds a generic 130°C (Class B) operating temperature rating without testing. This is due to the amount of filler SolEpoxy incorporate into the epoxy. Class F (155°C) and Class H (180°C) ratings however, must be tested by our customers on their devices.

List of UL-Approved products

On the following link, there is a list of all of UL approved compounds under reference QMFZ2_E343402. A copy of this list is kept on our server and can be accessed by clicking on the image.


Please visit us at www.caplinq.com to learn more about our whole range of epoxy mold compounds (EMC) including our semiconductor epoxy molding compounds, our industrial-grade epoxy molding compounds with fiberglass, and our Clear optoelectronic epoxy mold compounds (CMC). If you have any other questions about UL-approvals for epoxy mold compounds, please feel free to leave a comment below or don’t hesitate to contact us.

About Chris Perabo

Chris is an energetic and enthusiastic engineer and entrepreneur. He is always interested in taking highly technical subjects and distilling these to their essence so that even the layman can understand. He loves to get into the technical details of an issue and then understand how it can be useful for specific customers and applications. Chris is currently the Director of Business Development at CAPLINQ.

Leave a Reply

Your email address will not be published. Required fields are marked *