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.

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