Thermal Conductivity & Coefficient of Thermal Expansion (CTE) Epoxy Mold Compounds

Determining Thermal Conductivity and Coefficient of Thermal Expansion (CTE) of Epoxy Mold Compounds

FILLERS ARE THE INGREDIENT THAT MOST AFFECT THE COEFFICIENT OF THERMAL EXPANSION AND THE THERMAL CONDUCTIVITY OF EPOXY MOLDING COMPOUNDS

All mold­ing engi­neers know that the Ther­mal Con­duc­tiv­i­ty (TC) and Coef­fi­cient of Ther­mal Expan­sion (CTE) are impor­tant mate­r­i­al prop­er­ties of Epoxy Mold­ing Com­pounds (EMC). What many of these engi­neers do not real­ize is that is it the fillers in the EMC that play the most crit­i­cal role in how these are ulti­mate­ly deter­mined.

The rea­son the fillers so impor­tant is because they are the largest sin­gle per­cent­age of the ingre­di­ents that make up most epoxy mold com­pounds. This high per­cent­age means that both the CTE and Ther­mal Con­duc­tiv­i­ty of the final mold com­pound are large­ly skewed toward the CTE and TC of the fillers them­selves.

One of the most com­mon fillers in the man­u­fac­ture of EMC is a high puri­ty sil­i­ca.

The Coef­fi­cient of Ther­mal Expan­sion (CTE) of epoxy mold com­pounds (EMC) is con­trolled by a num­ber of fac­tors, most impor­tant of which are the filler prop­er­ties includ­ing:

  • Filler type
  • Filler size
  • Filler per­cent­age (how much is in the resin)

The ther­mal con­duc­tiv­i­ty of an epoxy mold com­pound is deter­mined pri­mar­i­ly also by the filler prop­er­ties includ­ing:

  • Filler type
  • Filler Per­cent­age
  • Filler size

Please vis­it us at www.caplinq.com to learn more about our whole range of mold­ing com­pounds includ­ing our semi­con­duc­tor-grade epoxy mold­ing com­pounds, our fiber­glass-rein­forced indus­tri­al mold­ing com­pounds, and our opti­cal­ly clear epoxy mold com­pounds (CMC). If you have any oth­er ques­tions about B‑stage or shelf-life or 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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