How to Select Adhesives for PTC Heaters? Recommended Grades for Housing Sealing, Power‑Module Thermal Conduction and Connector Potting

Multiple single‑material solutions shall be avoided for adhesives used in new‑energy‑vehicle PTC heaters. Material selection shall be carried out respectively for housing sealing, power‑module heat dissipation and local connector potting. For PTC heater applications, Elaplus recommends SIPA 1865‑2K for housing sealing, TCMP 1960‑2K for power‑module heat dissipation, and SIPA 3015‑2K for connector‑section potting, delivering a combined solution of “sealing + thermal conduction + insulation protection”. Adhesive Solution for PTC Heaters Why Multiple Types of Adhesives Are Required for PTC Heaters A new‑energy‑vehicle PTC heater integrates heating elements, power devices, control circuits, connectors and metal housings. Different positions face distinct challenges: Therefore, adopting one single high‑thermal‑conductivity adhesive or one single sealing adhesive for all positions hardly meets all functional requirements simultaneously. Recommended Grade for PTC Housing Sealing Elaplus SIPA 1865‑2K Within Elaplus PTC application solutions, SIPA 1865‑2K is mainly applied for housing sealing. Housing Sealing Main functions: For PTC housing‑sealing materials, initial bonding strength is not the only indicator. Interface delamination and sealing failure after thermal cycling shall be verified as key evaluation items. Recommended Grade for PTC Power‑Module Heat Dissipation Elaplus TCMP 1960‑2K Thermal Gel TCMP 1960‑2K is designated for heat dissipation of PTC power modules. Its core function is not rigidly bonding the power module in place, but filling the interface between power devices and heat‑dissipation structures to transfer heat efficiently to the metal housing. Key selection criteria:‑ Thermal conductivity‑ Interface gap‑filling capability‑ Material hardness‑ Assembly tolerance‑ Thermal‑cycling stability For power devices in particular, excessively hard thermal‑interface materials that introduce high assembly stress onto components shall be avoided. Recommended Grade for PTC Connector‑Section Potting Elaplus SIPA 3015‑2K SIPA 3015‑2K is used for potting of internal PTC connectors to provide local insulation, moisture resistance and fixation. Suitable for protection of:‑ Connector roots‑ Peripheral terminals‑ Local circuits‑ Electrical connection points PTC…