Different materials shall be adopted for various positions within charging systems. PUR 1645 is suitable for potting of charging gun housings; PUR 1660 GR can be evaluated for applications requiring low viscosity and extended pot life. EP 1788 is recommended for charging sockets. The SIPA 1850 series is an option for inductors inside charging piles. PUR 1680 or SIPA 1850 can be used for thermally conductive potting of OBC units.
Why Flexibility and Flame Retardancy Are Emphasized for Charging Gun Potting?
Charging guns are continuously subjected to:
- Mating & unmating cycles
- Drop impacts
- Outdoor temperature fluctuations
- Rainwater and humidity
- Harness tension
- Mechanical shocks
Although high-hardness materials deliver strong fixing performance, they tend to generate localized stress upon drop impact.
PUR 1645A/B
Elaplus PUR 1645 is a 100:10 two-component polyurethane potting compound. It features outstanding flexibility after curing and complies with UL94 V-0 flame retardancy standard.
It is therefore ideal for charging gun cavity potting.
PUR 1660 GR
PUR 1660 GR is a 1:1 two-component polyurethane potting compound characterized by low viscosity, long pot life and favorable temperature & weather resistance.
This grade is recommended for evaluation on charging guns with intricate internal structures where full penetration of encapsulant into narrow gaps is required.
Recommended Adhesive for Charging Sockets
EP 1788A/B
EP 1788 is a 100:15 two-component epoxy potting compound with:
- Medium viscosity
- High adhesion strength
- Excellent crack resistance
It is better suited for charging sockets requiring robust mechanical fixation and bulk potting.
Recommended Grade for Charging Pile Inductors
SIPA 1850A/B Series
SIPA 1850 (30#) is designed for charging pile inductor potting with thermal conductivity of approximately 3.0 W/m·K. Additional variants such as SIPA 1850 (20#) offer thermal conductivity around 2.0 W/m·K as specified in the full product datasheet.
Different thermal conductivity grades can be selected according to inductor heat generation, encapsulant thickness and thermal design requirements.
Potting Adhesives for OBC Modules
Recommended options:
PUR 1680A/B Two-Component Polyurethane Potting Compound
100:16 thermally conductive polyurethane encapsulant, medium hardness and high elasticity; thermal conductivity: 0.8～1.2 W/m·K.
SIPA 1850A/B Two-Component Silicone Thermally Conductive Potting Compound
1:1 addition-cure silicone potting material, available in thermal conductivity grades ranging from 0.8 to 4.0 W/m·K.
PUR 1680 can be considered if polyurethane flexibility is preferred; the SIPA 1850 series is the choice for low-stress silicone systems with customizable thermal conductivity.
Material Selection Chart for Charging Systems
| Application Location | Recommended Grade |
|---|---|
| Charging gun cavity | PUR 1645 |
| Charging gun potting requiring long pot life | PUR 1660 GR |
| Charging socket | EP 1788 |
| Charging pile inductor | SIPA 1850 Series |
| Thermally conductive potting for OBC | PUR 1680 / SIPA 1850 |
FAQ — Common Questions about Charging Gun Potting Compounds
Why is polyurethane recommended for charging gun potting?
PUR 1645 provides flexibility together with UL94 V-0 flame retardancy, making it well-matched for gun housing encapsulation where both mechanical impact resistance and safety are critical.
Is higher thermal conductivity always better for OBC potting?
Encapsulant thickness, viscosity, internal stress, weight and actual heat dissipation paths should also be comprehensively evaluated.
Which adhesive applies to microswitches inside charging guns?
Elaplus full solution includes EP 2025 for microswitch bonding and EP 1712 for microswitch potting.
Elaplus | Original Manufacturer • Technical Selection Support • Free Samples
Tel: +86-21-67227200
Email: info@elaplus.cc
Website: www.elaplus.cc
Address: No.555 Jiugong Road, Jinshan Industrial Zone, Shanghai
