In modern automotive electronics, the working environment of sensors is becoming increasingly demanding. Especially in high temperature, high pressure, and high oil immersion application scenarios such as engine compartments and transmission systems, unprecedented challenges have been posed to the reliability of sealing materials.
In this case study, we focus on how to use high-performance epoxy sealant to achieve long-term stable sealing protection and electrical insulation for automotive oil pressure sensors when facing various highly corrosive liquid immersion and extreme temperature difference conditions.
1、 Application Background: Challenging “Oil Sea” Environment
Oil pressure sensors are widely deployed in engine lubrication systems to monitor oil pressure in real-time and ensure safe engine operation. The sensor body needs to be immersed in the following media for a long time:
🔧 Long term soaking of engine oil
🛑 Brake oil DOT3/DOT4 erosion
⚙️ Transmission fluid (such as Castrol BOT790/Shell SL2100)
❄️ Volatile erosion of refrigerant medium
More importantly, the environment in which the sensor is located also faces severe temperature fluctuations, with a temperature range covering all operating conditions from -40 ℃ to 140 ℃, and even requiring the material to withstand long-term thermal aging environments of 150-180 ℃.
If the adhesive performance does not meet the standard, it is highly likely to cause the sealing layer and substrate to peel off, crack, and even lead to internal short circuit failure of the sensor, thereby triggering a vehicle warning or malfunction.
2、 Recommended solution: EP 1710A/B high temperature resistant epoxy sealant
For the above extreme application environments, we recommend using EP 1710 A/B two-component epoxy sealant. Its formula is designed specifically for environments with high temperature resistance, oil resistance, and resistance to refrigerant corrosion, and has the following outstanding properties:
✅ 1. Long term high temperature and thermal shock resistance
Can work at a temperature of 150-180 ℃ for a long time, with stable thermal aging
No cracking or peeling during thermal cycling, protecting the stable operation of core components
✅ 2. Excellent resistance to oil/refrigerant corrosion
Through actual testing and verification, long-term immersion in media such as DOT3, DOT4, BOT790, SL2100, and R134a shows no performance degradation
Colloids do not soften, become sticky, or undergo chemical reactions with oil components
✅ 3. High adhesion and mechanical strength
Can firmly bond various materials such as metal, ceramic, PCB, etc. inside the sensor structure
Anti vibration and anti fatigue, effectively extending the lifespan of sensors
✅ 4. Excellent electrical insulation and waterproof and moisture-proof ability
Low water absorption structure design, IP67/IP68 level encapsulation protection
High volume resistance ensures stable signal transmission
✅ 5. Suitable for batch automated sealing
AB two-component design, compatible with dual liquid glue filling machine, convenient for automated production line operations
Can be cured at room temperature or by heating, flexible to meet different process rhythms
Tags: Pressure Sensor Epoxy Encapsulation · Thermal Conductive Encapsulation Adhesive · Oil Pressure Sensor Encapsulation · Automotive Sensors · Automotive Oil Pressure · Epoxy Encapsulation Adhesive
