Automotive sensor encapsulation solution | PUR 1680 provides strong sealing and safety protection

Driven by the wave of intelligence and electrification, automotive sensors have become one of the core components for vehicles to perceive the world. Whether it is millimeter wave radar sensors used in ADAS systems or various sensors that monitor temperature, pressure, and position, stable and reliable operation is directly related to the safety performance of the entire vehicle.However, sensors face multiple challenges during long-term service, such as extreme temperature differences, humid and hot environments, chemical corrosion, and mechanical vibration.BackgroundModern cars are often equipped with dozens of sensors, which are installed in the engine compartment, chassis, inside the headlights, and exposed areas outside the car. These locations not only have harsh environments, but are also difficult to maintain. Once the sensors fail, it may lead to the paralysis of vehicle safety functions.In order to ensure long-term stable operation, encapsulation technology has become an important means of sensor protection – it completely isolates internal precision components from the outside world by injecting specific adhesive materials, making them waterproof, dustproof, vibration proof, and corrosion-resistant. Proximity sensorApplication ChallengeCommon pain points in automotive sensor encapsulation include:Insufficient sealingOrdinary adhesive materials are prone to producing tiny pores during the curing process, making it difficult to achieve a waterproof rating of IP67/IP68.cure shrinkage High shrinkage rate can generate stress after curing, which may damage sensitive chips or solder joints.Flame retardant requirementsAutomotive grade electronic components need to meet UL 94 V-0 flame retardant standards, and ordinary potting adhesives are difficult to balance flame retardancy and mechanical properties.Balance between thermal conductivity and insulationSensor components generate heat during operation, and a low thermal conductivity can lead to poor heat dissipation, while a high thermal conductivity may affect insulation performance. Solution: PUR 1680 polyurethane sealantIn response to the above challenges, we recommend PUR 1680- a flame-retardant polyurethane sealant designed specifically for automotive…