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.
Background
Modern 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 sensor
Application Challenge
Common pain points in automotive sensor encapsulation include:
Insufficient sealing
Ordinary 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 requirements
Automotive 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 insulation
Sensor 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 sealant
In response to the above challenges, we recommend PUR 1680- a flame-retardant polyurethane sealant designed specifically for automotive sensors that balances sealing, protection, and thermal management performance.
Automotive sensor encapsulation
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Core advantages
Super sealing: Excellent fluidity and wettability, forming a dense protective layer after curing, easily achieving IP68 protection level.
Low shrinkage rate: The curing process has minimal shrinkage, reducing stress concentration and protecting sensitive electronic components.
Flame retardant V-0 level: Complies with UL 94 V-0 standard, enhancing the overall safety level of the machine.
Thermal conductivity of 0.6~0.8 W/m · K: effectively dissipate the working heat of the sensor and avoid temperature rise affecting performance.
Excellent weather resistance: Long term tolerance to -50 ℃~130 ℃, suitable for extreme working conditions such as engine compartment and chassis.
Typical applications
Sensor encapsulation
wheel speed sensor
Tire Pressure Monitoring (TPMS)
Millimeter wave radar module
Temperature/pressure/position sensor
Vehicle light environment monitoring sensor
Today, with the continuous improvement of automotive electronic reliability standards, PUR 1680 provides comprehensive protection for automotive sensors with its excellent sealing, low shrinkage, flame retardancy, and thermal conductivity, allowing critical data acquisition equipment to operate stably in extreme environments and safeguarding driving safety.
Tags: Sensor Encapsulation · Sensor Encapsulation Adhesive · Thermal Conductive Encapsulation Adhesive · Automotive Sensor Encapsulation Adhesive · Polyurethane Encapsulation Adhesive
