In instruments such as flow meters, battery powered circuit boards need to work in complex environments for a long time, facing challenges such as moisture, dust, and vibration, and must be effectively sealed and protected. In order to ensure stability, the sealing material not only needs to have excellent protective performance, but also needs to meet the appearance requirements of transparency or semi transparency, and have a certain degree of adhesion with the metal shell.
Core requirements for circuit board encapsulation
The working environment of instrument battery flow meters usually includes:
High humidity – Water vapor may penetrate into the circuit, causing short circuits or corrosion;
Vibration shock – mechanical shock may occur during equipment operation, affecting the stability of solder joints and electronic components;
Outdoor weather resistance – materials must have good weather resistance when exposed to environmental factors such as ultraviolet radiation and temperature changes for a long time;
Electrical insulation protection – prevents circuit board short circuits and improves system safety.
Therefore, the ideal sealing material should have waterproof properties, appropriate adhesive strength, transparency, and excellent weather resistance.
Encapsulation of instrument battery flowmeter circuit board
Recommended product: PUR 1635 A/B transparent light yellow polyurethane sealant
PUR 1635 is a two-component solvent-free polyurethane material that can be cured at room temperature or by heating. After curing, it appears as a light yellow transparent color and is used in two-component sealing, filling, flame retardant and other fields. The raw materials are free of heavy metals, environmentally friendly, and have a wide range of process operability. The finished product has high physical properties and good adhesion to the substrate. Both room temperature and heating curing are available, and it can be deeply cured with low heat release and low shrinkage rate during curing; After curing, it has excellent flexibility and good flame retardant effect.
▶ Excellent low-temperature characteristics and outstanding weather resistance
▶ Excellent flame retardancy, meeting V-0 requirements
▶ Excellent electrical insulation and stability
▶ Good waterproof and moisture-proof properties, with extremely low water absorption rate
▶ Has good adhesion to most metals and plastics
Typical applications
This product is commonly used for sealing electronic capacitors and automotive electronic modules;
Glue sealing of control PCB boards for household appliances such as range hoods, microwave ovens, rice cookers, washing machines, air conditioners, etc;
Moisture and waterproof sealing protection for the circuit boards and magnetic coils of smart toilets, induction toilets, and metal induction trash cans in daily life.
Tags: Flow Meter Circuit Board Encapsulation · Power Supply Encapsulation · Circuit Board Encapsulation
