——Thermal conductivity, flame retardancy, IP68 comprehensive protection
In electric tools such as drills, hammers, angle grinders, impact wrenches, etc., the controller is equivalent to the “brain” of the entire machine.
It works in a complex environment with high current, high temperature rise, strong vibration, dust, and water vapor coexistence for a long time. Once the sealing material is selected improperly, it is prone to:
Excessive temperature rise, power device failure
Moisture intrusion can cause short circuits and corrosion
Long term vibration leads to cracking of solder joints and detachment of components
Insufficient flame retardant rating poses safety hazards
Therefore, controller encapsulation is not just about “filling it up”, but requires systematic requirements for material performance and reliability.
1、 The core challenge of sealing electric tool controllers
one ️⃣ Both heat dissipation and insulation must be taken into account
The power MOS, IGBT, and drive module continue to generate heat, requiring effective thermal conductivity of the potting material while maintaining excellent electrical insulation to avoid leakage risks.
2. ️⃣ The flame retardant level is directly related to safety
Electric tools belong to high-power equipment, and the sealing material must meet the UL 94 V-0 flame retardant rating, which does not support combustion or drip under abnormal working conditions.
3 ️⃣ High waterproof and moisture-proof requirements
In outdoor or construction site usage scenarios, rainwater, condensate, and dust are everywhere. The controller needs to achieve IP68 protection, and the sealing material must have low water absorption and long-term stability.
4 ️⃣ Complex structure with high requirements for process friendliness
The internal components of the controller are dense and have many gaps. The sealing adhesive needs to have low viscosity, good fluidity, and a wide operating window to ensure complete coverage and no gaps.
2、 Recommended solutions
PUR 1627 thermal conductive flame-retardant polyurethane sealant
PUR 1627 provides a highly balanced solution between performance and process to address the aforementioned challenges of power tool controllers.
Sealing of electric tools
Low viscosity, strong operability
Excellent low-temperature characteristics and outstanding weather resistance
Excellent electrical insulation and stability stability
Good waterproof and moisture-proof properties, with extremely low water absorption rate
Has good adhesion to most metals and plastics
Typical application scenarios
Integrated sealing of drill/hammer controller
Angle grinder, cutting machine power control module
Brushless motor drive controller
Outdoor and industrial grade electric tool electronic modules
View PUR 1627 details
PUR 1627 is a product specifically designed for potting electric tool controllers
👉 Thermal conductive+flame retardant+high reliability polyurethane sealant
It not only solves key issues such as heat dissipation, insulation, waterproofing, and flame retardancy, but also meets the requirements of the production end for operability and stability, helping power tools achieve longer lifespan and higher safety in more demanding environments.
Tags: IP68 potting Solution · PUR 1627 · Thermal Conductive Flame Retardant potting compound · Controller Waterproof potting · Electric Tool Controller potting Adhesive · Polyurethane potting Adhesive
