Coils are encapsulated to assist in:
- Protection against environment, moisture, and external fluids
- Protection against material handling errors- damage magnet wire
- Providing a mating connector
- General aesthetics
Classic Coil will assist in the overmold decisions that match your product's operating environment and UL requirements.
Coils can be encapsulated with:
- Engineered Thermoplastic Material
- Thermoset Epoxy material
- Liquid Epoxy
Engineered Thermoplastic;
- Manufacturers (DuPont, Phillips) offer large database of material compatibility
- Rynite, Ryton, Zenite, specialized moisture resistant Polypropylene
- Higher tooling compared to thermoset mold but lower labor cost per coil
Thermoset Epoxy Material:
- A more gentle process for fine wire coils
(>38 AWG)
- Injection pressure is approximate 400 PSI compared to maybe 3000 PSI for thermoplastic
- Molding temperatures for thermoset maybe 300 F compared to 550F on thermoplastic
- Lower tooling but higher labor cost
- 3-4 times higher heat shedding rate than most thermoplastics
Quality
Assurance 