BPC6020 Voice Coil Winding Adhesive

BPC6020 Voice Coil Winding Adhesive:

The BPC6020 is a specialized butyral phenolic cement adhesive, carefully engineered for voice coil winding and laminating in speakers and subwoofers. Because of its two-stage curing process, it ensures excellent handling during assembly while also delivering long-term strength in high-power audio systems.

Two-Stage Curing Process:

• B-Stage (Pre-Cure): First, coat the wire winding with adhesive and then dry it until it becomes tacky and semi-solid. This stage allows easier handling and precise assembly. However, you must not exceed 250°F (121°C) during this step, since higher temperatures can cause premature curing.

• Thermoset Stage (Final Cure): After assembly, heat the coil again between 290–350°F (143–177°C) for 30–40 minutes. At this point, the adhesive fully crosslinks into a thermoset bond, which results in maximum heat resistance and durability.

Key Features of BPC6020 Voice Coil Winding Cement:

• Type: Butyral phenolic cement, high-temp voice coil adhesive

• Viscosity: 2,500–3,500 cps at 25°C

• Adjustable Formula: If the adhesive becomes too thick, you can thin it with MEK (methyl ethyl ketone) for smoother application.

• Engineered Strength: Because it withstands extreme thermal and mechanical stress, it is highly reliable for loudspeaker operation.

• Flexible Application: You may apply it by roller or brush, which allows precise coating of coil windings.

Recommended Application:

1. Apply a thin, even coat to wire windings.

2. Afterward, allow the adhesive to air dry until tack-free.

3. Place the coil in an oven at 250°F for 2 minutes, then let it cool.

4. Next, post cure at 325°F for 30–40 minutes to achieve maximum performance.

5. If needed, re-activate the adhesive with MEK after the initial drying stage.

Storage & Handling:

• Shelf life: 6 months minimum when stored correctly

• Store at 60–80°F (16–27°C) to maintain viscosity stability. While lower temperatures may temporarily increase viscosity, higher temperatures may permanently damage the adhesive.

Safety Warning:

Flammable – Because it contains volatile solvents, it will ignite if exposed to sparks, flames, or heat. Always use in a well-ventilated area during application and until vapors have fully dissipated.