An insulation cotton washer is a precut foam barrier used to isolate the hot and cold sides of a thermoelectric Peltier module.Why Use It

• Blocks Heat: Prevents hot-side exhaust from bleeding back into the cold zone.
• Stops Moisture: Seals the area to prevent condensation and electrical shorts.
• Protects Ceramic: Cushions the fragile Peltier plate against uneven clamping pressure.

Key Specifications

• Size: Usually 64mm x 69mm with a center cutout for standard 40mm x 40mm modules (like TEC1-12706).
• Thickness: 4mm to match standard module profiles.
• Features: High-density thermal foam with a single-sided adhesive backing.

Installation Steps

1. Clean: Wipe heatsinks with isopropyl alcohol.
2. Stick: Peel adhesive and press the washer onto the hot-side heatsink.
3. Paste: Apply thermal grease to both sides of the Peltier module.
4. Insert: Place the Peltier inside the washer cutout.
5. Clamp: Tighten mounting screws slowly in an X-pattern.