18650 battery insulation paper, also known as an insulator fish paper, is a heat-resistant, adhesive-backed sticker used in DIY battery building. Placed over the positive (or negative) terminal, it prevents the battery's metal casing from short-circuiting against a spot-welded nickel strip or adjacent battery housings.
| Product Name | 18650 Battery Nomex Wrap |
| Material | Nomex Electrical Insulation Paper |
| Type | High Temperature Nomex Paper |
| Thickness | 0.1 - 0.3 mm |
| Dielectric Strength | > 15 kV/mm |
| Operating Temperature | Up to 220°C |
| Tensile Strength | > 80 MPa |
| Color | Yellowish Brown |
| Application | Insulation for 18650 battery cells |