Nomex insulation paper

DuPont Nomex Insulating Paper is an aramid paper calendered at high temperature, combining high dielectric strength with Class H thermal performance. The material retains its mechanical and electrical properties through years of continuous operation at elevated temperatures, making it a widely used standard in the manufacture and rewinding of motors and dry-type transformers.

Typical Applications

• Slot liners, slot wedges and phase insulation in electric motors
• Layer and end-turn insulation in dry-type and cast resin transformers
• Insulating sleeves and washers in generators and reactors
• Insulating liners for battery packs, busbars and electrical panels
• Winding insulation for traction motors, compressors and household appliances

Why Choose It

1. Class H thermal rating, extending equipment life and rated power
2. Flexible and easy to fold and slot-form without cracking
3. Self-extinguishing, does not melt or drip when burning
4. Highly compatible with impregnating varnishes, epoxy resins and insulating oils

Key Specifications

Application Notes

Aramid paper absorbs moisture from the air, which can reduce dielectric strength; for high-voltage equipment, dry at 105–120 °C before varnish impregnation. When folding edges or forming slots, use tooling with a bend radius suited to the paper thickness. Store rolls or sheets flat and avoid heavy loads that could cause deformation.

For motor rewinding, 0.18–0.25 mm paper in medium-sized stator slots usually offers a good balance between dielectric strength and slot fill.

Contact the technical team at AMS Vietnam for advice on thickness, slitting to width and pricing for motor rewinding shops.