Datasheet updated

2024-01-11 10:32
(supersedes all previous editions)

PAC-240 is a film insulation made of polyimide resins. It is a Class 240°C (465°F) thermal rated insulation with exceptional resistance to chemical solvents and burnout. The outstanding thermoplastic flow of over 400°C (750°F) and its ability to withstand excessive overloads extends the use of magnet wire in extreme conditions. ML is unaffected by prolonged exposure to varnish solvents and its compatible with virtually all systems.

Applied in the form of a polyamic acid solution, it is converted with heat to a continuous film with excellent resistance to radiation, chemicals and cryogenic temperatures. PAC-240 meets the requirements of NEMA MW 16 and listed with Underwriters Laboratories

Typical applications are within fractional and integral horsepower motors, high temperature continuous duty coils and relays, hermetic and sealed units, heavy duty hand tool motors, encapsulated coils, speaker voice coils.

Electrical properties

Property NEMA MW-1000 ASTM D1696 IEC 851 JIS 3003
Dielectric strength at 25°C (77°F) 69-75 13-4.2, 3, 4 11.1 11.1 kV
Dissipation factor at 220°C (428°F) - 1 kHz 107-114 0.08

Mechanical properties

Property NEMA MW-1000 ASTM D 1696 IEC 851 JIS C 3003
Adhesion and flexibility
no snap
20% snap



Cut-through temperature 61-68 >500°C (932°F)
Heat shock
20% stretch - ½ h at 260°C (500°F)




Pass 3d
Scrape resistance 170-177 11-6.1 10.2 1275g

Physical properties

Thermal endurance above 240°C (464°F)
Hours at temperature 20000 10000 5000 1000
Temperature °C (°F) 242 (468) 270 (518) 280 (536) 315 (599)

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.