Typical Applications
  Industrial Motors
  Traction Motors
  Submersible Pump Motors
  DC Field Coils
  Dry-type transformers
  Very high temperature coils and relays
  Encapsulated Coils
  Hermetically sealed relays

Product Description
Thermal Class:   240° (copper)

Extraordinary thermal and chemical stability.

Highest overload resistance, cut thru resistance and operating temperature classification of any Rea film insulation.

Exhibits high resistance to radiation.

Minimum outgassing makes ML ideal for use in hermetically sealed coils and relays.

Chemically compatible with the widest range of solvents, varnishes and encapsulating materials

References Are Provided for Comparative Purposes:

  NEMA: Copper MW 16-C
UL: File # E37683

Square & Rectangular
  NEMA: MW 20-C (Cu)
UL: File # E37683

      Single, Heavy 14 - 31 AWG

      Heavy 2 - 10 AWG

  Rectangular   Copper (Heavy)

      Min Width .162"
  Max Width .575"
  Min Thickness .061"
  Max Thickness .288"


Typical Properties

This data is typical of 18 AWG copper, heavy build insulation only. It is not intended to be used to create specification limits.



Thermal Endurance
20,000 hr Life >240°C

Thermoplastic Flow
min : 450°C
typical : 500+°C

Heat Shock (20% 3x)
½ hr @ 280°C min : no cracks

@ 480°C (900° F) : No

Stress Relief Temp:  200°C


Mandrel Flexibility
After Elongation
    min : 20% 3x OK
    typical : 30% 1x OK
After Snap
    min : 3x OK
    typical : 1x OK

Unilateral Scrape
Avg of 3 sides
    min : 1150 gms
    typical : 1500 gms


Dielectric Breakdown
@ RT : 12 kV
@ 220°C : 7.0 kV

High Voltage DC Continuity
NEMA @ 1500 V DC : 5 faults/100 feet max
Typical @ 3000 V DC : 0-1 faults/100 feet


Resistance to Solvents
after 24 hrs @ RT : Pass
Solvents Including:
50/50 Cellosolve/Xylene,
1% NaOH,
28% Sulfuric Acid,
Freon TMS 

Procedure followed to determine published values:

NEMA: National Electrical Manufacturers Association
JIS: Japanese Industrial Standards
IEC: International Electrotechnical Commission
ASTM: American Society for Testing and Materials

Download pdf Spec Sheet Pyre-ML