Formex® (Flame Retardant Polypropylene)

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Formex® Characteristics

Formex® is a cost-effective electrical insulator and barrier. It can be die cut, heat formed, thermoformed and machined. Formex® can be folded repeatedly without cracking or splitting. It can also be scored and folded to fabricate 3-D parts.

This flame-retardant polypropylene thermoplastic material offers superior dielectric strength and chemical resistance. It has a UL 94V-O flame class rating and can withstand continuous use temperatures up to 239 degrees Fahrenheit. Characteristics include:

  • Get a QuoteExcellent dielectric strength
  • UL 94V-O flame class rating
  • Superior score and folding ability
  • Economical

Applications for Formex®

  • Electrical insulation
  • Barriers
  • Electrical switch gear
  • Air flow components

Contact a Dielectric Manufacturing knowledge expert to discuss the use of Formex for electrical insulation for your application. Call 800-367-9122 or email

We also are a distributor of Formex. Contact us to discuss how we can fulfill your Formex material needs.

Formex Polypropylene Material Properties

Density982 - 1.16e3kg/m^30.0355 - 0.0418lb/ft^3
Yield Strength2.37e7 - 3.15e7Pa3.44 - 4.57ksi
Tensile Strength2.1e7 - 2.3e7Pa3.04 - 3.33ksi
Elongation0.258 - 0.705% strain25.8 - 70.5% strain
Hardness (Vickers)7.85e7 - 8.24e7Pa8 - 8.41HV
Impact Strength (unnotched)1.81e4 - 4.04e4J/m^28.62 - 19.2ft.lbf/in^2
Fracture Toughness1.41e6 - 1.48e6Pa/m^0.51.28 - 1.134ksi/in^0.5
Young's Modulus1.5e9 - 2.08e9Pa0.218 - 0.30210^6 psi
Max Service Temperature80.6 - 103°C177 - 218°F
Melting Temperature161 - 170°C322 - 338°F
Insulator or ConductorInsulatorInsulator
Specific Heat Capability1.67e3 - 1.71e3J/kg °C0.399 - 0.407BTU/lb. °F
Thermal Expansion Coefficient5.6e-5 - 6.42e-5strain/°C31.1 - 35.7µstrain/°F
CO2 Footprint3.43 - 3.79kg/kg3.43 - 3.79lb/lb

Dielectric Manufacturing, Richfield, Wisconsin USA

Formex Material Properties Provided By Dielectric Manufacturing, Richfield, Wisconsin