CEM-1

Electronics – Laminates for the electronics industry

CEM-1

CEM-1 is a composite epoxy material consisting of a cellulose paper core sandwiched between glass fibre layers, with epoxy resin. This special structure improves the material’s tensile strength. Its electrical properties are almost on the FR-4 level. Therefore, it is often used in applications in which a grade of FR-3 is insufficient but FR-4 quality is not required.

Physical properties
  Value Unit Test method
Specific gravity g/cm3 DIN EN ISO 1183
Average molecular mass 106 g/mol
Water absorption, 24/96 h (23 °C) % DIN EN ISO 62
Weather-resistance
Combustibility UL 94 DIN EN ISO 527-2
Food safety
Mechanical properties
  Value Unit Test method
Modulus of elasticity MPa DIN EN ISO 527-2
Tensile strength MPa DIN EN ISO 527-2
Elongation at break % DIN EN ISO 527-2
Tensile strength at break % DIN EN ISO 527-2
Flexural modulus MPa DIN EN ISO 178
Flexural strength MPa DIN EN ISO 178
Compressive modulus MPa EN ISO 604
Compressive strength, 1%/2% MPa EN ISO 604
Impact strength (Charpy) kJ/m2 DIN EN ISO 179-1eU
Notch impact strength (Charpy) kJ/m2 DIN EN ISO 179-1eA
Notch impact strength (Izod) kJ/m2 DIN EN ISO 180/2A
Toughness (ball pressure) MPa ISO 2039-1
Toughness (Shore D) Sh D DIN EN ISO 868
Wear-resistance % Sand-Slurry
Coefficient of friction (against steel) μ
Thermal properties
  Value Unit Test method
Glass-transition temperature °C DIN 53765
Melting point °C DIN 53765
Operating temperature (instantaneous) °C
Operating temperature (continuous) °C
Operating temperature (minimum) °C
Thermal expansion coefficient, 23–60 °C 10-5 K-1 DIN EN ISO 11359-1;2
Thermal expansion coefficient, 23–100 °C 10-5 K-1 DIN EN ISO 11359-1;2
Specific heat capacity J/(g×K) ISO 22007-4:2008
Thermal conductivity W/(m×K) ISO 22007-4:2008
Electrical properties
  Value Unit Test method
Surface resistivity DIN IEC 60093
Resistivity Ω×cm DIN IEC 60093
Dielectric strength kV/mm DIN EN 60243-1
CTI value V DIN EN 60112
Optical properties
  Value Unit Test method
Light transmittance
Refractive index
Optical errors DIN 52305/AS
Abrasion-resistance, 100 rotations with 500 g % haze ANSI Z26.1

Additional downloads

Delivery selection sheets
Specific gravity g/cm3
Service temperature … °C
Price category €€ (€8–25/kg)

Special properties

  • good mechanical properties
  • low water absorption
  • fire rating of UL 94 V-0
  • none of the hazardous substances specified in the RoHS directive

Applications

bed-of-nails testers, jigs for the electronics industry

Standard colours

white

Premade pieces

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