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Electrical Insulating Material Formex™

Flame Retardant Polypropylene Sheet

Product Features

  • UL 94V-0 Flame Class Rating

  • Non-hygroscopic (moisture absorption <0.1%)

  • Excellent dielectric strength

  • Superior score and fold ability

  • Economical

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  Test Method Formex-94BK Formex-125BK
    Order Samples Order Samples
Color   Black Black
Thickness - inch   .094 ± .004 .125 ± .007
Thickness - millimeter   2.38 ± .10 3.18 ± .18
MECHANICAL PROPERTIES Test Method Formex-94BK Formex-125BK
    Order Samples Order Samples
Tensile Yield - psi ASTM D-882    
     Machine Direction   4800 4800
     Transverse Direction   3600 3600
PHYSICAL PROPERTIES Test Method Formex-94BK Formex-125BK
    Order Samples Order Samples
Density - gm/cc ASTM D-792 0.988 0.988
Flammability UL 94 V-0 V-0
Oxygen Index ASTM D-2863 28 28
Water Absorption - % change in weight ASTM D-570 0.01% 0.01%
Heat Deflection Temperature at 66 psi ASTM D-648 106°C/223°F 106°C/223°F
Relative Thermal Index UL 746B    
     Electrical   110°C/230°F 110°C/230°F
     Mechanical Without Impact   110°C/230°F 120°C/248°F
Surface Energy - dynes/cm (as produced) ASTM D-2578 ≥50 ≥50
ELECTRICAL PROPERTIES Test Method Formex-94BK Formex-125BK
    Order Samples Order Samples
Dielectric Breakdown - volts ASTM D-149 56,400 62,500
Dielectric Strength - volts/mil ASTM D-149 600 500
Volume Resistivity - ohm-cm ASTM D-257 146x1015 146x1015
Dielectric Constant ASTM D-150 2.30 2.30
Dissipation Factor ASTM D-150 0.0009 0.0009
High Current Arc Ignition - arcs to ignite UL 746A 200 200
High Voltage Arc Tracking - in/min UL 746A 0.0 0.0
Hot Wire Ignition - seconds UL 746A 30 36
Comparative Tracking Index - volts ASTM D-3638 600 600
PACKAGING INFORMATION Test Method Formex-94BK Formex-125BK
    Order Samples Order Samples
Standard Configuration   Sheet Sheet
Sheet Sizes - inches   24 x 48 24 x 48

Notice: The above information is believed to be accurate and reliable. ITW assumes no responsibility for end use applications and no performance warranty is expressed or implied.

MIL Handbook 454 - Fungus-inert-Group I
FMVSS 302-75: SE
US. Govt. CAGE Code No.: 3VHK9

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