FIRSTFLEX SPECIAL NBR ELASTOMER INSULATION AND SHEATHING

Many Firstflex cables use a special insulation and sheathing system which is an exclusive blend of Acrylo-Nitrile Butadiene Rubber (NBR).This special insulation ensures excellent dielectric strength.

The special insulation permits continuous temperatures up to 90°C without any property loss so that you may use smaller cross sectional Special NBR cables than either 60°C rubber or 75°C PVC insulated cables.

Firstflex Special NBR combines exceptional toughness and durability with outstanding flexibility, and remarkable resistance to oil, heat, abrasion, ozone and most solvents and is UV stabilised.

Firstflex Special NBR does not support combustion and conforms to or exceeds most International Standards.

PROPERTIES OF FIRSTFLEX SPECIAL NBR VS. DIFFERENT STANDARD' REQUIREMENTS

Property Under Test Unit BS 638
Part 4: 1970
AS 3191/3116 IEC 245/6/1980
VDE 0250
Firstflex
Special NBR
MECHANICAL PROPERTIES
1. AS DELIVERED
Tensile strength   Kg/cm² 110 70 120 166
Elongation at break min. % 250 250 300 500
2. AFTER AGEING – 10 X 24 HOURS AT 90°C
Tensile Strength min. Not specified Not specified Not specified Not specified 156
Percentage of value for unaged sample min. % 85 50 85 94
Elongation at break min. % 200 Not specified Not specified 475
Percentage of value for unaged sample min. % 75 50 75 95
3. OIL RESISTANCE – AFTER IMMERSION FOR 24 HOURS IN MINERAL OIL AT 100°C
Tensile Strength min. Not specified Not specified Not specified Not specified 151
Percentage of value for unaged sample min. % 60 60 60 90
Elongation at break min. % Not specified Not specified Not specified 360
Percentage of value for unaged sample min. % 60 60 60 72
PERMISSIBLE OPERATING TEMPERATURE
Maximum conductor temp.   °C 90 - 60 90
Minimum ambient temp.   °C Not specified Not specified Not specified -40
SURFACE RESISTANCE AT 20°C
      Not specified Not specified 10 x 109 4.6 x 1012
FLAME RETARDANT – FLAME NOT TO PROCEED MORE THAN
    mm - - 250 Self extinguishing

 

Firstflex has taken every precaution to ensure accurate information in this catalogue but accept no liability for any errors or omissions. Firstflex reserves the right to modify specifications at any time.