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Elastomers
¬ Part 2
¬ Part 3
¬ Part 4
¬ Part 5
¬ Part 6
Vulkollan/PUR
Transformer oil
resist. rubber
|
Properties of elastomers, part 2 of 6
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Properties
of rubber type
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|
Nitrile rubber
NBR
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Neoprene
CR
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Hypalon
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Material designation
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BF, BG, BK, CH
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BC, BE
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CE
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Tensile strength
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non black filled
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6.9
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20.7
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17.2
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carbon black filled
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13.8
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20.7
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20.7
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Hardness range
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40-95
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40-95
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40-95
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Spec. gravity
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1.0
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1.23
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1.12-1.28
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Adhesion to metals
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excellent
|
excellent
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excellent
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Adhesion to fabrics
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good
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excellent
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good
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Tear strength
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moderate
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good
|
moderate
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Abrasion resistance
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good
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excellent
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excellent
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Compression set
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good
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moderate to good
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moderate
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Rebound resilience
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at room temperature
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good
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very good
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moderate to good
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in the warmth
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good
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very good
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good
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Dielectric properties
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slight
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good
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very good to excellent
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Electr. insulating resistance
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slight
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moderate to good
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good
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Gas permeability
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low
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low
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low to very low
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Resistance to acids
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diluted
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good
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excellent
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excellent
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concentrated
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good
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good
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very good
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Resistance to solvents
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aliphatic hydrocarbons
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excellent
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moderate to good
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moderate to good
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aromatic hydrocarbons
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good
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moderate
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moderate
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oxygenous solvents
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slight
|
slight
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slight to moderate
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paint solvents
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moderate
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slight
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slight
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Resistance to:
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lubricating oils
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very good
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good
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good to excellent
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mineral oil and fuels
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excellent
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good
|
good
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animal and vegetable oils
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very good
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good
|
good
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water absorption
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good
|
good
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very good
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oxidation
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good
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very good to excellent
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excellent
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ozone
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moderate
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very good to excellent
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outstanding
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sunlight
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slight
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very good
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outstanding
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thermal ageing
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115° C
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95° C
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135° C
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effects of flames
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slight
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good
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good
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high temperatures
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good
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very good
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excellent
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exposure to cold
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moderate to good
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good
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good
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