Note: Materials for stocked ‘O’ rings are
printed in red. For specific details please
see Selecting a material on page 6.
Nitrile — acrylonitrile-butadiene (NBR)
Stocked grade: PB80
We have a very wide range of compounds
based on various acrylonitrile/butadiene
ratios. Higher nitrile content generally
gives better hydrocarbon resistance,
whereas lower acrylonitrile content gives
better low temperature flexibility. Our PB
range is suitable for use with mineral oils
— particularly hydraulic types — as well
as water and some solvents. Our Proteus
range is generally suitable for aqueous
food applications, but please consult
our Technical Support Team on specific
applications before ordering.
Chloroprene (CR) — eg, neoprene
These general purpose elastomers
are largely unaffected by sunlight
and atmospheric ageing. They give
satisfactory service in many media, such
as mineral lubricating oils and greases,
dilute acids and alkalis, and some
solvents.
Natural rubber (NR)
Materials based on natural rubber have
high strength and high resilience with
good abrasion resistance. They are
suitable for use with hot and cold water,
ammonia, ethylene glycol, and dilute
acids and alkalis. Limited resistance to
heat, weathering, and oils has reduced
the use of natural rubbers in favour of
synthetic elastomers.
Ethylene-propylene (EPM, EPDM)
Stocked grade: EP18/H/75
These compounds have excellent
resistance to weathering, ozone, hot
and cold water and steam. Grades are
available for use with water up to 180°C,
making them ideal for steam-raising plant.
These materials also display resistance to
aliphatic phosphate-ester hydraulic fluids,
acids, alkalis, salt solutions, alcohols,
glycols and silicone oils.
‘O’ rings in our EP62 range of materials
have been WRAS approved for potable
water applications, with cold and hot wate