A composition comprising by weight:
- 70 to 96% of at least one polyamide chosen from PA-11, PA-12, aliphatic
polyamides resulting from the condensation of an aliphatic diamine having from
6 to 12 carbon atoms and an aliphatic diacid having from 9 to 12 carbon atoms,
and 11/12 copolyamides having either more than 90% of nylon-11 units or more than
90% of nylon-12 units;
- 4 to 10% of a plasticizer;
- 0 to 25% of an NBR or H-NBR elastomer; and
- the sum of the amount of plasticizer and the amount of elastomer is
between 4 and 30%;
can be manufactured by melt-blending the various constituents using standard
techniques for thermoplastics. The composition is particularly useful for pipes
used in the operation of offshore oil and gas fields. They exhibit very good ageing
resistance. They are also useful for simpler pipes in motor vehicles, these compositions
withstanding the ageing caused by the temperature under the bonnet of motor vehicles
and the nature of the fluids transported. Pipes which comprise at least one layer
of this composition are useful for offshore uses and for simpler pipes used in
motor vehicles.
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