TUBE MANUAL

PA pipelines, lengths of pipe and rolled pipe
Subject to technical modifications
Technical data - Schneider polyamide Pipes
(non-binding guide values based on manufacturer's specifications)
Behaviour towards media
When describing the behaviour of plastic towards media, a distinction is made between different interactions:
- chemical reactions, i.e. decomposition of macromolecules and thus decrease in mechanical strength
- stress cracking, i.e. crack formation already without external, mechanical load
- moisture expansion, i.e. the medium penetrates the plastic in a reversible procedure, thus causing a
softening effect
The following table mainly contains details about media for which statements about materials in our range of
products are available. The statements are guide values that correspond to the current state of knowledge and
experience. They are, however, non-binding, also with regard to industrial property rights of third parties. The
customer is not absolved from making careful application tests, especially as the effect of media on plastic depends
very strongly on factors such as temperature, pressure, concentration of the medium, presentation of the result or
type of plastic. The specifications therefore serve for initial orientation with regard to the chemical stability and
cannot be applied to all application cases.
In the case of statements concerning contact with foodstuffs, you should note that often only specific plastic types
have the necessary certification for contact with foodstuffs.
The individual statements mean:
x = excellent stability, i.e. durability for years
o = conditional stability, i.e. durability for weeks or months
u = unstable; application cannot be recommended
Between these three specifications, however, there are also trends identified by the specifications "x/o" or "o/u",
which means that influencing factors such as temperature, concentration and pressure of the medium can displace
the statements in direction "unstable".
Technical Data, PA Pipelines Status 08/2008 Page 3