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Polyethylene (PE) is an inexpensive thermoplastic that is characterized by good UV resistance (soot stabilized molding compounds), physiological harmlessness and good chemical resistance. The simple molecular structure makes recycling possible.
PE is classified in plastic pipe construction in strength classes according to ISO 9080 (PE 80, PE 100). The permanent development of the PE molding compounds in recent years has significantly improved the performance of PE pipes and moldings. PE 100 materials are produced by a modified polymerization process, whereby these have an altered molecular weight distribution. This results in a higher density as well as improved mechanical properties such as increased stiffness and hardness. The latest generation of materials are PE 100 RC molding compounds. In addition to the time stability, they have a particularly high resistance to crack growth, which improves, among other things, the chemical resistance to stress-cracking media.
These materials are also referred to as third-generation polyethylene types and also as MRS 10 materials. This is a further development of the PE materials, which have a modified molecular weight distribution through a modified polymerization process. As a result, PE 100 grades have a higher density and also improved mechanical properties such as increased stiffness and hardness. The time stability as well as the resistance to slow and rapid crack propagation could be significantly improved. Thus, this material is suitable, For the production of pressure tubes of larger dimensions, since the corresponding pressure stage is achieved in comparison with the conventional pressure tubes made of PE with smaller wall thicknesses.
Tubes made of polyethylene can basically be used in the field of energy-efficient radiation. For example, PE pipes have been used for many years to discharge radioactive wastewater from hot laboratories and as cooling water pipes in nuclear energy technology. The usual radioactive sewage contains beta and gamma rays. PE pipes are not radioactive even after years of use.
Polyethylene corresponds in its composition to relevant food regulations (according to BGA and KTW guidelines). Furthermore, the PE pipes and fittings are tested and approved for drinking water suitability.
Due to its nonpolar structure, PE has an unusually high resistance to a variety of acids and alkalis. It is resistant to aqueous solutions of salts, against non-oxidizing acids and alkalis. Up to 60 ° C, PE is resistant to many solvents, but it is swollen by aromatic and halogenated fats and waxes. Against strong oxidizing agents such as nitric acid, ozone, oleum, hydrogen peroxide or halogens, PE is conditional to non-resistant. The chemical resistance list is the first reference. Specific applications can be clarified with our technical department.
