Stainless steel

S235JR (ST37-2) plastic-coated steel serves as a basic material, Rilsan-coated, approved for drinking water. Conforms to KTW requirements [official German recommendation concerning the levels of polymers in drinking water] as recommended by the German Federal Department of Health.

S235JR (ST37-2) galvanized steel serves as a basic material, only suitable to a limited extent for drinking water, to be used for flange connections only.

Stainless steel of various qualities depending on groundwater condition and temperature

M No. 1.4301 (X5CrNi18-10), AISI 304
This type of steel is resistant to water and slightly polluted waste water as well as weak organic and inorganic acids. Generally, it is resistant to a pH value up to approx. 4.5 in aggressive substances low in chloride.

M No. 1.4541 (X6CrNiTi18-10), AISI 351
This type of steel has excellent resistance properties to a variety of aggressive media. Furthermore, this material is characterised by good ductility.

M No. 1.4571 (X6CrNiMoTi17-12-2), AISI 316Ti
Similar properties as 1.4404 but with guaranteed resistance to intergranular corrosion due to an increased titanium content.

Additional materials on request