According to DVGW worksheet W 270, products and materials are tested for migration of chemicals and growth of microorganisms. The German gas and water association (DVGW) sets high standards in this regard. Elastomer is the most suitable material for drinking water.
Materials used in the drinking water sector must have a surface that excludes unwanted surface contamination by microorganisms. This is very important from a hygienic-microbiological point of view. In addition to various technical and mechanical requirements, hygienic conditions must also be guaranteed.
Plastic and rubber-based gasket materials to be applied in contact with drinking water must comply with the microbiological growth requirements according to DVGW standard W270.
DVGW standard W 270 describes a method for evaluating the enhancement of microbial growth on non-metallic materials in contact with drinking water. The test is carried out on the gasket sheets of the material.
Manufacturers, traders and suppliers of plastic or rubber materials, parts and products, equipment and machinery require a valid Test Certificate proving the seal layer's compatibility with DVGW W270.
According to the W270 worksheet, the test is a pure compound test/test on the compound (Il test secondo il foglio di lavoro W270 è un test cigar sulla mescola), so it must be done with the material used for its manufacture. consumer goods in the form of plates. (sotto forma di placchette) I couldn't find this word in the dictionary. typo? The W270 test consists of placing the rubber material inside an existing water pipe for a period of 3 months. The result is a volumetric assessment of bacteriological growth scraped from the walls of the plates. In this case, too, the requirements vary according to the categories related to the contact surface of the article (A, B, C, D2 and DXNUMX), as in the KTW standard. Such a certificate is valid for a period of five years.
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