It must be prevented that undesirable chemicals from plastic parts enter the drinking water which affect the quality, taste and smell of the drinking water. Het Waterlaboratorium has expertise to perform this laborious research. For migration testing, Het Waterlaboratorium receives types of these plastics products from all over the world. Material is being tested with special equipment under various conditions as prescribed in procedures. Special odorless stoves are used in which the samples can be conditioned at 23, 60 and 85 degrees Celsius; the migration tests can be carried out at the desired temperature.
Depending on the product that has to be tested, the migration water is tested based on taste, odor and total organic carbon. If a product meets all standards, Kiwa gives a so-called Kiwa Water Mark.
Besides the above mentioned tests, it can be investigated to what extend a product which interact with water is capable of forming a biofilm. Biofilm is a layer of microorganisms surrounded by self-produced mucus that adheres to a surface. This mucus layer is also called ECM: "extracellular matrix". This matrix can comprise up to 90 percent of the biomass of a biofilm, of which the rest consists of bacteria. Regrowth of microorganisms is undesirable. Implementation of this BPP test (Biomass Production Potential) takes four months.