Some items not addressed by this standard are performance, taste and odor, and microbiological growth support. However it does not address all aspects of product use. NSF/ANSI Standard 61 Drinking Water System Components - Health Effects establishes minimum health effects requirements for materials, components, products, or systems that contact drinking water, drinking water treatment chemicals, or both. It is important to note not all gaskets, seals and diaphragms are made of materials that have been scientifically proven not to leach out substances in quantities that could be harmful.

Glass fiber reinforced epoxy (GRE) is widely used in gaskets where mating flanges must be electrically isolated (Figure 3). Polytetrafluoroethylene (PFTE) based materials are used in applications where chemical resistance or high levels of purity are required.

Rubber-bound fiber sheet finds application in a variety of flange gaskets where, because of limitations on size or gasket stress, homogenous elastomers cannot be used. Even fluoroelastomers (FKM) are being used in gaskets for CPVC piping, where leaching of plasticizers from other elastomers can compromise the piping. Compounds of natural (NR), styrene butadiene (SBR), and acrylonitrile butadiene (NBR) rubbers and Chloroprene (Neoprene ) have been used for decades for pipe seals, gate valves, flange gaskets and O-rings.Įthylene propylene diene rubber (EPDM), with its superior hydrolytic stability and resistance to chloramines, is becoming more widely used in these applications. To meet this objective requires a wide range of sealing materials.īecause of their resilient properties, elastomers account for a large portion of these materials. To ensure water is fit for human consumption, use of materials that may leach hazardous substances into these systems must be avoided. Environmental Protection Agency (EPA) prescribes potable water quality standards in its National Primary Drinking Water Regulations (40 CFR 141). On its journey from the source to the tap, water typically passes through miles of pipe and various mechanical devices such as pumps, meters, and valves, all of which require seals. There are numerous potential sources of contamination in potable water systems, not least of which is contact with the components comprising these systems.

Mas epoxy potable water review