FAQ | Gasket Material

Does Phelps have any gaskets that are approved to the NSF 61 for Drinking Water?

Yes, Phelps carries multiple products suitable for Drinking Water applications.

  1. Phelps Style 7100 - Aramid with Nitrile Binder, which is direct equavalane of Garlock MULTI-SWELL™ Style 3760U
  2. Phelps Style 7535 - Expanded PTFE gasket material, which is direct equivalent of Garlock 3505 “Blue” GYLON®
  3. Phelps Style 7157 - EPDM, which is a direct equivalent of Garlock 98206 EPDM
  4. Phelps Style 1250 - PTFE Protected Gaskets

For more information, please visit Water World's SEALING MATERIALS FOR POTABLE WATER SYSTEMS

In brief: The U.S. Environmental Protection Agency (EPA) prescribes potable water quality standards in its National Primary Drinking Water Regulations (40 CFR 141). Because of their resilient properties, compounds of natural (NR), styrene butadiene (SBR), and acrylonitrile butadiene (NBR) rubbers and Chloroprene (Neoprene [CR]) have been used for decades for pipe seals, gate valves, flange gaskets and O-rings. Ethylene propylene diene rubber (EPDM), with its superior hydrolytic stability and resistance to chloramines, is becoming more widely used in these applications. Even fluoroelastomers (FKM) are being used in gaskets for CPVC piping, where leaching of plasticizers from other elastomers can compromise the piping.

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

Back to Top