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NSF-Listed Compounds
Double E

NSF-Listed Compounds

Suppliers of drinking water systems know that access to markets throughout the world requires that their products be certified to NSF/ANSI Standard 61 (“NSF 61”). NSF 61 sets limits for the amount of chemicals permitted to leach into drinking water from the materials used in water transmission and distribution. Parco has more than fifteen years of experience providing seals that meet NSF 61.

Parco offers O-rings and custom molded seals in both sulfur-cured and peroxide-cured compounds, specially formulated to resist chloramines. Some of Parco’s NSF listed compounds also meet the Federal Drug Administration (FDA) requirements for food-handling. To quickly find the best NSF listed compound for your application, please see the table below.

NSF-Listed Compounds

Elastomer Compound Durometer
(Shore A)
Color Key Properties
 Silicone 1225-40 40 Brick Red Low cost; peroxide-cured
 Silicone 1229-60 60 Brick Red Low cost; peroxide-cured
 Silicone 1225-70 70 Brick Red Low cost; peroxide-cured
Nitrile 4926-70 70 Black Low cost; sulfur-cured
Nitrile 4926-80 80 Black Low cost; sulfur-cured
EPDM 5778-50 50 Black Peroxide-cured; internally lubricated; FDA-conforming
EPDM 5300-70 70 Black Low cost; peroxide-cured; FDA-conforming
EPDM 5315-70 70 Black Low cost; sulfur-cured; FDA-conforming
EPDM 5323-70 70 Black Low cost; peroxide-cured
EPDM 5325-70 70 Black Low cost; peroxide-cured; FDA-conforming; WRAS
EPDM 5763-70 70 Purple Peroxide-cured; FDA-conforming
EPDM 5778-70 70 Black Peroxide-cured; internally lubricated; FDA-conforming
EPDM 5315-80 80 Black Low cost; sulfur-cured
EPDM 5323-80 80 Black Low cost; peroxide-cured; FDA-conforming
EPDM 5778-80 80 Black Peroxide-cured; internally lubricated; FDA-conforming
EPDM 5778-90 90 Black Peroxide-cured; internally lubricated; FDA-conforming

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