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NSF 61 Certified Chloramines Resistant Rubber Compound

Chloroseal™ is RubberMill’s premier EPDM compound designed to meet the demanding specifications of NSF 61. All devices and components that contact drinking water need to be certified under the National Sanitary Foundation Standard 61- Certified Drinking Water System Components. This standard establishes minimum requirements for the control of potential diverse human health effects from products that contact drinking water (potable water). Chloroseal™ NSF 61 certification is achieved by testing the compound in hot water (180°F). Materials that achieve hot water ratings are also certified for cold water.

In addition to NSF 61 certification, a rubber component that will be exposed to water supplied by municipalities needs to be chloramines resistant. Chlorine is used as a disinfectant in municipal water supplies, It can react with contaminants in the water to form toxic DBP’s (disinfectant by-products). Ammonia is frequently added to reduce DBP’s and reacts with the chlorine to form chloramines. The chloramines are relatively harmless when consumed by people. Unfortunately, chloramines are destructive to common rubber compounds and cause premature sealing failures. The American Society for Testing and Materials (ASTM) test method D6284 measures changes in hardness and volume of a rubber compound that is immersed in 50ppm of chloramines.

RubberMill’s Chloroseal™ compound passes both of these standards to ensure a safe, effective and long lasting molded rubber component.

Chloroseal™ – EPDM, 70 (+/- 5) Durometer/Shore A

Property/Test Standard ASTM D2000 Std. Result
Durometer, Shore A ASTM D2240 70 (+/-5) 71
Tensile Strength ASTM D412 min 7.0 MPa 11.7 MPa
Elongation ASTM D412 min 250% 312%
Heat Resistance
Change in hardness
Change in tensile strength
Change in ultimate elongation
ASTM D573
70h @ 70C
+/- 15 max points
+/- 30 max points
-50 % max
+2 points
-8 points
-17%
Chloramine Resistance
Change in hardness, Shore A
Volume change
ASTM D6284
Immersion in 50ppm Chloramines 672h @ 70C
ASTM D6284
+/- 4 max points
+/- 20% max
+1 points
+1.9%
Properties are typical values. Final determination for suitability for use must be made by the customer (09/14)

Use the Request A Quote feature of the RubberMill website for pricing of your components using Chloroseal™.