Common Regulations for Potable Water Systems
Potable water systems and applications are highly regulated around the globe. It is critical to understand the local regulatory requirements for any area your products will be used or sold, and ensure all seals and components are compliant to local specifications. Marco offeres a range of products available in materials compliant to one or more common specifications. See Popular Marco Compounds section below.
Contact us to discuss your application or get assistance choosing a product or material.
NSF-61 / ANSI 61 Specification (United States)
NSF-61 / ANSI Standard 61 is a specification issued by the National Sanitation Foundation (NSF) which defines the acceptable levels of contaminating substances and impurities that may leach into drinking water systems from components such as seals and hardware. NSF-61 is the most commonly used specification for potable water systems in the United States.
WRAS BS6920 Specification (United Kingdom)
Water Regulations Advisory Scheme (WRAS) specification BS6920 compliance is commonly required for drinking water systems in the United Kingdom. WRAS BS6920 compliance requires similar contamination testing to NSF-61. Additionally, the spec also requires elastomer products be tested to ensure the materials do not promote the propagation of bacteria.
KTW W270 Speification (Germany)
Kunststoff-Trinkwasser (KTW) W270 is a potable water specification by the German Technical and Scientific Association for Gas and Water (DVGW)."
ACS XP P 41-250 Specification (France)
Attestation de Conformité Sanitaire (ACS) XP P 41-250 is a specification developed by French health authorities to evaluate and certify parts used in drinking water systems. ACS XP P 41-250 is written specifically for systems related to drinking water intended for human consumption.
Common Product Types
- Tri-clamp gaskets / sanitary gaskets
- PTFE (Teflon) encapsulated o-rings
- X-rings
- Rubber washers
- Custom rubber components
- Custom plastic components
- O-rings (standard, micro, and giant sizes depending on application)
Popular Marco Compounds for Drinking Water Applications
Compound # | Datasheet | Material | Color | Low Temp °F (°C) | High Temp °F (°C) | NSF61 | WRAS | KTW | ACS | WRc | FDA* | ADI Free | Metal Detectable | Features |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | NBR | Black | -30 (-34) | 250 (121) | ||||||||||
| NBR | Black | -30 (-34) | 250 (121) | ||||||||||
| NBR | Blue | -40 (-40) | 250 (121) | ||||||||||
| NBR | Black | -40 (-40) | 250 (121) | ||||||||||
| NBR | White | -30 (-34) | 250 (121) | Clean room manufactured | |||||||||
| EPDM | Black | -65 (-54) | 300 (149) | ||||||||||
| EPDM | Off-White | -65 (-54) | 300 (149) | Clean room manufactured | |||||||||
| EPDM | Off-White | -65 (-54) | 300 (149) | ||||||||||
| EPDM | Black | -65 (-54) | 300 (149) | Chloramine resistant | |||||||||
| EPDM | Black | -65 (-54) | 300 (149) | Chloramine resistant | |||||||||
| SIL | Clear | -65 (-54) | 400 (204) | Clean room manufactured | |||||||||
| SIL | Blue | -65 (-54) | 400 (204) | ||||||||||
| SIL | Red | -65 (-54) | 400 (204) | ||||||||||
| FKM | White | -15 (-26) | 400 (204) | Clean room manufactured | |||||||||
| FKM | White | -15 (-26) | 400 (204) | Clean room manufactured | |||||||||
| FKM | Black | -15 (-26) | 400 (204) | ||||||||||
| FKM | Blue | -15 (-26) | 400 (204) | ||||||||||
| FFKM | White | 5 (-15) | 500 (260) |
*FDA compliance per 21 CFR 177.2600 parts A-D, E&F approved compounds available upon request.
The information on this page is to the best of our knowledge accurate and reliable. However, Marco Rubber makes no warranty, expressed or implied, that parts manufactured from this material will perform satisfactorily in the customer's application. It's the customer's responsibility to evaluate parts prior to use.
The temperature ranges presented on this page are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.
Marco Rubber & Plastics is an industry leader in custom sealing solutions that go beyond the limits of catalog commodities. Since 1980, our solutions have delivered reliable, long-lasting success for customers worldwide. We offer the largest inventory of specialty and standard sealing solutions backed by best-in-class technology, service and support.
