Parker Hannifin’s Seal Group now provides a choice of sealing materials specifically formulated to meet the NSF Standard 61 protecting potable (drinking) water. This standard ensures that any contaminants that leach or migrate into potable water from rubber, plastic, metal or other water system component materials are within acceptably safe levels. Many water system seals can be affected by water treatment disinfecting processes such as chlorination and ozonation. Over time, chloramines and ozone water additives can cause swelling, flaking and eventual physical breakdown of seal materials. While the seal function may remain stable, the water can become contaminated with seal debris. Parker provides ten EPDM compounds, seven thermoplastic elastomers, and two nitrile compounds to meet the NSF 61 requirements. Seals and gaskets formulated from these organic materials will provide long-term resistance to swelling and breakdown in the presence of water treatment chemicals.
