PLAST-O-MATIC Pressure Gauge Guards & Seals - Grainger Industrial Supply

Buna-N is a nitrile rubber with high fuel, oil, and abrasion resistance. It’s a superior option for heavy-duty industrial applications where wetted parts of the seal will be in contact with water, petroleum-based fluids, greases, hydraulic fluids, or alcohols. It has a lower maximum temperature and less resistance to ozone, weather, and sunlight than Viton. It is not recommended for freon, ketones, methanol, and strong acids.
PTFE offers superior chemical resistance to Viton or Buna-N, though it has less high-temperature resistance than Viton and lesser flexibility and other mechanical properties than Buna-N or Viton. It is appropriate for the widest range of chemicals and often used in food, medical, and pharmaceutical applications, but due to its rigidity, it is not appropriate for applications requiring the diaphragm to maintain stretch and compressibility.
Viton is a fluoroelastomer rubber that retains its shape and flexibility when used in high-temperature water applications or in contact with acids and alkaline fluids, hydrocarbons, oils, and salt solutions. It resists many other aggressive chemicals as well as weather, sunlight, and microbial growth, but is vulnerable to ketones or acetone. Viton is a superior choice for very high temperature applications and those exposed to ozone or weathering.

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