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Nitrile rubber - Wikipedia
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Buna - Wikipedia
Buna vs. Viton O-Rings: A Quick Guide | Manufacturer's Rubber
Everything You Need to Know About Buna O-Rings
Buna-N Rubber | McMaster-Carr
Understanding the Composition of a Nitrile (Buna-N) Rubber …
Buna - Evonik Industries
Buna Nitrile O-Rings | Global O-Ring and Seal
Nitrile (Buna-N) - Seal Design Guide | Apple Rubber Products