NBR Selection for Defense: ACN, Hardness, and Service Band Map
For defense sealing, specify NBR (nitrile butadiene rubber) at 33-50% ACN for fuel and hydraulic service between -30°C and +120°C, with Shore A 60-80 hardness and tensile strength of 1,500-3,000 psi. HNBR is the upgrade when service temperature or ozone exposure exceeds NBR's envelope.
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