Piston Cup 4.00 Inch Supergold Flat Back (SKU:P512122) API 7K-certified HNBR rubber with Kevlar reinforcement (tensile strength ≥28MPa), isostatic molding process (density 1.35g/cm³±0.02), compatible with oilfield mud pumps under high pressure (≥35MPa), corrosion-resistant (ASTM D2240 hardness 90±5 Shore A), operating temperature range -40℃~150℃。
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