Seal the Future – Silicone That Stands Strong in Oil-Rich Environments
In the world of fluid power and thermal stress, ordinary elastomers soften, swell, or crack—but Mingyi’s Oil-Resistant HCR Series redefines durability. Engineered for parts that live inside engines, pumps, and hydraulic systems, these silicone rubbers deliver consistent sealing force and mechanical integrity even when immersed in hot IRM903 or ASTM #1 oils.
What sets this range apart is its balanced property profile. The IOTA-9740 (40 Shore A) offers superb elongation for low-pressure diaphragms, while the IOTA-9770 (70 Shore A) provides higher modulus for wear-resistant bushings and valve seats. Across all four grades, density ranges from 1.23 to 1.32 g/cm³, and tear strength remains steady at 15 kN/m—ensuring crack propagation resistance during assembly and operation.
After 70 hours at 150°C in IRM903 oil, the data speaks volumes: hardness shift is limited to -16~-18, tensile retention stays above 65%, and elongation retention exceeds 80%. Volume increase is tightly controlled at 35–36%, meaning your parts maintain critical tolerances without excessive swelling or loss of compression set resistance. This predictability translates into fewer field failures, longer maintenance intervals, and enhanced equipment reliability.
Manufacturing is straightforward and cost-effective. With a standard peroxide cure system (1% of 50% bis(2,4-dichlorobenzoyl) peroxide, 175°C × 5 min × 15 MPa), you can achieve high-output production with minimal rejects. The compound flows well in compression and transfer molding, ensuring complex geometries are filled uniformly.
From fuel-flange seals to transformer gaskets, Mingyi’s oil-resistant HCR is the trusted choice for engineers who refuse to compromise. Backed by consistent quality and technical support, this series empowers you to design safer, longer-lasting products. Contact us now to discuss your specification—and let our silicone work where others weaken.