JST’s advanced HNBR compound, designated by material code H6390 (Durometer 90), is a premium elastomer specifically formulated for demanding rubber sealing applications. Renowned for its exceptional durability, high tensile strength, and chemical resistance, this material sets a high standard for reliability in critical environments.

Key Properties & Certifications:

• NORSOK M-710 Compliance: JST H6390 successfully passes the stringent requirements of the NORSOK M-710 Edition 3 RGD Test, confirming its suitability for the rapid gas decompression (RGD) conditions prevalent in the oil and gas industry.
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• API 6A & Sour Service Validation: Qualified under API 6A, 21st Edition, Annex F.1.13.5.2 immersion testing for Material Class FF/HH. This material meets the 10% H2S design validation procedures and complies with the sour aging acceptance criteria outlined in ISO 23936-2:2011, ensuring outstanding long-term performance in sour (H2S-containing) environments.
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• Wide Operational Temperature Range: Featuring a low-temperature retraction (TR10) value of -15.9°C, it enables reliable sealing in cold conditions. The effective service temperature range spans from -15.9°C to 150°C, providing exceptional flexibility and thermal stability across a wide spectrum of operational demands.
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• High-Durability Formulation: With a durometer hardness of 90, this grade offers enhanced resistance to extrusion and mechanical wear, making it ideal for high-pressure sealing applications.

Common Applications:

Combining the above excellent characteristics, JST HNBR (H6390) is the material of choice for various critical secondary seals, including but not limited to:

• FS-Seals
• S-Seals
• P-Seals

Beyond secondary seals, JST HNBR (H6390) is also widely deployed across diverse applications where superior sealing performance and material reliability are non-negotiable. Whether facing high-pressure extrusion gaps or aggressive chemical media, H6390 delivers consistent, long-lasting performance.