发布于 2026-10-17
Hengshui Zhanhe Engineering Rubber Co., Ltd. supplies nbr cork rubber sheet and related engineering rubber products to contractors, distributors and infrastructure projects worldwide. A vulcanised composite of nitrile rubber and graded cork granules that combines oil resistance with enough compressibility to fill imperfect flange faces.
This article explains the working principle, main types, typical applications, installation points, selection criteria, standards and frequently asked questions about nbr cork rubber sheet, and is intended for engineers, purchasers and project managers.
A vulcanised composite of nitrile rubber and graded cork granules that combines oil resistance with enough compressibility to fill imperfect flange faces.
Working principle: The product works through elastic deformation and mechanical interlock to provide reliable sealing or load transfer.
NBR Cork Rubber Sheet is manufactured and inspected according to applicable national and industry standards. Hengshui Zhanhe Engineering Rubber Co., Ltd. carries out batch inspection before delivery, and inspection certificates together with third-party test reports (where required by the project) can be provided.
Typical standards applied to this product family include Chinese national and transportation industry standards; equivalent international standards can be referenced upon request.
A: Not as a rule. The cork cells are flattened after the first clamp load and no longer push back, so leaks appear early. Only pieces with less than about ten percent thickness loss should ever be reused, and then only for temporary closing.
A: No. A hard sheet needs higher seating stress to flow into machining marks. If the bolts cannot deliver that stress, a softer grade usually seals better. Choose the grade after checking bolt capacity, not before.
A: Standard grades change volume by no more than about ten percent after seventy hours at 100 C in No. 25 transformer oil, so dimensional drift is rarely the failure mechanism; heat ageing and compression set are.
A: Where the joint relies on resilience or is opened often, cork rubber performs better. Hot, heavily loaded joints with ample bolt torque usually favour fibre-reinforced sheet.
Sheet stock is sold by area and die-cut gaskets by piece. Standard 3 mm material is commonly quoted at 90 to 180 CNY per square metre. The price builds up from the acrylonitrile grade of the NBR compound, the screened cork fraction, cure time per batch, nesting waste during cutting, and any flame-retardant package added to the formulation.
Packing: standard export packing (woven bags, pallets or wooden cases). Delivery terms: EXW, FOB, CFR, CIF or DAP as agreed. Payment terms: T/T, L/C or other terms subject to negotiation.
For specification sheets, samples, pricing or project support, please contact Hengshui Zhanhe Engineering Rubber Co., Ltd.. Email: 150051331@qq.com · Tel/WhatsApp: +86-13833886677 · Factory: No.168, Zhangtuantuo Village, Dengzhuang Town, Taocheng District, Hengshui, Hebei, China. We reply to export enquiries within 24 hours on working days.