Overview
Sealing rubber refers to elastomeric materials specifically engineered to create barriers against fluid or gas leakage. These materials maintain their sealing properties under compression and across temperature variations. Common base polymers include nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), silicone, and fluorocarbon (FKM). Each type offers distinct advantages for different operating environments, from automotive engines to food processing equipment.
Physical and Chemical Properties
Sealing rubbers exhibit exceptional elastic recovery, typically with elongation at break ranging from 200% to 800%. Their compression set (permanent deformation after compression) is a critical quality metric, with premium formulations maintaining <20% set after prolonged stress. Chemical resistance varies significantly by formulation. While silicone resists extreme temperatures (-60°C to 230°C), FKM provides superior oil and fuel resistance. EPDM excels in weathering resistance but performs poorly with petroleum products.
Main Applications
In automotive systems, sealing rubber prevents fluid leaks in engines, transmissions, and fuel systems. Industrial applications include pump seals, pipe gaskets, and hydraulic system components where pressure ratings may exceed 3,000 psi. The construction sector utilizes sealing rubber in window/door gaskets and expansion joints, where UV stability and weatherability are paramount. Food-grade silicone variants meet FDA standards for processing equipment and medical devices.
Safety and Storage
Most sealing rubbers are chemically stable at room temperature but may degrade when exposed to ozone, UV radiation, or specific solvents. Proper storage requires keeping materials in original packaging at 15-25°C with <65% humidity. When machining rubber seals, adequate ventilation is essential to prevent inhalation of particulate matter. Combustion produces toxic fumes including hydrogen cyanide (from nitrile rubber) and requires Class D fire extinguishers.
B2B Procurement Guide
Technical specifications should include: Shore hardness (typically 40-90 Shore A), operating temperature range, media compatibility (ASTM D471 test data), and dynamic/static application requirements. For critical seals, request batch test certificates. Leading manufacturers include Parker Hannifin, Freudenberg Sealing Technologies, and Trelleborg. MOQs vary from 1kg for specialty compounds to tonnage quantities for standard formulations. Sample testing under actual operating conditions is strongly recommended before bulk purchases.
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