Overview
Nitrile rubber lining is a specialized protective material made from acrylonitrile butadiene rubber (NBR). It is widely used in industrial applications due to its exceptional resistance to oils, fuels, and other petroleum-based products. The material is typically applied as a lining to metal surfaces in tanks, pipes, and processing equipment to prevent corrosion and extend service life. As a synthetic rubber, nitrile rubber lining offers superior performance compared to natural rubber in oil-exposed environments. The acrylonitrile content (typically 18%-50%) determines its oil resistance level, with higher percentages providing better resistance but reduced flexibility at low temperatures.
Physical and Chemical Properties
Nitrile rubber lining exhibits excellent mechanical properties including good tensile strength (typically 15-25 MPa) and elongation at break (300-600%). Its resistance to swelling in oils and fuels makes it particularly valuable for petrochemical applications. The material maintains its properties across a wide temperature range, though prolonged exposure above 120°C may cause hardening. Chemically, NBR lining shows good resistance to aliphatic hydrocarbons, vegetable oils, and many diluted acids and alkalis. However, it has poor resistance to ozone, chlorinated hydrocarbons, and strong oxidizing agents. The material's resistance to permeation by gases is moderate, making it suitable for many containment applications.
Main Applications
The primary use of nitrile rubber lining is in oil and fuel handling systems, including storage tanks, transfer pipes, and fuel dispensing equipment. In the chemical processing industry, it protects equipment handling oils, solvents, and certain corrosive fluids. The material is also used in automotive applications for fuel system components. Other applications include linings for pumps and valves in oil fields, protective coatings for marine equipment, and gaskets in oil-lubricated machinery. Some food-grade formulations are used in edible oil processing equipment, though these require specific certifications and careful material selection.
Safety and Storage
Proper handling of nitrile rubber lining requires attention to workplace safety. While cured material is generally safe, installation often involves adhesives and solvents that require proper ventilation. Workers should use appropriate PPE when cutting or grinding the material to prevent inhalation of rubber particles. For storage, rolls or sheets should be kept in their original packaging in a temperature-controlled environment (15-25°C ideal). Avoid stacking heavy items on stored material to prevent permanent deformation. The material should be protected from direct sunlight and ozone sources (including electrical equipment) which can cause premature aging.
B2B Procurement Guide
When sourcing nitrile rubber lining, buyers should clearly specify the required properties including thickness (commonly 3-12 mm), hardness (typically 60-80 Shore A), and oil resistance level. Consider the operating environment including temperature range, chemical exposure, and mechanical stresses. For food contact applications, verify compliance with relevant standards like FDA 21 CFR 177.2600. Quality indicators include consistent thickness, smooth surface finish, and absence of air bubbles or foreign particles. Lead times can vary significantly depending on custom formulations, so plan procurement accordingly. For large projects, consider requesting samples for testing before full-scale purchase.
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