Overview
Buna rubber, or nitrile rubber (NBR), is a synthetic elastomer developed in the 1930s as an oil-resistant alternative to natural rubber. It is produced by copolymerizing acrylonitrile and butadiene, with the acrylonitrile content (typically 18%–50%) determining its chemical resistance and flexibility. The name 'Buna' originates from 'butadiene' and 'natrium' (sodium, used as a catalyst in early production). NBR is prized for its balance of mechanical properties and resistance to oils, fuels, and chemicals, making it indispensable in automotive and industrial sealing applications. Its versatility allows for compounding with additives to enhance heat resistance, conductivity, or FDA compliance for food/medical uses.
Physical and Chemical Properties
Buna rubber exhibits a glass transition temperature (Tg) between -40°C to -10°C, depending on acrylonitrile content. Higher acrylonitrile levels improve oil resistance but reduce low-temperature flexibility. Its tensile strength ranges from 500–3,000 psi, with elongation at break of 200%–600%. The material’s resistance to aliphatic hydrocarbons, oils, and greases outperforms most rubbers except fluorocarbons. However, it swells in aromatic or chlorinated solvents. NBR also shows moderate resistance to acids and alkalis but degrades under prolonged UV exposure unless stabilized with additives.
Main Applications
Automotive systems rely heavily on Buna rubber for fuel hoses, O-rings, and gaskets due to its fuel resistance. Industrial applications include hydraulic seals, printer rollers, and conveyor belts handling oily materials. In healthcare, nitrile gloves dominate as a latex-free alternative with superior puncture resistance. Specialty grades include hydrogenated NBR (HNBR) for high-temperature environments (>150°C) and carboxylated NBR (XNBR) for improved tensile strength. FDA-compliant grades are used in food processing equipment, while antistatic variants serve in electronics manufacturing.
Safety and Storage
Buna rubber is stable under normal conditions but should be stored away from ozone, strong oxidizers, and temperatures above 40°C to prevent premature aging. Processors should ensure adequate ventilation to avoid inhalation of decomposition products during high-temperature molding or vulcanization. Uncured NBR may contain residual monomers; proper curing reduces this risk. Finished products are generally safe for skin contact, though prolonged exposure may cause dermatitis in sensitive individuals. Always consult material safety data sheets (MSDS) for specific handling guidelines.
B2B Procurement Guide
When sourcing Buna rubber, specify acrylonitrile content (e.g., 34% for general-purpose oil resistance) and hardness (Shore A 30–90). For extreme temperatures, consider HNBR or blended materials. Request certifications like ISO 9001 or FDA 21 CFR §177.2600 for regulated applications. Bulk pricing varies with raw material (butadiene/acrylonitrile) market fluctuations. Lead times typically range 2–6 weeks for custom formulations. Preferred suppliers include Zeon Corporation, LANXESS, and ARLANXEO, which offer technical support for compound optimization.
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