Overview
High-purity nitrile (NBR) is a synthetic elastomer derived from the copolymerization of acrylonitrile and butadiene. It is prized for its exceptional resistance to oils, fuels, and chemicals, making it a preferred material in demanding industrial environments. The term 'high-purity' refers to grades with minimal impurities and consistent acrylonitrile content, which directly influences its performance characteristics. NBR is categorized by its acrylonitrile content, with higher percentages offering greater chemical resistance but reduced flexibility at low temperatures. It is commonly used in automotive, aerospace, and oil & gas industries where durability and resistance to harsh conditions are critical.
Physical and Chemical Properties
High-purity nitrile exhibits a density range of 0.96-1.00 g/cm³ and is typically a pale yellow to amber solid. Unlike thermoplastics, it does not melt but degrades at high temperatures (above 120°C). Its solubility is limited to certain organic solvents like ketones and aromatics, while it remains insoluble in water and polar solvents. The material's key properties include excellent resistance to oils, fuels, and chemicals, alongside good tensile strength and abrasion resistance. Its performance can be further enhanced by compounding with additives such as carbon black or plasticizers, depending on the application requirements.
Main Applications
High-purity nitrile is extensively used in the manufacturing of seals, gaskets, and O-rings due to its oil and chemical resistance. These components are critical in automotive engines, hydraulic systems, and fuel handling equipment. It is also employed in industrial hoses, conveyor belts, and printing rollers where durability is essential. Another significant application is in protective gloves, especially for chemical handling and medical use. The material's flexibility and barrier properties make it ideal for disposable and reusable gloves. Additionally, NBR is used in adhesives, footwear, and cable jacketing, showcasing its versatility across industries.
Safety and Storage
When handling high-purity nitrile, it is advisable to use personal protective equipment (PPE) such as gloves and masks to avoid inhalation of dust or skin contact. Although generally non-toxic, uncured NBR may contain residual monomers that could cause irritation. Proper ventilation is recommended during processing. Storage conditions should prioritize cool, dry environments away from direct sunlight and oxidizing agents. Bulk material should be kept in sealed containers to prevent contamination. For B2B buyers, it is crucial to ensure suppliers provide Material Safety Data Sheets (MSDS) and comply with relevant safety regulations.
B2B Procurement Guide
Procuring high-purity nitrile requires attention to specifications such as acrylonitrile content, which typically ranges from 18% to 50%. Higher acrylonitrile grades offer superior chemical resistance but may trade off low-temperature flexibility. Buyers should also verify compliance with industry standards like ASTM D2000 or ISO 9001. Pricing varies based on purity, volume, and supplier, with reference prices ranging approximately $2.50-$5.00 per kg. For large-scale orders, negotiating long-term contracts with certified suppliers can ensure consistent quality and cost savings. Additionally, consider logistical factors like lead times and minimum order quantities (MOQs) to align with production schedules.
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