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Home » Products » NBR Nitrile Rubber Foam Insulation & Packaging Solution for Construction

Nitrile Butadiene Rubber Products NBR

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NBR Nitrile Rubber Foam Insulation & Packaging Solution for Construction

  • Excellent resistance to oils, fuels, fats, diluted acids and alcohols.
  • Strong abrasion, tear and impact resistance
  • High elasticity and long-term durability
  • Non-toxic safety certification
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Nitrile Butadiene Rubber (NBR), commonly known as Buna-N, is a synthetic elastomer copolymer made via emulsion polymerization of acrylonitrile (ACN) and butadiene. Renowned for top-tier oil resistance among synthetic rubbers, NBR is a flexible material widely applied in automotive, aerospace, petroleum, and general industrial fields globally, serving as the preferred choice for oil-contacting parts.

This core advantage stems from polar cyano (-CN) groups in its molecular chain, granting strong resistance to mineral oils, fuels, greases, and non-polar solvents. It offers reliable heat resistance (long-term -40℃ to 120℃, short-term up to 150℃ in oil), plus excellent abrasion resistance, airtightness, water resistance, adhesion, and easy mass-processability—solidifying its status as an industrial staple.

NBR is classified by acrylonitrile (ACN) content into five grades: ultra-high (≥43% ACN), high (36%-42% ACN), medium-high (31%-35% ACN), medium (25%-30% ACN), and low (≤24% ACN). Higher ACN enhances oil resistance and airtightness but reduces low-temperature flexibility, enabling tailored NBR solutions for diverse needs.

Key applications include automotive (fuel hoses, oil seals, gaskets), aerospace (fuel system seals), petroleum (drilling hoses, tank liners), printing (ink rollers), and protective gear (oil-resistant gloves). Modified variants like HNBR and XNBR extend its utility to high-temperature and high-adhesion scenarios.

As a cost-effective oil-resistant synthetic rubber, NBR balances performance and affordability. We supply premium NBR with customized ACN content, ideal for harsh industrial environments. Contact us for tailored solutions to upgrade your products.

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Chemical & Physical Specifications: The acrylonitrile (ACN) content is a core parameter, ranging from 18% to 50%. Low ACN (18-25%) offers superior flexibility (-40℃ to 100℃ operating temp), ideal for cold-resistant seals. Medium ACN (30-35%) balances oil resistance and elasticity (volume change ≤8% in mineral oil), suitable for general industrial use. High ACN (40-50%) delivers extreme oil/fuel resistance (volume change ≤5% in fuel oil) for automotive engine components.
 
Mechanical Properties: Hardness spans 30-90 Shore A (customizable). Tensile strength ranges from 10-25 MPa, elongation at break 200-500%, and compression set ≤25% (70℃×22h). Wear volume loss is ≤0.15 cm³ (ASTM D4060), ensuring long service life in high-friction scenarios like construction door seals.

Performance Specifications: Operating temperature ranges from -40℃ to 120℃ (modified grades up to 150℃). It resists mineral oils, fuels, and weak acids/alkalis (pH 4-10), with ozone resistance (50pphm×48h no cracking) for outdoor use. Gas permeability is low, enabling excellent air/water tightness for hydraulic gaskets and window weatherstripping.
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Can you customize NBR products according to specific procurement requirements?

Yes. We offer full customization for NBR (nitrile butadiene rubber) products, including ACN content (18%-50%), hardness (30-90 Shore A), dimensions, and shapes (seals, gaskets, foam). OEM/ODM services are available to match your automotive, construction, or industrial equipment needs.

What certifications do your NBR products have for global procurement?

Our NBR products comply with international standards, including ISO, ASTM, and FDA (for food-contact grade). They also meet automotive industry OEM specifications, ensuring eligibility for global trade and industrial application compliance.

What is the lead time for bulk NBR procurement?

For standard NBR products, lead time is 7-15 working days. Customized orders take 20-30 working days depending on quantity and complexity. We support large-batch production to meet your urgent project schedules.

How to select the right ACN grade of NBR for different applications?

Choose low ACN (18-25%) for cold-resistant scenarios (-40℃~100℃); medium ACN (30-35%) for general industrial use; high ACN (40-50%) for automotive engine seals requiring extreme oil resistance. Our team provides professional recommendations based on your use cases.

Do you provide pre-shipment quality inspection for NBR orders?

Yes. Every batch of NBR products undergoes strict pre-shipment inspection, covering hardness, tensile strength, oil resistance, and dimensional accuracy. We provide a detailed inspection report to ensure product quality meets your procurement standards.
NBR’s unique combination of oil resistance, durability, and flexibility makes it indispensable across automotive, construction, and industrial sectors, with tailored uses for diverse procurement needs.
 
In the automotive industry, it is widely used for engine seals, transmission gaskets, brake system components, and door/window weatherstripping—high ACN grade (40-50%) NBR ensures resistance to fuel and high temperatures (up to 150℃ for modified grades), while medium ACN grade (30-35%) offers balanced elasticity (elongation at break 200-500%) for reliable sealing performance.
 
For construction and doors & windows, NBR serves as weatherstripping, gap fillers, and curtain wall seals—adopting medium ACN grade with 60-80 Shore A hardness, it leverages excellent air/water tightness, sound insulation (≥25dB), and UV resistance (50pphm×48h no cracking) to enhance building energy efficiency and durability.
In industrial equipment, NBR is ideal for hydraulic system seals, pump valves, chemical tank liners, and machinery gaskets—medium to high ACN grades with compression set ≤25% (70℃×22h) and high-pressure resistance (≤30MPa) suit harsh working environments, while its chemical stability (resisting weak acids/alkalis pH 4-10) extends service life.
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