What is NBR Material?
[2025-09-26] | By Xiamen Jinshun Sealing Technology Co., Ltd. Annie Xu
Table of Contents
- Introduction to NBR Material
- Chemical Structure of Nitrile Rubber (NBR)
- Key Properties of NBR Material
- Advantages of NBR
- Limitations of NBR
- Technical Parameters (Table)
4. Common Applications of NBR Material
5. Why Choose NBR for O-Rings and Seals
6. Conclusion & Call to Action
7. FAQ
Nitrile Butadiene Rubber (NBR), also called nitrile rubber, is a synthetic elastomer widely used across automotive, aerospace, medical, and industrial sectors. Developed in Germany during the 1930s, NBR has gained global recognition due to its exceptional resistance to oil, fuels, acids, and many chemicals.
This makes it a reliable choice for O-rings, seals, hoses, gaskets, and gloves, where performance under harsh conditions is critical.
NBR is a copolymer of acrylonitrile (ACN) and butadiene. The balance between these two monomers determines its final performance:
- Higher acrylonitrile content → better oil and chemical resistance, lower flexibility
- Lower acrylonitrile content → improved elasticity, but reduced fuel resistance
This flexibility in formulation allows manufacturers to fine-tune NBR for specific applications.
Advantages of NBR
- Excellent resistance to oil, gasoline, acids, and aliphatic hydrocarbons
- Wide temperature operating range: -40°C (-40°F) to +108°C (226°F)
- High resistance to abrasion and tearing
- Reliable water resistance
- Cost-effective compared to other specialty elastomers
Limitations of NBR
- Lower flexibility compared to natural rubber
- Poor resistance to ozone, sunlight, and weathering (not ideal for outdoor use)
- Limited resistance to aromatic hydrocarbons
Technical Parameters of NBR
| Property | Typical Range/Value | Notes |
|---|---|---|
| Acrylonitrile content (ACN) | 18% – 50% | Higher ACN = better oil resistance |
| Operating temperature | -40°C to +108°C | Standard grades; special grades higher |
| Tensile strength | 10 – 25 MPa | Depends on formulation |
| Hardness (Shore A) | 40 – 90 | Customizable for applications |
| Compression set resistance | Good | Maintains sealing properties |
| Weather & ozone resistance | Poor | Requires protective additives or blends |
Thanks to its balance of durability, chemical resistance, and affordability, NBR is one of the most versatile synthetic rubbers. Key applications include:
- Automotive Industry: O-rings, fuel hoses, grommets, and seals resistant to oils and fuels
- Aerospace Industry: Fuel and oil seals, gaskets, and tank linings
- Medical & Safety: Disposable nitrile examination gloves and heavy-duty protective gloves
- Industrial Equipment: Tubing, adhesives, gaskets, and hydraulic seals
For manufacturers and OEMs, NBR O-rings remain a leading choice due to:
- Cost-effectiveness compared to fluorocarbon elastomers
- Proven performance in oil and fuel sealing environments
- Customizable hardness, tensile strength, and composition
- Wide industry acceptance with strong global supply chain availability
At Xiamen Jinshun Sealing Technology Co., Ltd., we specialize in high-quality NBR O-rings, gaskets, and sealing solutions for B2B buyers worldwide. With advanced manufacturing and strict quality control, we support OEM & ODM projects, ensuring durability, reliability, and cost-effectiveness.
NBR material offers the ideal balance of performance, durability, and affordability for applications exposed to oils, fuels, and chemicals. While not perfect for outdoor use, its unmatched resistance in industrial and automotive settings makes it a trusted choice worldwide.
👉 Looking for a reliable NBR O-ring manufacturer and exporter?
Contact Xiamen Jinshun Sealing Technology Co., Ltd. today to discuss your requirements and explore wholesale, distribution, or OEM partnership opportunities.
1. What is NBR material used for?
NBR (Nitrile Butadiene Rubber) is widely used in O-rings, seals, gaskets, hoses, and disposable gloves. Its excellent resistance to oil, fuels, and many chemicals makes it ideal for automotive, aerospace, industrial, and medical applications.
2. Is NBR rubber oil resistant?
Yes. One of the key advantages of NBR rubber is its strong oil and fuel resistance, especially when the acrylonitrile content is high. This makes it a preferred choice for sealing components exposed to petroleum-based fluids.
3. What is the temperature range of NBR O-rings?
Standard NBR O-rings operate between -40°C (-40°F) and +108°C (226°F). Specially formulated grades can handle slightly higher temperatures, but for extreme conditions, alternatives like FKM (Viton®) may be recommended.
4. What are the disadvantages of NBR rubber?
While durable in oils and fuels, NBR has poor weathering and ozone resistance. It is not suitable for prolonged outdoor exposure or environments with high levels of aromatic hydrocarbons.
5. How does NBR compare to natural rubber?
Compared to natural rubber, NBR has superior chemical and oil resistance but lower flexibility and weaker performance in outdoor environments. The choice depends on the specific application requirements.
6. Why choose NBR O-rings for industrial applications?
NBR O-rings are cost-effective, reliable, and customizable, making them one of the most commonly used sealing materials worldwide. They are trusted in engines, fuel systems, hydraulic equipment, and industrial machinery.
7. Can NBR material be customized for OEM requirements?
Yes. At Xiamen Jinshun Sealing Technology Co., Ltd., we offer OEM & ODM services for NBR O-rings, seals, and gaskets. Our team can adjust hardness, tensile strength, and compound formulation to meet your unique project specifications.
👉 Need a reliable NBR O-ring supplier and exporter?
Contact Us Today to discuss your requirements and get a custom quote.