Nitrile Rubber: Key Features, Applications, and Sourcing Tips for Buyers
Nitrile rubber (NBR) is a versatile synthetic rubber known for its exceptional resistance to oils, fuels, and chemicals. Widely used in automotive, industrial, and medical applications, this material offers durability and flexibility in demanding environments. This guide explores its key characteristics, types, and practical uses while providing actionable advice for buyers.
How to Find Reliable Nitrile Rubber from China in 2025
China remains a leading supplier of nitrile rubber, offering competitive pricing and diverse formulations. To identify trustworthy manufacturers:
- Verify certifications like ISO 9001 and REACH compliance
- Request material test reports (MTRs) for oil resistance and tensile strength
- Check production capacity (minimum 500 tons/month indicates stable supply)
- Review client testimonials on Alibaba or Global Sources
Top industrial zones for quality NBR include Shanghai, Shandong, and Guangdong provinces.
What Buyers Should Know Before Buying Nitrile Rubber from China
Key considerations when importing:
| Factor | Details |
|---|---|
| MOQ | Typically 1-5 tons for standard grades |
| Lead Time | 15-30 days for custom formulations |
| Shipping | FOB prices 20-30% lower than European suppliers |
| Payment Terms | 30% deposit, 70% before shipment |
Tip: Request samples with 98%+ acrylonitrile content for optimal oil resistance.
Types of Nitrile Rubber
Three primary classifications:
Standard NBR
ACN content 18-50%, suitable for fuel hoses and gaskets
Hydrogenated NBR (HNBR)
Enhanced heat resistance (up to 150°C), used in automotive timing belts
Carboxylated NBR (XNBR)
Improved tensile strength for industrial seals
Functions and Features of Nitrile Rubber
Core advantages driving industrial adoption:
- Oil resistance: Withstands ASTM #3 oil swelling by <30%
- Tear strength: 20-40 MPa range
- Temperature range: -40°C to +120°C operation
- Compression set: <25% after 22hrs at 100°C
Compared to natural rubber, NBR shows 3-5x better fuel resistance.
Scenarios of Nitrile Rubber
Primary applications across industries:
Automotive
Fuel system components (70% of OEMs use NBR seals)
Medical
FDA-approved gloves with >99% puncture resistance
Industrial
Conveyor belts in food processing plants
How to Choose Nitrile Rubber
Selection matrix based on application needs:
| Requirement | Recommended Type |
|---|---|
| High oil exposure | NBR with 40-50% ACN |
| Flexible seals | Medium ACN (33-36%) |
| Chemical resistance | XNBR with zinc oxide |
For extrusion applications, specify Mooney viscosity 50-70 MU.
Nitrile Rubber Q & A
Q: How does nitrile rubber compare to silicone?
A: NBR offers superior oil resistance but lower temperature range than silicone (-40°C vs -60°C).
Q: What's the typical shelf life?
A: 5-8 years when stored below 25°C away from ozone sources.
Q: Can NBR be recycled?
A: Yes, through devulcanization processes achieving 80% material reuse.
Q: Minimum order quantities from China?
A: Most factories accept 1-ton trial orders for standard grades.
Q: Lead time for custom formulations?
A: Allow 4-6 weeks for compound adjustments and testing.
