Rubber Seals & O-Rings
NBR O-Rings
O-rings in NBR, a nitrile compound with good oil resistance. NBR is the standard choice wherever a seal meets mineral oils, fuels and other hydrocarbons, and it is used mainly in the automotive industry as well as in aerospace, wire and cable and home appliances.
- NBR nitrile rubber
Product Overview
O-rings in NBR, a nitrile compound with good oil resistance. NBR is the standard choice wherever a seal meets mineral oils, fuels and other hydrocarbons, and it is used mainly in the automotive industry as well as in aerospace, wire and cable and home appliances. It gives long service in oil saturated environments at a cost well below the speciality fluoroelastomers.
Key Benefits
- Strong resistance to oils, fuels and other hydrocarbons
- The most economical compound for oil duty, so it is the sensible default
- Proven across automotive, aerospace, wire and cable and appliance use
- Available in standard series sizes and custom dimensions
- Consistent fit in the groove batch after batch
Problems It Solves
- Seals swelling and failing in oil because the compound is wrong
- Speciality compounds specified and paid for where NBR would do the job
- Leaks in fuel and hydraulic systems
- Inconsistent seal quality across suppliers
Where It Is Used
Applications And Buyers
Application Scenarios
- Hydraulic and fuel system seals in vehicles
- Aerospace component sealing
- Wire and cable gland sealing
- Home appliance seals in contact with oils and greases
Who It Is For
- Automotive component manufacturers
- Hydraulic equipment builders
- Appliance manufacturers
- Distributors stocking general purpose industrial seals
Technical Features And Specifications
Technical Features
- NBR nitrile compound
- Good oil resistance
- Suitable for fuels and hydrocarbons
- Standard and custom sizes
- Cost effective relative to fluoroelastomer compounds
| Material | NBR (nitrile rubber) |
|---|---|
| Key Property | Good oil resistance |
| Main Industries | Automotive, aerospace, wire and cable, home appliances |
| Sizes | Standard series and custom dimensions |
| Supply Basis | Moulded to size |
How It Is Made And Checked
Materials Process And Quality Control
Materials
- NBR nitrile rubber
Manufacturing Process
- Compression moulding
- Trimming
- Inspection
Quality Control
- Specification agreed in writing before production starts
- First article or sample approved against the agreed specification
- Goods inspected and photographed at the factory before loading
- Inspection report sent to you before the container sails
Customisation Options
What Can Be Varied
- Size to the AS568 series or to your groove dimensions
- Hardness specified for the pressure and groove
- Colour for identification
- Packaging and kitting
- Batch quantities from sample to production
Compared With The Alternatives
| EPDM O-rings | EPDM is excellent in water, steam and brake fluid but poor in mineral oil; NBR is the opposite. Swapping them is the classic cause of early seal failure. |
|---|---|
| FKM O-rings | FKM takes higher temperatures and a much wider range of chemicals, at several times the price. NBR is the right answer wherever its temperature range is enough. |
Use Guide
- Confirm the fluid is oil or fuel based before choosing NBR
- Check the operating temperature against the compound's range, since NBR hardens as heat rises
- Machine the groove to the recommended squeeze
- Avoid stretching the O-ring over sharp edges on installation
Questions
Questions Buyers Ask About This Product
What is NBR good at?
Oil resistance. It is the standard compound for mineral oils, fuels and other hydrocarbons.
Which industries use NBR O-rings?
Mainly automotive, plus aerospace, wire and cable and home appliances.
Can you supply custom sizes?
Yes, alongside the standard series. Send the groove dimensions or the inside diameter and cross section.
Should I use NBR in water or steam?
No. EPDM is the correct compound for water, steam and many chemicals; NBR is for oils and fuels.
What hardness should I specify?
It depends on pressure and groove design. Tell us both and we will recommend a hardness.
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Get A Price For NBR O-Rings
Send the duty figures, the material if it is fixed, and the quantity. We will confirm the specification and quote against it.