Rubber Seals
NBR O-Rings
NBR is the working compound for anything that meets oil or fuel at moderate temperature.
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Rubber Seals
HNBR O-Rings and HNBR Seals
HNBR is the compound we reach for when a nitrile seal has to stay reliable in cold medium service. It is used predominantly for cold medium sealing, and in the automotive industry it carries power steering pipes and oil seals. Beyond automotive it appears in packer and screw pumps and in O-ring duty where standard nitrile is working at its limit.
Why It Wins
Key Benefits
- Suited to cold medium sealing where standard nitrile becomes marginal
- Proven in automotive power steering pipes and oil seals
- Used in packer and screw pump service
- Available in AS568 sizes from existing moulds and in custom sizes to drawing
- Supplied alongside the rest of a mixed compound schedule on one order
The Brief
Problems It Solves
- Nitrile seals that stiffen and leak at cold start
- Oil seals replaced too frequently in vehicle service
- Pump seals specified without regard to the medium temperature
- Sourcing a specialised compound in modest quantity
Audience
Who It Is For
- Automotive tier suppliers specifying power steering and oil seal components
- Pump builders and pump maintenance teams
- Design engineers whose nitrile seals fail at the cold end of the range
- Buyers consolidating a mixed compound seal schedule
In Service
Application Scenarios
- Cold medium sealing in industrial equipment
- Automotive power steering pipe seals
- Automotive oil seals
- Packer pumps and screw pumps
- General O-ring duty at the limit of standard nitrile
Specification
What You Are Actually Buying
Only values our own records support appear here. Anything we cannot evidence is left out rather than estimated.
| Material | HNBR hydrogenated nitrile rubber |
|---|---|
| Primary Use | Cold medium sealing |
| Automotive Applications | Power steering pipes and oil seals |
| Industrial Applications | Packer pumps and screw pumps |
| Forms Supplied | O-rings and moulded seals |
| Country of Manufacture | China |
Materials
- HNBR
Manufacturing Process
- Compound selection
- Mould selection or tooling
- Moulding
- Deflashing
- Inspection
- Packing
Detail
Technical Features
- Hydrogenated nitrile compound for cold medium duty
- Supplied as O-rings and as moulded seals
- Standard AS568 sizes available without tooling
- Custom cross sections tooled in our own mould workshop
How We Check
Quality Control
- Compound matched to the stated medium and temperature by our formula engineers
- First article approved before series production
- Dimensional check against the approved sample
- Same formulation reused on repeat orders
Made to Order
Customisation Options
- AS568 dash numbers or custom sizes to drawing
- Moulded seal profiles as well as O-rings
- Hardness selected against pressure and gap
- Supplied within a mixed compound order
Honest Comparison
Where This Is the Right Choice and Where It Is Not
Compared With NBR
Standard nitrile is cheaper and adequate for ordinary oil service. HNBR is what we specify when cold medium performance is the deciding factor.
Compared With FKM
FKM leads on chemical and high temperature resistance. HNBR is the better answer for cold medium duty.
Compared With EPDM
EPDM does not belong anywhere oil is present, which rules it out of most HNBR applications.
Use Guide
How to Specify and Order This Part
State the minimum operating temperature, not only the continuous one
Identify the medium so the compound can be confirmed as suitable
Use an AS568 dash number where the size allows it
Give the pressure and any dynamic movement with the size
Order a sample for fit checking before committing to volume
Related Products
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Y Seals and Y O-Rings
A plain O-ring is not the right answer for every dynamic duty, which is why the Y profile exists.
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Guide
How to Choose a Rubber Seal Material in Six Questions
Six questions decide almost every seal material choice. Answer them before you ask for a price, and the quotation you get back will be worth comparing.
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Guide
EPDM and NBR Where Each One Belongs and Where It Fails
These two compounds cover an enormous share of industrial sealing between them, and they fail in each other's territory. Getting the boundary right removes most avoidable seal problems.
Read the guide →Answers
HNBR O-Rings and HNBR Seals Questions
Why choose HNBR over standard NBR?
HNBR is predominantly used for cold medium sealing, where standard nitrile is at its limit. For ordinary oil service at moderate temperature NBR is usually the sensible choice.
What automotive parts use HNBR?
Power steering pipes and automotive oil seals are the applications we supply most often.
Can you supply HNBR in AS568 sizes?
Yes, from the mould set we already hold.
Do you supply small quantities?
Tell us the quantity with the inquiry and we will confirm what is workable before you commit.
Can HNBR be used in pumps?
Yes. Packer and screw pump service is one of its industrial applications.
How fast is a quotation?
One working day once we have the size, the medium and the quantity.
Quote HNBR O-Rings and HNBR Seals
Send the size or drawing, the working conditions and the quantity. One working day for a considered reply.