HNBR O-Rings and HNBR Seals

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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.

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

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

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

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

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

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

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

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

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.

How to Specify and Order This Part

• State the minimum operating temperature, not only the continuous one

State the minimum operating temperature, not only the continuous one

• Identify the medium so the compound can be confirmed as suitable

Identify the medium so the compound can be confirmed as suitable

• Use an AS568 dash number where the size allows it

Use an AS568 dash number where the size allows it

• Give the pressure and any dynamic movement with the size

Give the pressure and any dynamic movement with the size

• Order a sample for fit checking before committing to volume

Order a sample for fit checking before committing to volume

Related Products

NBR O-Rings

NBR is the working compound for anything that meets oil or fuel at moderate temperature.

FKM and FFKM O-Rings

FKM and FFKM sit at the top of the seal material range and are frequently confused with each other.

O-Rings

An O-ring is the cheapest part in most assemblies and the most common cause of a warranty return.

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.

Related Guides and Industries

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.

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.

HNBR O-Rings and HNBR Seals Questions

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.

Power steering pipes and automotive oil seals are the applications we supply most often.

Yes, from the mould set we already hold.

Tell us the quantity with the inquiry and we will confirm what is workable before you commit.

Yes. Packer and screw pump service is one of its industrial applications.

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.