Seal House
NZ's Sealing Specialists
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Seal House can supply a range of both Metric and Imperial Back Ups. Contact us to discuss your Back Up Ring requirements.

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Seal House stocks a comprehensive range of Imperial Back Up Rings to suit imperial O-rings in both contoured-face 90 durometer Nitrile or Urethane.
Seal House also stocks a range of Imperial U-Seal Back Up Rings to suit Piston or Gland application.

Imperial styles include BU.CF, BU.PTFE, BU.PU, BU

Nitrile (NBR) Contoured-face Back Up Rings
Nitrile Back Ups are of 90 durometer hardness. They can be stretched during installation enabling them to be fitted without scarf cutting to suit.


Styles include BU.CF
Urethane / Teflon PTFE Back Up Rings
Urethane and PTFE Back Ups are stocked in a wide selection of sizes and can be manufactured in-house to suit specific requirements. PTFE Back Ups need to be fitted into either a 2-part housing, or scarf cut to fit.


Styles include BU.G, BU.P BU.PTFE, BU.PU

Hytrel Back Up Rings
Hytrel Back Up Rings provide excellent extrusion resistance are harder than standard Back Ups. They can be stretched for installation, and they quickly return to their original size.

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Contact us to discuss your special Backup Ring requirements or give us a call on 0800 732 573

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Unlike imperial O-ring standards, not all metric O-ring Standards contain specifications for Back Up Rings.
The most common Metric Back Up is the P&G Series O-rings commonly used in injection moulding and earthmoving equipment.
These are stocked as standard in
PTFE, but can also be supplied in Urethane.


Metric styles include BRT, BU.G, BU.P BUP 

Other non-standard sizes can be manufactured in-house. Contact us to discuss your special requirements.

U-Seal Back Ups
Seal House stocks a comprehensive range of
U-Seal Back Up rings . These are available in Imperial or Metric and to suit Piston or Rod application.

Styles include BRT, BUP

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Contact us to discuss your special requirements or give us a call on 0800 732 573

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Extrusion chart
Use these cures to determine maximum diametral clearance. As a good rule of thumb, this value should be kept to a minimum.


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Why use Seal House?

  • We have a proven reputation for providing Quality Technical Sealing Solutions for any sealing problem.
  • We employ highly experienced and skilled technical staff
  • We ensure that customer satisfaction is a top priority at every level of our company
  • We provide a comprehensive range of standard Back Up Rings in materials, profiles and sizes to suit a wide variety of applications
  • We engineer customised Back Up Rings that meet industry requirements for maximum sealing performance and durability in a wide variety of applications
  • We offer a range of sealing accessories which provide you with a One-stop Shop for all your sealing needs


Most Standard Back Up Rings are available ex-stock. Non standard (Custom Back Up Rings) are generally available on a 2-3 day turnaround. 

Seal Materials

Selecting the most appropriate material for your Back Up Rings has a critical impact on achieving the best sealing performance.
We have a  comprehensive range of the latest materials for all applications, including 
Nitrile, Fluro-Polymers (PTFEs) , and Urethanes amongst others. 

Applications & Industries

Seal House Back Up Rings are are successfully used in the following Industries:


  • Hydraulics
  • Pneumatics
  • Food processing
  • Pharmaceutical
  • Construction
  • Drilling
  • Mining
  • Injection moulding
  • Steel Production
  • Military / Defence
  • Tyre Production
  • Oil Field exploration
  • Packaging
  • Power Generation
  • Dairy
  • Valves and Cylinder Repair Industries 

...and in industries that require high chemical resistance, heavy duty or low friction applications.
Our Back Up Rings are used throughout the South Pacific and Australia.

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