For close to 30 years QUALITY SEALS has been a stocking distributor of sealing products and solutions the serving industry.

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15 Berkshire Blvd.,
Unit D
Bethel, CT 06801






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Quality Seals
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 ORID®  O-Ring Identifier Tool
  • Verify an O-ring at moment of installation

  • Check for mislabeled O-rings

  • Verify new O-rings

  • Sorting applications: Differentiate between known O-rings

  • Sturdy stainless steel tubular construction is safe to carry in tool boxes

Why not order an ORID® for your toolbox, inspection room or quality control area today? It could pay for itself many times over by identifying an incorrect O-Ring compound before it’s installed or placed in service in a critical application.   

The ORID® 70-C will indicate the material composition of 100, 200, 300 and 400 series O-rings of 60 to 80 Durometer which are already known to be either Viton®, Kalrez®, Nitrile or EPDM. The O-rings must be within their rated shelf life and be unused and undamaged.

How The ORID® Works:

The ORID itself is a tube with a controlled or specific weight inside it. The weight falls a controlled distance. To determine an o-ring's rubber compound, place the o-ring on a stable table or surface. Place the ORID® over the o-ring and raise the weight all the way to the top of the tube (as far as it will go). Release the weight and let it drop onto the o-ring. It will bounce. The height of the first bounce will rise to one of the four calibrated ranges. The highest is EP (Ethylene Propylene). The next is Nitrile. The next is Kalrez®. The lowest graduation is Viton®. This indicates your rubber compound.


  • The height of the FIRST bounce indicates the O-ring:

  • Highest Graduation — EP ethylene propylene O-rings are compatible with most water based chemicals from 70 º F to +300 º F.

  • Third Graduation — NITRILE. Also know as Buna-N. These O-rings are good for most plumbing applications from -30 º F to +225 º F.

  • Second Graduation — KALREZ®. Also known as perfluorocarbon, compatible with most aggressive chemicals from 0 º F to +600 º F.

  • Lowest Graduation — VITON®. This composition is also called fluorocarbon. Viton O-rings are generally compatible with most petroleum based liquids from -15 º to +400 º F.

Click for Vertical Rebound Document (PDF opens in new window)

The results obtained through the use of this device have been consistent and repeatable in our evaluations. However, since a degree of user technique is required we cannot be responsible for specific results.



ORID® is a registered trademark of Bachus Instrument Company
Viton® and Kalrez® are registered trademarks of DuPont







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