O-Ring Material Identifier
Verify an O-ring at moment of installation
Check for mislabeled O-rings
Verify new O-rings
Differentiate between known O-rings
Sturdy stainless steel tubular construction is safe to carry in tool boxes
Pocket clip for easy access
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 height or 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 will be your rubber compound.
The height of the FIRST bounce identifies the O-ring:
EPDM: ethylene propylene O-rings are compatible with most water
based chemicals from 70 º F to +300 º F.
NITRILE: Also know as Buna-N. These O-rings are good for most
plumbing applications from -30 º F to +225 º F.
KALREZ®: Also known as perfluorocarbon, compatible with most
aggressive chemicals from 0 º F to +600 º F.
VITON®: This composition is also called fluorocarbon. Viton
O-rings are generally compatible with most
petroleum based liquids from -15 º to +400 ºF.
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.
(In the Accessory Section)
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| O-Rings Explained | O-Rings Sizing Chart |
| Fluid Compalibility Guide | O-Ring Failure Analysis |
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Viton and Kalrez are a registered trademark of DuPont Performance Elastomers
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