ORID O-ring Material Identifier

The ORID (O-Ring Identifier) is a tool designed to identify the material composition of O-rings without causing damage. It operates by measuring the rebound height of a weight dropped onto the O-ring, which varies based on the material’s properties. This method allows differentiation among common elastomers such as EPDM, Nitrile (Buna-N), FFKM, and FKM/Viton®.

How to Use the ORID:

1. Preparation:
   • Place the O-ring on a stable, flat surface.
   • Ensure the O-ring is within its rated shelf life and is undamaged.
2. Operation:
   • Position the ORID tool vertically over the O-ring.
   • Raise the internal weight to the top of the tube.
   • Release the weight, allowing it to drop onto the O-ring.
3. Interpretation:
   • Observe the height of the first bounce of the weight.
   • Compare this bounce height to the calibrated markings on the ORID tool to determine the material:
     • Highest Bounce: EPDM
     • Second Highest: Nitrile
     • Third Highest: FFKM
     • Lowest: FKM/Viton®

This non-destructive testing method is particularly useful for verifying O-ring materials during installation, checking for mislabeled O-rings, and sorting applications.

Considerations:

• The ORID is calibrated for O-rings with a hardness between 60 to 80 Durometer.
• It is not suitable for identifying failed, damaged, or out-of-date O-rings.
• Accurate readings depend on proper technique and a stable testing surface.