High Temperature O-Ring Cord Stock
62 Products
What Is High-Temperature O-Ring Cord Stock?
Cord stock is uncut silicone rubber cord sold in fixed lengths rather than pre-formed rings, so it can be cut and bonded into a custom O-ring in a size that isn't stocked as a finished part. LILY Bearing carries this cord in two cross-section shapes — round and square. Square is a single Durometer 70A compound rated to 400°F, while round is stocked in three material variants covering a wider range of hardness and temperature options.
Shop by Cross Section Shape
| Shape | Hardness | Color | Temperature Range | Best Suited For | Note |
|---|---|---|---|---|---|
| Round | 50A | Black | −60°F to +400°F | General-purpose custom rings | Same range as square |
| 70A | Blue | −40°F to +360°F | Moderate-heat applications | Narrower range than the other two variants; check availability before specifying | |
| 70A | Red | −60°F to +450°F | Extreme-heat applications | Highest temperature ceiling in the high-temperature O-ring lineup | |
| Square | 70A | Red | −60°F to +400°F | Custom static seals | Single variant, no hardness or color options |
Round cord stock offers the widest range of options in this lineup, including a 450°F-rated variant for applications that exceed the standard 400°F ceiling. Cord stock is sold in fixed cut lengths; customers bond the cut piece into a ring sized for their specific gland.
Where Is High-Temperature Cord Stock Used?
- Custom or oversized seals for ovens and heat-treatment equipment
- Field repairs where a stock O-ring size isn't available
- Legacy or discontinued equipment with non-standard bores
- Prototype and low-volume seal fabrication
Frequently Asked Questions
Which round cord stock variant should I choose for the highest heat?
The red 70A variant is rated to 450°F, the highest ceiling in this lineup, 50°F above the standard silicone rating used elsewhere in the high-temperature O-ring range.
Is square cord stock available in different hardness or color options?
No — square cord stock is currently stocked in a single Durometer 70A, red compound rated to 400°F. If you need a different hardness or an extended temperature rating, round cord stock offers more variants to choose from.
Why does the blue 70A round variant have a narrower temperature range?
This variant is rated from −40°F to +360°F, a narrower window than the black 50A or red 70A round options. Confirm current availability and pricing before specifying it for a new design.
