Capped O-Ring
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Product Overview Capped O-rings are a cost-effective solution for providing cap seals for rod and piston seal applications. The seal assembly consists of a cap manufactured from one of Eriks premier PTFE compounds and an O-ring to act as the seal energiser. The design of the capped O-ring protects the elastomer from extrusion and nibbling. The specially profiled cap element acts as the seal’s dynamic interface and prevents spiral failure and reduces stick slip, commonly associated with O-ring seals. Our capped O-rings are designed to retrofit existing O-ring grooves, including AS4716 standard housing dimensions. Both metric and imperial sizes are available and can be tailored to fit housing dimensions provided. Our technical team can also advise on how to optimise O-ring squeeze to minimise seal friction. |
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Elastomeric Energiser Materials
| Elastomer | Colour | Hardness (IRHD) | Temperature Range | Select for.. | Compound Reference |
|---|---|---|---|---|---|
| Silicone (VMQ) | Red | 70 | -60 to +220oC |
High and very low temperature; high eccentricity |
714177 |
| Polyacrylate (ACM) | Black | 70 | -10 to +150oC |
High temperature capabilities; good compatibility with engine oils |
335001 |
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Nitrile Rubber (NBR) |
Black | 70 | -30 to +120oC | General Purpose | 36624 |
| Fluorocarbon (FKM, A-type) | Black | 75 | -20 to +200oC |
High temperature performance; high speed applications; 514141 (Viton® GF type) for improved coolant and fuel resistance |
51414 |
| Green | 75 | -20 to +200oC | 51414G | ||
| Fluorocarbon (FKM, GF-type) | Black | 75 | -10 to +200oC | 514141 | |
| Hydrogenated Nitrile (HNBR) | Black | 70 | -30 to +180oC |
High temperatures, moderate fuel resistance |
88625 |
PTFE Grade Codes
| Material Composition | >Colour | Coefficient of Friction | Temperature Range | Select for.. | PTFE Reference |
|---|---|---|---|---|---|
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Virgin PTFE |
White | 0.05/0.08 | -240 to +200oC | Static or low duty cycles | E400 |
| Glass and MoS2 reinforced PTFE |
Grey/Black | 0.06/0.10 | -160 to +290oC |
Dynamic or static, medium duty cycles, hardened metal running surfaces |
E431 |
| Graphite reinforced PTFE | Black | 0.06/0.10 | -200 to +250oC |
Dynamic, medium duty cycles |
E471 |
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Carbon and graphite reinforced PTFE |
Black | 0.08/0.12 | -200 to +250oC | Dynamic, medium duty cycles | E462 |
| Polyester reinforced PTFE | Beige | 0.08/0.12 | -130 to +290oC |
Dynamic or static, medium to high duty cycles, minimum 45 HRc running surface |
E491 |
| Carbon, graphite and PPS reinforced PTFE |
Grey/Black | 0.08/0.12 | -130 to +290oC |
Dynamic or static, high duty cycles, hardened metal running surfaces |
E282Z |