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| At BT, We distribute O ring, Seals, Hydraulic and industrial components, and system, providing motion control solution for everything thats moves. |
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Gutor |
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Technical Information |
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O-Ring Definition |
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O-rings : An elastrometic seal of hemongenous composition molded in one piece to the configuration of tortuous with a circular cross section. |
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The O-ring is used as a dynamic or static seal, usually installed in a machined groove. |
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Type of Seals |
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Static Seal |
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A seal form between mating parts that do not move relative to each other. |
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*Axial Squeeze |
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Side to side compression |
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*Radial Squeeze |
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I.D/O.D compression |
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Dynamic Seal |
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A seal in each one or more of the mating components that move relative to each other. |
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*Reciprocating |
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axial movement |
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*Rotatory |
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curvalinear movement |
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Common Rubber Terms |
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Parting Line |
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A ridge on the parts where the mold plates meet |
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Flash |
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The cross section of residual rubber formed at the mold parting line |
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Shrink |
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The dimensional change that occurs in a rubber parts as it cures during molding. 2%- 4% during molding, additional 1% if post cured |
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Hardness |
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Durometer point shore "A" or IHRD - 70 shore "A" are the most widely used |
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Compression Set |
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A measurement of the loss of recovery when tested at a specified deflection, temperature and time |
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Tensile Strength |
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The force required to rupture a specimen |
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Modulus |
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The forced required to reach a predetermined deformation |
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O-Ring Design |
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The best O-Rings in the world wont work if the gland they are in isn't designed right. |
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probably 20-50% of all leakage problems are a problem with gland design |
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- The remainder are caused by poor seal material selection,seal damage and / or reaching the end of seal's service life (if they wear out) . |
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