Ruichen Sealing Co., Ltd.
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We usually show an o-ring as ID*CS, ID is short for inner diameter, CS is short for cross section. Some one also show an o-ring as OD*CS, OD is short for outer diameter, CS is short for cross section.
So there is a formula for o-rings. OD=ID+2*CS, or ID=OD-2*CS.
And what an o-ring looks like ? You can see as bellow.
AS568 standard usually share the same CS (cross section), the value of CS usually is 1.78mm, 2.62mm, 3.53mm, 5.33mm or 6.99mm. But ID (inner diameter) are very different, from 0.74 mm to 658.88 mm.
AS 568 standard
Commonly used black, also can be Red,green,blue,yellow and so on，you can also send me a color NO.
Duro 30 to 90 Shore A
+/-5 Shore A
-40 ℃ to 100 ℃
NBR also named as nitrile rubber, buna-N. It is the most widely used elastomer in the seal industry today. Advantages including Excellent Abrasion-Resistance, Good Rebound Resistance, Good Tensile Strength and Elongation, Excellent Animal and Vegetable Oil Resistance, Good Oil and Fuel Resistance, Good Water Resistance. But it is not good at Oxygenated-Solvent Resistance and Ozone Resistance.
What is the uses ?
NBR o rings can be used for fuel spray nozzles, electric power tools, oil tanks,
air pumps, pneumatic components, oil hydraulic pump and so on.
But NBR parts should be kept from direct sunlight, So when the seal needs to be exposed, it is not suitable to use NBR as raw material.
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