Colors- At one time an effort was made to color code compounds so that seals may be more easily identified in the field. This effort was not successful , but there was some changes made and there are several OEMs still using this coding.
* Green- A European standard that identifies Viton, so the ring would most likely be a metric size
* Green-An American standard that identifies HNBR, for Freon service
* Brown- An American standard that identifies Viton
* Purple- An American standard that identifies Ethylene Propylene
* Rust/Orange- Pretty much universal for Silicone
* Blue- Pretty much universal for Fluorosilicone
* China Red-An American standard that identifies Neoprene
* Gray-An American standard that identifies Buna-N
* Clear- This indicates a very pure, probably medical grade, silicone
For the most part however, with the exception of Silicones, synthetic rubber is not black at random. The optimum physical properties are achieved by reinforcing fillers of which carbon black is the best of those materials in optimizing properties.
a little more info:
Silicone- The only inorganic rubber and thus the best aging and nonleaching characteristics.The broadest temperature range,going from -100°F thru +550°F, but relatively poor physical properties and unexceptional chemical compatibility. In medical applications it is cured with a platinum cure system which results in a complete cross linkage in the molecular chain thus there is zero leaching to contaminate any system. Hardness 25 thru 80
Fluorosilicone- Take Silicone and fluorinate it and you have a material with the combination of silicone's temperature range and Buna-N's chemical compatibility. Identified by a blue color but very expensive Hardness 40 thru 80
* Green- A European standard that identifies Viton, so the ring would most likely be a metric size
* Green-An American standard that identifies HNBR, for Freon service
* Brown- An American standard that identifies Viton
* Purple- An American standard that identifies Ethylene Propylene
* Rust/Orange- Pretty much universal for Silicone
* Blue- Pretty much universal for Fluorosilicone
* China Red-An American standard that identifies Neoprene
* Gray-An American standard that identifies Buna-N
* Clear- This indicates a very pure, probably medical grade, silicone
For the most part however, with the exception of Silicones, synthetic rubber is not black at random. The optimum physical properties are achieved by reinforcing fillers of which carbon black is the best of those materials in optimizing properties.
a little more info:
Silicone- The only inorganic rubber and thus the best aging and nonleaching characteristics.The broadest temperature range,going from -100°F thru +550°F, but relatively poor physical properties and unexceptional chemical compatibility. In medical applications it is cured with a platinum cure system which results in a complete cross linkage in the molecular chain thus there is zero leaching to contaminate any system. Hardness 25 thru 80
Fluorosilicone- Take Silicone and fluorinate it and you have a material with the combination of silicone's temperature range and Buna-N's chemical compatibility. Identified by a blue color but very expensive Hardness 40 thru 80
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