Is the yellow color of the inner and outer rings of the gasket due to galvanizing of carbon steel?
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Is the yellow color of the inner and outer rings of the gasket due to galvanizing of carbon steel? What is green in the inner and outer rings? Are the last two images of the type without inner and outer rings, or are the inner and outer rings too narrow?
Green might be the anti-corrosion coating. The latter two types do not have inner or outer rings; they are made by winding steel strips around graphite. To ensure that the pad remains stable and does not deform, there are several layers of steel strips at the innermost and outermost edges that do not contain graphite, and these layers are welded together