Why do pan-plug seals have so many colors

The casing of the pan plug seal is black, white, white transparent, yellow, blue, dark green, and so on. Can be described as a rainbow of colors. So why are there so many colors?

The wide range of “wide” means not only that it is widely used. It also shows the wide range of materials, pure PTFE is white, modified PTFE is added modified substances, modified materials are carbon fiber (black), polyphenyl ester (earthy yellow), polyimide (yellow), bronze powder (cyan green) and so on.

These fillers have their own color. When added, it will favor this color and make the casing of the pan-plug seal colorful. For example, there are 45# steel, A3 steel, 301,304,316 stainless steel, etc., which are mixed and refined from different proportions of metals. Performance can vary,

The selection of materials under each working condition can get twice the result with half the effort. Engineering plastics are the same, and different colors are different materials or formulas. The place of use is different.