There are various coatings for piston rings, each having a particular application.
Blow are some common coatings we usually do for piston rings
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Chrome
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Ceramic Chrome(CKS)
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Chrome Insert
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Sand Blasting
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Phosphate
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Tin Plating
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Cooper Plating
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Cooper Insert
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Ferric Oxide Filling
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Molybdenum Coating
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Alu Coating