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  1. Why ceramic coating always be embellished with 9H hardness?

    2017+ Impreza General Discussion Forum
    Why ceramic coating always be embellished with 9H hardness? (Youtobe : ) When people talking about ceramic coating, they always tell it is 9H ceramic coating. But do you really know why 9H? what is it originally from? Honestly speaking, 9H is short for 9 hardness, and this is the original...
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