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PITTSBURGH–(BUSINESS WIRE)–PPG (NYSE: PPG) today announced that its PPG PSX™ polysiloxane coatings have been tested successfully by an independent, third-party laboratory to the requirements for C4H (or high C4) certification under the ISO 12944-6:2018 international standard for corrosion protection of steel structures by paint systems. Under this standard, an exposure environment classified as C4 is described as highly corrosive. Such environments include industrial and coastal areas with mo
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