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ANSI A135.4 Basic Hardboard (2020)
ANSI A135.5 (R2020) covers requirements and methods of testing for the dimensions, squareness, edge straightness, and moisture content of prefinished hardboard paneling and for the finish of the paneling. Methods of identifying products which conform to ANSI A135.5 are included. Key topics covered by ANSI A135.5 (R2020) Prefinsihed Hardboard Paneling: dimensions and tolerances physical and mechanical properties properties of hardboard paneling finishes. NOTE: This Standard may be revised or withdrawn at any time.



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