Medium Density Hardboard–A Leading Contender for the Siding Market

This paper outlines the development of fiber siding and compares its basic properties and application costs with wood and other materials in common use. Medium-density hardboard is a softer, lower density product than the usual hardboard. By definition it weighs 31 to 50 pounds per cubic foot (0.50 to 0.80 specific gravity). It has become a favored siding material with residential builders and homeowners, and is expanding in acceptance throughout the country. Outstanding properties for this use include good linear and thickness stability, workability, stiffness and strength, weight, water-resistance, durability, and thermal conductivity. Improved processes incorporating very rapid and accurate control methods have contributed to its success. The manufacturing processes, properties required, and quality control techniques are discussed and data tabulated.

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