Preliminary Report on Test Method for Evaluating Gluability of Hardboard

A method of determining the gluability of hardboards is considered essential as this material becomes more widely used in the manufacture of secondary products. A tentative method, involving a gluability index, was developed for testing this characteristic and was applied to the standard and treated products of three manufacturers. Two adhesives, a casein and a urea formaldehyde, were used to bond the two surfaces of the board in several orientations: face-to-face, back-to-back, and face-to-face after sanding. In order to determine the feasibility of the test method, the gluing conditions had to be standardized; the particular conditions chosen for this study, therefore, may not have been optimum for all boards. However, the two glues as applied appeared to have differing reactions on the treated and untreated boards and these reactions varied with the different manufacturer’s products. Interactions of glue type and manufacturer with surface orientation also appeared evident. The data as collected appeared to require a transformation before analysis of variance procedures could be applied, but the most appropriate form for this data was not determined. It was found that the ideal situation of independence of the gluability index from the physical properties of the board was not completely attained. Treated boards appeared to affect the index in proportion to their inherent strengths.

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