Elastomeric Adhesives . . . Their Uses in Forest Products

Numerous types of elastomeric adhesives are commercially available. A few of the more general types are as follows: contact cement, emulsified contact cement, and rubber-asphalt. A typical bonding application is rigid metal bonded to lignocellulosics. A rigid metal is defined as being 0.006 inch or greater in thickness. Metals thinner than this are considered to be foils. Rigid metals glued to plywood is the first utilization of an elastomeric adhesive where wood was represented as one of the components. A casein-latex will set up at room temperature after a pressure period of several hours, or can be cured under heat and pressure within a few minutes. Spreads of 15 to 35 pounds per 1000 sq.ft. of single glue line are adequate to provide a water-resistant bond. Other applications include metal foil bonded to ligno-cellulosics, high density overlays bonded to ligno-cellulosics, thin flexible sheets bonded to ligno-cellulosics, paneling bonded to rigid substrates, and edge gluing lumber and veneers.

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