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Purbond is a moisture curing, 100% solids, polyurethane adhesive. It reacts with surface moisture on
any substrate, especially semiporous materials, which initiates its curing reaction. In the process of this
reaction, Purbond foams and expands slightly, forcing its way into gaps, unevenness, or pores on each
of the mating surfaces, thus enhancing the contact area of the joint. It has high shear strength and is
creep resistant.
Purbond can be used for bonding most materials including timber, plywood, fibre and particle boards,
foamed plastics, concrete, even metals. While a strong bond will be formed to most substrates, it may
not be structural with all materials. The bond is stronger than all timbers softer than pine and oregon,
especially Western Red Cedar, and breaks the timber grain of them. Harder timbers will be bonded with
equal strength, but the glue line may break before the timber. In test pieces we have obtained 100%
wood failure with hard timbers such as Rosewood and Tasmanian Oak.
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