A single pack waterproof polyurethane adhesive
Purbond is a new adhesive manufactured for bonding timber, semi-porous and non-porous surfaces.
Features of Purbond are
- high adhesive strength
- no long term creep in stressed joints
- suitable for use on damp surface
- can be applied direct from the bottle
- application is to one surface only, coverage 200-250ml per square metre
- invisible in close fitting glue joints
- contains no volatile or flammable ingredients
- sand easily and does no blunt cutting tools
- 100% waterproof, withstands 72 hour boiling water test. Sets in 1-2 hours, fully cured in 24 hours
- Can be used as a waterproof replacement for ‘Bond Crete’ for concrete screeding.
300 x 200 ironbark beam boxes – Using Purbond @ Australian Architectural Hardwoods
Technical Data
Purbond is a moisture curing, 100% solids, polyurethane adhesive. It reacts with surface moisture on any substrate, especially semi-porous 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 used as a bedding adhesive.
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.
Purbond is recommended for wooden boat building applications including both timber laminating and cedar strip planking, where its ease of use will be particularly appreciated. It is suitable for all interior and exterior joinery and fitting out, and wherever surfaces are imperfectly mated. It is not recommended for gap filling of open joints, where the glue can expand out of the joint, or for joints subject to forces of peel or direct tension. For such applications, use one of our Epoxy adhesives.