Engineered wood is an application field that requires adhesive solutions with a high contribution to sustainability. Because of this, we've developed LOCTITE PURBOND adhesives with the latest technology. The result is a solution that is both good for the environment and more safe for workers. Find more information about the technological background of our fast curing and odorless adhesive solutions in the following.
LOCTITE Purbond: Quality adhesive solutions for load bearing wood construction
Because all adhesives used in glulam construction are petrochemical-based (derived from petroleum and natural gas), they are not renewable. Achieving a given level of performance with Loctite Purbond adhesives requires smaller quantities than with competing systems, and thus means a saving of these precious resources. Loctite Purbond adhesives contain no VOCs (volatile organic solvents) or water-soluble ingredients that can pollute the environment.
The chief environmental benefit of Loctite Purbond adhesives, however, is that they help promote the use of wood, which is superior to all other materials in terms of sustainability and resource depletion, and open up new potential uses for it in critical applications.
The chemically reactive ingredient in 1C polyurethane adhesives is methylene diphenyl diisocyanate (MDI).
Like all chemicals that readily take part in chemical reactions, this substance demands protective measures when 1C PUR adhesives are used. MDI has the great advantage that its vapor pressure is very low. At ordinary process temperatures, the maximum possible concentration of MDI in the air is so slight that it poses virtually no risk to health.
Extensive workplace measurements with Purbond adhesives have shown that the level present is less than 1/100 of the required MWC (maximum workplace concentration). Persons especially prone to allergies must, however, take special precautions when working with products containing isocyanates.
Purbond furnishes its partners with ample documentation on the use of Loctite Purbond products and their properties in the cured condition. We also seek to ensure that our customers can use our new and innovative technology in a correct and economical way.
One-component polyurethane (1C PUR) adhesives are classed as reactive adhesives. The curing of these products - the formation of a strong bond capable of bearing the required loads - involves a chemical reaction. A modern adhesive must have a long shelf life but must cure in a very short time when used. Reactive adhesives meet this standard because during or just before application, a second component is mixed in to initiate the chemical reaction.
This is the case with 1C PUR adhesives as well, but it needs not be a concern for the user, because the second component is moisture, and moisture is normally present in adequate quantity in the atmosphere and particularly in wood. The adhesive can be applied directly from the container, and the curing reaction begins as soon as it comes into contact with moisture.
Polyurethane technology for load-bearing glulam construction was pioneered in the 1980s by Purbond in Switzerland. The first PUR adhesive for producing glulam structural elements have been approved by Purbond in 1994 in Germany. Despite this relatively brief history, the technology has acquired a significant market share in Europe because it offers many advantages over classical formaldehyde-based adhesives.
- One-component system - no need to meter and mix additives
- No formaldehyde or solvents - 100% solids content (satisfies JAIA F****)
- No odors - clean work environment
- No visible bondlines - excellent aesthetic effect
- First-rate bond strength and reliability - ductile behavior
- Very short curing times - no additional thermal acceleration needed
- Extremely high process reliability - unique temperature and moisture tolerance
- Excellent process economics - small application quantities, gram precision
- Less wear on milling tools - prolonged tool life
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