PUR Adhesive - For Challenging Connections
PUR propolymer adhesives or PUR glues are one-component, duroplastic adhesives that react with the surrounding humidity and the workpieces that are to be bonded. They are some of the most innovative adhesives for Tischler/Schreiner, and are excellently suited for particularly challenging connections.
Whether you want to glue two absorbent materials or an absorbent and a non-absorbent workpiece - PUR adhesives form an excellent bond without further heating.
PUR adhesives are available in different viscosities. These range from liquid to pasty and have to be chosen according to the purpose. The more pasty adhesive is for example particularly suited for vertical bonding and is very popular for mobile use on construction sites. The more liquid variant on the other hand is more often used for larger surfaces and in the workshop.
Both variants can be applied by using a spatula. For liquid PU adhesives, it is possible to use a glue roller as well. Keep in mind to clean the application tool immediately after use with acetone or cellulose thinner, before the adhesive hardens.
Fibre-reinforced PUR adhesive? For what reason?
Some PUR adhesives are, in addition, fibre-reinforced. They are particularly suited for the construction of load-bearing, glued finger joints for interior and exterior areas. Due to the fibres, a particularly high bond strength is achieved.
Moisture and Foaming of PU Adhesives
For bonding with one-component PUR adhesives, a chemical reaction with water is indispensable. In case the adhesive cannot draw the humidity from the materials or the surrounding air, you can carefully wet the workpieces with water.
The different foaming reaction is mentioned for each PUR adhesive in the technical data sheet. Adhesives with greater foaming reaction for example are particularly suited to bond uneven surfaces that the adhesive can then seep into.
