Adhesives for Aluminum Multilayer Pipes

In multilayer pipes, the separate layers are usually bonded using an adhesive with superior performance and excellent processing characteristics. For polyolefins, those adhesives typically consist of functionalized polyolefins which adhere well to the polyolefin layer and bond via their functionality to polar layers.

It's important that the adhesive is properly prequalified as the application characteristics, extrudibility and other properties can vary quite substantially. Some adhesives perform well at room temperature, for instance, but because of their chemical structure or molecular weight distribution, may suffer dramatic losses in peel adhesion values at higher temperatures.

Depending on the technical demands the selection of the right adhesive to perform in an application can make the difference to whether the final product can meet the requirements or not. Another important aspect is the stabilization package of the adhesive. The application for hot and cold water is typically at higher temperatures. In order to prevent an early degradation of the adhesive, it needs to be properly stabilized and the components need to be compatible with the stabilization package of the PE resin.