3M™ Scotch-Weld™ DP8005 Plastic Structural Adhesive

3M DP8005 (Scotch-Weld DP8005) is a two-part acrylic structural adhesive designed for one specific use: bonding low surface energy plastics such as polypropylene (PP) and polyethylene (PE), without primer or prior surface treatment.

Available pack sizes

• 45 ml: cartridge, in white or black.
• 490 ml: beige.
• 2 x 2 L: transparent.
• 10 L: white, for production.

The problem it solves

PP and PE are known as impossible to bond. Their surface energy is so low that most adhesives spread poorly, do not wet the substrate and end up peeling off in one piece. The usual solution is to treat the surface (flame, plasma, corona) or apply a primer.

DP8005 is formulated to adhere directly to these plastics. A process step is removed, and with it a source of error.

Two-part: how to apply it

The adhesive and its hardener are packed separately and mix at the moment of application. The cartridge format is used with an applicator gun and a static mixing nozzle: the cartridge provides the ratio, the nozzle the mixing.

Discard the first few centimetres from each new nozzle, until the mix is uniform. A nozzle sets once the adhesive cures: replace it each time you restart after a break.

Typical uses

Tanks, housings, injection-moulded PP or PE parts, assemblies of engineering plastics and composites. For metal-to-metal assemblies, a two-part epoxy adhesive is generally more suitable.

See also our two-part plastic adhesives and our two-part acrylic adhesives.