A new structural adhesive from Skigrip, Durham, N.C., joins low-surface-energy thermoplastics such as PP and PE. A two-part acrylic-based adhesive, PPX5 has been shown to effectively bond polyolefin substrates with little or no surface preparation, does not require primers, yields a bond with excellent resistance to water and humid environments, and cures at room temperature.
Polyolefins are difficult to bond because their surfaces repel most adhesives. This adhesive presents a bonding alternative to mechanical assembly, heat/vibration welding, or solvent welding. It is a two-part system (50-ml cartridges) with working time of 2 to 4 min, and fixture time of about 90 min. The off-white adhesive is reportedly resistant to most automotive and industrial solvents, including ethylene glycol, brake fluid, power-steering fluid, and isopentane. It can be used to bond dissimilar plastics (PP, PE, PC, and PMMA), fiber-reinforced plastics, and metals with a minimum of surface preparation. Adhesion properties include shear strength of 500 to 870 psi for thermoplastics to thermoplastics and 500 to 940 psi for PE to metals.
(919) 598-2400 • skigrip-americas.com