Polyurethane adhesives aren’t just construction adhesives
Two component polyurethane adhesives are used to bond materials with different flexibility or different thermal coefficients of expansion including glass to metal, fibre reinforced plastic (FRP) to metal, and aluminium to steel. This is surprising to many people because polyurethane adhesives have a fantastic reputation as wood bonding adhesives. They are not ONLY construction adhesives but specialty adhesives that are polyurethanes find uses in many industries. Following are a few diverse applications I’ve seen recently for polyurethane specialty adhesives and why they were selected:
Trailer Truck Panel Bonding and Office Furniture Bonding
Permabond’s two component polyurethanes are ideal for bonding thin metal or laminate panels as they provide excellent strength with very low shrinkage. The low shrinkage allows bonding without show-through or read-through. The fact that the adhesive bond line isn’t visible from the reverse side of the panel is a very desirable feature.
Polyurethanes are used as a process aid in the manufacture of prosthetics during the ‘build-up’ phase. The short gel time speeds this process for the person being fitted as well as for the prosthetist.
Carbon Fiber Automotive Components
Preformed bonnet (hood) shells are bonded with PT326 As a glue guru – I tend to ramble on about strength, durability, temperature resistance etc.… however, in addition to those attributes, the feature many carbon fiber bonding customers rave about is the colour.
Polyurethane adhesives are often chosen for potting sensitive electronic components, like panel bonding the low linear shrinkage prevents damage to the components during cure.
Unlike the small delicate electronic parts noted above, Heat exchanger potting areas can be quite large. Although for many types of heat exchangers, epoxies are preferred, potting large areas with epoxy can be problematic due to the shrinkage causing the walls of the pot to deform.
Thanks to it’s high impact strength and vibration resistance, PU adhesive is ideal for bonding a wide variety of composites materials found in the sports equipment industry – e.g. for rackets, posts, kite boards, kayaks to name a few.
Two component polyurethane adhesives can be formulated to set quickly to allow for high speed production or to set slowly to allow time to dispense over a large area. Specialty polyurethane adhesives are designed for various industrial applications for a large variety of substrates. I guess we can consider specialty polyurethanes construction adhesives, it is simply a matter of what you are constructing.
For further help and advice, please contact Permabond.