G/flex 650 is a toughened, versatile, liquid epoxy for permanent waterproof bonding of fiberglass, ceramics, metals, plastics, damp and difficult-to-bond woods. With a modulus of elasticity of 150,000 PSI, it is a bit more flexible than standard epoxies and polyester, but much stiffer than adhesive sealants. This gives G/flex 650 the ability to make structural bonds that can absorb the stress of expansion, contraction, shock, and vibration. It is ideal for bonding dissimilar materials. It can be modified with WEST SYSTEM fillers and additives, and used to wet-out fiberglass tapes and fabrics. Mixed at a 1:1 ratio, G/flex 650 gives you 46 minutes of pot life at 72°F, and an open (working) time of 75 minutes. It reaches an initial cure in 3 to 4 hrs and a workable cure in 7-10 hours.
G-flex Technical Data (pdf)
Benefits of G/flex 650 Epoxy
Toughness and flexibility
G/flex has been toughened. This gives it the ability to make structural bonds that can absorb the stresses of expansion, contraction, shock, and vibration. This epoxy is resilient and impact resistant. With a modulus of elasticity of 150,000 psi (WEST SYSTEM 105 Resin/205 Hardener has a modulus of elasticity of 450,000 psi), G/flex is more flexible and can deflect further before breaking than WEST SYSTEM 105/205, while being much stiffer than typical adhesive sealants.
Adhesion to wet and damp surfaces
G/flex has the ability to glue damp woods. It can be used on wet surfaces, even underwater when applied with specific techniques.
Excellent adhesion to hard-to-bond woods
G/flex adheres tenaciously to difficult- to-glue hardwoods, both tropical and domestic varieties. This is important since many of the exotic and tropical species now being used to replace traditional woods present bonding challenges.
Bonds well to a variety of materials
G/flex is ideal for bonding a variety of materials, including dissimilar ones. It has has a superior grip so that it can be used to bond to metals, plastics, glass, masonry, and fiberglass. This epoxy is ideal for repairs to aluminum boats and polyethylene and ABS canoes and kayaks. It can also be used to wet out and bond fiberglass tapes and fabrics.
Ease of use
G/flex is a simple two-part epoxy system. Resin and hardener are mixed in a 1-to-1 mix ratio by volume. It provides a relatively long open working time, yet it cures quickly and can be used in cool temperatures. Because it is simple to mix and use, this 2-part epoxy is an excellent starting point for customers new to epoxy use.
G/flex can be modified with WEST SYSTEM fillers and additives if you need to meet particular bonding needs. Adding G/flex to other WEST SYSTEM epoxies can improve their toughness and flexibility.