WEST SYSTEM G/Flex Epoxy (2-4oz)

EXCELLENT ADHESION to hard-to bond woods. This toughened, versatile liquid epoxy for permanent waterproof bonding of fiberglass, ceramics, metals, plastics, damp and difficult-to-bond woods. A bit more flexible than standard epoxies and polyester, but much stiffer than adhesive sealants. Makes structural bonds that can absorb the stress of expansion, contraction, shock, and vibration.

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, this 2-part epoxy gives you 46 minutes of pot life at 72°F and an open (working) time of 60-75 minutes. It reaches an initial cure in 3 to 4 hrs and a workable cure in 7-10 hours.

OFFERS GREATER FLEXIBILITY than traditional epoxies or polyester resins. Yet it is much stiffer than adhesive sealants. With a modulus of elasticity of 150,000 PSI, this epoxy bonds tenaciously to a metals, plastics, glass, masonry, and fiberglass. Can also be used to wet out and bond fiberglass tapes and fabrics.

MAKES STRUCTURAL BONDS that can absorb the stress of expansion, contraction, shock, and vibration. G/flex can be used on damp or wet surfaces, and even underwater when applied with specific techniques. Perfect for repairs to aluminum and boats and canoes or kayaks made of polyethylene or ABS.

EASILY MODIFIED with WEST SYSTEM Fillers, Additives, and Pigments to suit the job at hand. Adding G/flex to other WEST SYSTEM epoxies can improve their toughness and flexibility. Not intended for clear coating.

Retail Price: $ 21.54

Wholesale Price: Inquire Now

WEST SYSTEM Specialty Epoxies

These specialty epoxies add even more versatility to the WEST SYSTEM line of epoxies.


Six10 Thickened Epoxy Adhesive Six10 Thickened Epoxy Adhesive is a two-part epoxy with a consistency similar to gel toothpaste. We manufacture it under vacuum to prevent entrapped air bubbles. Our in-house chemists formulated this toughened system with 8% elongation. Conveniently, Six10 requires no hand mixing when used with a standard caulk gun and the static mixing wand that comes with each cartridge (pictured caulk gun not included). The self-metering coaxial cartridge dispenses a gap-filling, structural adhesive that bonds tenaciously to wood, metals, fiberglass, and concrete. Six10 has a working time of over 40 minutes until the mixing wand becomes unusable. This adhesive has shear thinning properties, which means it moves more like a liquid when you work the material. This allows its use in cooler temperatures. You can also use it to wet out lightweight fiberglass cloth. It will cure in temperatures as low as 50°F (10°C).	G/flex Epoxies G/flex is a two-part, toughened epoxy that can make structural bonds which absorb the stress of expansion, contraction, shock, and vibration. We formulated this system for high elongation with an ultimate elongation of around 30%. The increase in elongation and lower modulus (stiffness) that it provides equates to better adhesion to substrates. This helps it resist a peel or delamination from starting. G/flex has a 1:1 mix ratio by volume for easy measuring. It’s also ideal for bonding dissimilar materials. We offer it in two versions. The liquid version, G/flex 650, has a consistency similar to honey. You can thicken it with 406 Colloidal Silica to reach the same viscosity as the 655. The pre-thickened version, G/flex 655, has a consistency like gel toothpaste. With proper application techniques, it will bond to wet/damp substrates and dense or oily woods like teak and oak.	G/5 Five-Minute Adhesive G/5 Five-Minute Adhesive is a two-part adhesive that will cure to a gel state within minutes. It has a 1:1 mix ratio by volume. You can wet sand it about 30 minutes after application. It is ideal for a temporary, quick cure that’s convenient for some applications like fabricating a quick custom sanding block with some scrap fiberglass cloth and a piece of foam. G/5 should not be used where high loads are expected or if it will be continually immersed in water.


	Six10 Thickened Epoxy Adhesive	G/flex 650 Toughened Epoxy	G/flex 655 Thickened Epoxy Adhesive	G/5 Five-Minute Adhesive
Mix ratio, resin:hardener	NA (dispenses at proper ratio)	1:1	1:1	1:1
Pot life @72°F	42 minutes (in static mixing wand)	45 minutes	45 minutes	3-5 minutes
Working time, thin film @72°F	42 minutes	45 minutes	45 minutes	3-5 minutes
Cures to a solid, thin film @72°F	5 to 6 hours	3 to 4 hours	3 to 4 hours	5 minutes
Cures to working strength @72°F	1 to 4 days	7 to 10 hours	7 to 10 hours	15 minutes
Minimum working temp	50°F (4°C)	40°F (4°C)	40°F (4°C)
Hardness (Shore D) ASTM D-2240	80.6	75	75
Compression yield (ASTM D-685	9,690 psi	5,270 psi	5,270 psi
Tensile strength ASTM D-638	6,440 psi	3,440 psi	5,270 psi
Flexural strength ASTM D-790	11,300 psi	5,190 psi	5,270 psi

WEST SYSTEM Epoxies

WEST SYSTEM offers high-quality epoxy resins, hardeners, fillers, and additives. Developed by our in-house chemists, our formulations are proprietary, structural, and marine grade. These epoxies have set the standard for epoxy quality in the marine industry and beyond since 1969.

An ISO 9001:2015 certified company

Founded in 1969, Gougeon Brothers, Inc. (GBI) formulates and manufactures WEST SYSTEM products. In 2020, NSF International recertified GBI's ISO 9001:2015 status, which ensures consistency in epoxy formulation, production, packaging, and instructional materials.

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WEST SYSTEM G/Flex Epoxy (2-4oz)

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Product introduction

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Product Description

WEST SYSTEM Specialty Epoxies

These specialty epoxies add even more versatility to the WEST SYSTEM line of epoxies.


Six10 Thickened Epoxy Adhesive Six10 Thickened Epoxy Adhesive is a two-part epoxy with a consistency similar to gel toothpaste. We manufacture it under vacuum to prevent entrapped air bubbles. Our in-house chemists formulated this toughened system with 8% elongation. Conveniently, Six10 requires no hand mixing when used with a standard caulk gun and the static mixing wand that comes with each cartridge (pictured caulk gun not included). The self-metering coaxial cartridge dispenses a gap-filling, structural adhesive that bonds tenaciously to wood, metals, fiberglass, and concrete. Six10 has a working time of over 40 minutes until the mixing wand becomes unusable. This adhesive has shear thinning properties, which means it moves more like a liquid when you work the material. This allows its use in cooler temperatures. You can also use it to wet out lightweight fiberglass cloth. It will cure in temperatures as low as 50°F (10°C).	G/flex Epoxies G/flex is a two-part, toughened epoxy that can make structural bonds which absorb the stress of expansion, contraction, shock, and vibration. We formulated this system for high elongation with an ultimate elongation of around 30%. The increase in elongation and lower modulus (stiffness) that it provides equates to better adhesion to substrates. This helps it resist a peel or delamination from starting. G/flex has a 1:1 mix ratio by volume for easy measuring. It’s also ideal for bonding dissimilar materials. We offer it in two versions. The liquid version, G/flex 650, has a consistency similar to honey. You can thicken it with 406 Colloidal Silica to reach the same viscosity as the 655. The pre-thickened version, G/flex 655, has a consistency like gel toothpaste. With proper application techniques, it will bond to wet/damp substrates and dense or oily woods like teak and oak.	G/5 Five-Minute Adhesive G/5 Five-Minute Adhesive is a two-part adhesive that will cure to a gel state within minutes. It has a 1:1 mix ratio by volume. You can wet sand it about 30 minutes after application. It is ideal for a temporary, quick cure that’s convenient for some applications like fabricating a quick custom sanding block with some scrap fiberglass cloth and a piece of foam. G/5 should not be used where high loads are expected or if it will be continually immersed in water.


	Six10 Thickened Epoxy Adhesive	G/flex 650 Toughened Epoxy	G/flex 655 Thickened Epoxy Adhesive	G/5 Five-Minute Adhesive
Mix ratio, resin:hardener	NA (dispenses at proper ratio)	1:1	1:1	1:1
Pot life @72°F	42 minutes (in static mixing wand)	45 minutes	45 minutes	3-5 minutes
Working time, thin film @72°F	42 minutes	45 minutes	45 minutes	3-5 minutes
Cures to a solid, thin film @72°F	5 to 6 hours	3 to 4 hours	3 to 4 hours	5 minutes
Cures to working strength @72°F	1 to 4 days	7 to 10 hours	7 to 10 hours	15 minutes
Minimum working temp	50°F (4°C)	40°F (4°C)	40°F (4°C)
Hardness (Shore D) ASTM D-2240	80.6	75	75
Compression yield (ASTM D-685	9,690 psi	5,270 psi	5,270 psi
Tensile strength ASTM D-638	6,440 psi	3,440 psi	5,270 psi
Flexural strength ASTM D-790	11,300 psi	5,190 psi	5,270 psi

WEST SYSTEM Epoxies

An ISO 9001:2015 certified company

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