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WEST SYSTEM EPOXY RESIN

WEST SYSTEM EPOXY RESIN

REF: AD08100

West System 105/205 is recognised as a premium marine epoxy, West 105/205 Resin is ideal for most bonding applications and is recommended for&nbs... Read More

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West System 105/205 is recognised as a premium marine epoxy, West 105/205 Resin is ideal for most bonding applications and is recommended for critical situations. Not only will it bond well to most timbers it can be used also with fibreglass, foam, composite materials and wide range of metals. Can be used in many timber repair applications.

West 105/205 Epoxy can be thickened with West Fillers to fill gaps and voids and can be sanded when cured. Multiple layers of West Epoxy will form a superior coating and is suitable as a base for paints and varnishes.

Available in:

  •     West A Pack 1.2kg
  •     West B Pack 6kg

Overview

105 West Epoxy Resin

105 Resin is a clear, low-viscosity liquid epoxy resin. Formulated for use with one of four West System hardeners, it can be cured in a wide temperature range to form a high-strength solid with excellent moisture resistance.

105 Epoxy Resin, when mixed at the proper ratio with a West System hardener is an excellent adhesive. It is designed specifically to wet out and bond to wood fiber, fiberglass, reinforcing fabrics, foam other composite materials and a variety of metals. 105 Resin-based epoxy will bridge gaps and fill voids when modified with West System fillers and can be sanded and shaped when cured.

105 Resin is formulated with volatile solvents and does not shrink after curing. It has a relatively high flash point and no strong odor, making it safer to work with than polyester or vinylester resins. 


205 Fast Hardener

205 Fast Hardener is formulated for general coating and bonding applications at lower temperatures and to produce a rapid cure that develops its physical properties quickly at room temperature. 105/205 forms a high-strength, moisture-resistant solid with excellent bonding and barrier coating properties. Not intended for clear coating.


Mix Ratio: 5 Parts Resin: 1 Part Hardener

Pot Life at 72°F (22°C): 9 to 12 Mins

Cure to a Solid State: 6 - 8 Hrs

Cure to working strength: 1 - 4 days

Min. recommended temp. 40°F (4°C)

Preparation

Whatever you are bonding the success of the application depends not only on the strength of the epoxy but also on how well the epoxy adheres to the surface to which it is being applied. Unless you are bonding to partially cured epoxy, the strength of the bond relies on the epoxy's ability to mechanically "key" into the surface. That is way the following three steps of surface preparation are critical part of any secondary bonding operation.

For good adhesion, bonding surfaces should be:

1 - Clean - Bonding surfaces must be free of any contaminants such as grease, oil, wax or mold release. Clean contaminated surfaces with lacquer thinner, acetone or other appropriate solvent. Wipes the surface with paper towels before the solvent dries. Clean surfaces before sanding to avoid sanding the contaminant into the surface. Follow all safety precautions when working with solvents.

2 - Dry - All bonding surfaces must be as dry as possible for good adhesion, if necessary accelerate drying by warming the bonding surface with hot air gun, hair dryer or heat lamp. Use fans to move the air in confined or enclosed spaces. Watch for condensation when working outdoors or whenever the temperature of the work environment changes.

3 - Sanded - Sand smooth non-porous surfaces - thoroughly abrade the surface 80g aluminum oxide paper will provide a good texture for the epoxy to "key" into. Be sure the surface to be bonded is solid. Remove any flaking, chalking, blistering or old coating before sanding. Remove all dust after sanding.


Dispensing & Mixing

Careful measuring of epoxy resin and hardener and thorough mixing is essential for a proper cure. Whether the resin/hardener mixture is applied as a coating or modified with fillers or additives, observing the following procedures will assure a controlled and thorough chemical transition to a high-strength epoxy solid. 

Dispensing

Dispense the correct proportions of resin and hardener into a clean plastic, metal or wax-free paper container. Don't use glass or foam containers because of the potential danger from exothermic heat buildup.

Do not attempt to adjust the epoxy cure time by altering the mix ration. An accurate ratio is essential for a proper cure and full development of physical properties.

Dispensing with Pumps

To simplify dispensing and reduce the possibility of errors we recommend using calibrated West System Pump Sets to meter the correct working ration of resin to hardener.

PUMP ONE FULL PUMP STROKE OF RESIN FOR EACH ONE FULL PUMP STROKE OF HARDENER. Depress each pump head fully and allow the head to come completely back to the top before beginning the next stroke. Partial strokes will give the wrong ration. Read the pump instructions before using pumps.

Before you use the mixture on a project verify the correct ration according to the instructions that come with the pumps. recheck the ration anytime you experience problem when curing.

Dispensing without pumps - weight/volume measure

To measure 105 resin  and 205 hardener by weight or volume combine 5 parts resin with 1 part hardener. 

Mixing

Stir the two ingredients together thoroughly at least 1 minute longer in cooler temperatures. To assure thorough mixing, scrape the sides and bottom of the pot as you mix. Use the flat end of the mixing stick to reach the inside corner of the pot. If you are using a power mixer occasionally scrape the sides and corners of the mixing pot while mixing. If you are going to be using the mixture for coating quickly pour it into a roller pan to extend the open time. 

Storage

Store at room temperature. Keep containers closed to prevent contamination. With proper storage, resin and hardeners should remain usable for many years. After a long storage, verify the metering accuracy of the pumps. Mix a small test back to assure proper curing.

Over time 105 Resin will thicken slightly and will therefore require extra care when mixing. Repeated freeze/thaw cycles during storage may cause crystallization of 105 Resin. Warm resin to 125°F and stir to dissolve crystals.

Hardeners may darken with age but physical properties are not affected by colour. If clear finishing be aware of a possible colour shift if very old and new hardeners are used on the same project. 

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