When mixing epoxy resin, accurate measurement of components and a suitable container are important. Mixing until uniform consistency is key, and the environment should be controlled to avoid heat or cold. Safety precautions include wearing gloves and eye protection in a well-ventilated area.
Epoxy is a very useful thermosetting polymer that is often used as a long lasting and durable adhesive and sealant. The process of mixing epoxy resin can be delicate, so some things that will help it be more effective are precise measurement of the components; using a paper, metal or polyethylene container; and work in an environment that is neither too hot nor too cold. It’s also important to be careful when handling the chemicals involved in mixing epoxy, because they can be toxic.
The most important aspects of working with epoxy resin are also the mixing and use of accurate proportions of the components. Epoxy should be mixed until it is of a uniform consistency – unmixed pockets of resin or hardener will not cure properly and will weaken the joint. Also, mixing epoxy is essentially a controlled chemical reaction, and if the resin-to-hardener ratio is incorrect, the epoxy may not cure properly or may be very difficult to handle. To make sure the resin and hardener quantities are accurate, it is good practice to use a measuring cup to dose large quantities. If the container used for measuring is not the same one used for mixing, it is important to scrape off all of the hardener or resin to maintain the correct proportions.
The type of container used for the epoxy mix will also affect the cure: unwaxed paper, metal, and polyethylene are good material choices, because they won’t contaminate the epoxy mix. Disposable paper and metal containers can be purchased relatively cheaply or made from readily available materials, such as cardboard or aluminum foil. The conductive metals will help spread the heat released by the chemical reaction of the two components, slowing the cure and allowing for a longer working time with the epoxy. Polyethylene containers are suitable for repeated use, because well-mixed epoxy does not stick to them after curing. Do not use glass, expanded polystyrene, and waxed paper products, as the heat of the reaction can release contaminants into the epoxy and melt or shatter them.
The reaction that cures epoxy involves heat, so the temperature of the mixing environment should be controlled. Excessive heat will speed up the cure and cold may prevent the epoxy from reacting properly. For safety reasons, mixing the epoxy resin should be done in a well-ventilated area so that the fumes can be easily dispersed. Wearing eye protection and gloves is also recommended, especially when working with large quantities that may splash or spill.
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