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pot life. For this reason, do not use foam or glass mixing containers. If a pot of mixed epoxy begins to exotherm (heat up), quickly move it outdoors. Avoid breathing the fumes. Do not dispose of the mixture until the reaction is complete and has cooled. 5.3.4 Adding fillers and additives Fillers Using WEST SYSTEM® Epoxy 37 CONSISTENCY Unthickened Slightly thickened Moderately thickened Maximum thickness “SYRUP” “CATSUP” “MAYONNAISE” “PEANUT BUTTER” GENERAL APPEARANCE CHARACTERISTICS Drips off vertical surfaces. Sags down vertical surfaces. Clings to vertical surfaces. Peaks fall over. Clings to vertical surfaces. Peaks stand up. USES Coating, “wetting-out” before bonding, applying fiberglass, graphite and other fabrics. Laminating/bonding flat panels with large surface areas, injecting with a syringe. General bonding, filleting, hardware bonding. Gap filling, filleting, fairing, bonding uneven surfaces. Figure 5-6 Epoxy can be thickened to the ex- act consistency needed for a particular job. The procedures in this man- ual refer to four com- mon consistencies; syrup, catsup, mayon- naise and peanut butter. After selecting an appropriate filler for your job (Section 5.2.2), use it to thicken the epoxy mixture to the desired consistency. The thickness of a mixture required for a particular job is controlled by the amount of filler added. There is no strict formula or measuring in- volved—use your eye to judge what consistency will work best. Figure 5-6 gives you a gen- eral guide to the differences between unthickened epoxy and the three consistencies referred to in this manual. Always add fillers in a two-step process: 1. Mix the desired quantity of resin and hardener thoroughly before adding fillers. Begin with a small batch—allow room for the filler. Figure 5-7 Blend in small handfuls or scoops of the appropriate filler until the desired consis- tency is reached. 2. Blend in small handfuls or scoops of the appropriate filler until the desired consistency is reached (Figure 5-7). For maximum strength, add only enough filler to completely bridge gaps between surfaces without sagging or running out of the joint or gap. A small amount should squeeze out of joints when clamped. For thick mixtures, don’t fill the mixing cup more than 1/3 full of ep- oxy before adding filler. When making fairing compounds, stir in as much 407 or 410 as you can blend in smoothly—for easy sanding, the thicker the better. Be sure all of the filler is thoroughly blended before the mixture is applied. Additives Additives are used to give epoxy additional physical properties when used as a coating. Al- though additives are blended with mixed epoxy in the same two-step process as fillers, they are not designed to thicken the epoxy. Follow the mixing instructions on the individual additive containers. 5PDF Image | Vacuum Bagging Techniques 002150
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