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Select your reinforcement Choosing reinforcement is an important decision for any laminate, but there are additional considerations when choosing one for infusion. While all fabrics will potentially infuse, different materials and weave styles can severely alter resin flow rates. The following offers some general guidelines for choosing materials, though individual experiences may vary. Fiberglass is the most frequently used reinforcement in vacuum infusion. Most fiberglass fabrics offer high permeability, allowing resin to easily flow through. In general, looser weaves tend to infuse better, as there is less crimping of strands. When using a non-woven mat, continuous strand mat will offer superior infusion over a chopped- strand. While both offer high permeability, the binder in chopped strand mat somewhat hinders resin flow. Continuous strand mat (#251) will avoid this problem. Knit fabrics are frequently used for infusion due to their construction. These fabrics are not woven, but rather are knit together to avoid crimping caused by weaves. The #293 Knit Fabric is 18 oz. fiberglass roving knit to a 1.5 oz. chopped strand mat. This material not only boosts resin flow, but also adds strength and bulk very quickly. Carbon Fiber (Graphite) and Kevlar® reinforcements can also be used in vacuum infusion, though they tend to infuse more slowly. To counteract this, the addition of flow media was found to greatly increase infusion rates and create successful parts using both #1110 Vinyl Ester and #2000 Epoxy resins. It is a good idea to experiment with these materials beforehand in order to properly gauge flows rates. When working with molds of a more complex shape, dry reinforcement may not readily sit flat. Super 77TM Spray Adhesive (#1404) is the recommended remedy for this problem. Spray a light layer of adhesive on the mold surface and lay down the reinforcement. This should provide enough adhesion to hold the materials in place. When used moderately, Super 77TM will not interfere with the resin infusion or curing process. Pg. 5 of 14PDF Image | Vacuum Infusion
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