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Step 5 Prepare for Infusion Select your resin Resin choice is another key aspect of VIP. There is a common misconception that a special “infusion resin” is required. This is simply not the case. Any resin can actually be used for infusion, though there are some general guidelines that should be considered when making a decision. One important piece of information that should be examined is the resin viscosity. Typically, lower viscosity will aid infusion, as it allows easier permeation of the reinforcement. This is not to say that higher viscosity resins will not work, but they may require more careful planning, more resin lines, and more flow media. Vinyl Ester is the most frequently used resin for vacuum infusion. At a viscosity of 275 centepoise, our #1110 Vinyl Ester is very well suited for this process. In fact, this is the same resin that is often called “infusion resin” by other vendors. Polyester resins such as #77 Molding Resin and #90 Isophthalic provide a viscosity of about 475 centepoise and will also infuse quite readily. System 2000 Epoxy offers a viscosity of 900-975 centepoise (depending on hardener choices), and therefore will tend to infuse a bit slower. However, don’t let that be a deterrent. High quality VIP parts were successfully created using Systems 2000 Epoxy and a variety of reinforcements. Because this resin can have a longer pot life, slower infusion times are not always a problem. Set-up considerations may include more feed lines or additional flow media. Resin Bucket Set-up Because no brushes or rollers are used in the transfer of resin, some steps must be completed to ensure that the resin line stays in the bucket, as any air entering the line could be fatal to a project. These tools include the bucket itself, a resin line holder, zip-strips, and a spring clamp. The resin line holder is basically a length of rigid material that is attached to the resin tubing via the zip-strips. Once attached, this ensures that the resin tubing stays fixed in a straight line. This eliminates the tube’s natural tendency to twist and curl. It is also helpful to cut the end of the tubing at an angle. Otherwise, the tube could potentially vacuum seal itself to the base of the bucket, preventing the flow of resin. Once attached to the holder, the line is clamped in place to the bucket. The resulting assembly should ensure that the resin line will stay exactly where it should be. Step 6 Resin Infusion Catalyze resin and allow it to infuse Once everything is in place and ready to go, mix up the resin. Double check that the resin bucket assembly is firmly in place so the tube will not leave the bucket. Once this is satisfactory, remove the flow regulator to unclamp the resin inlet. Resin should quickly be sucked through the tube and into the laminate. Pg. 10 of 14PDF Image | Vacuum Infusion
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