Polytech Foam Products Inc.

Polytech Foam Products A Division of FAI International, Inc. Phone: (800) 888-3457 Fax: (510) 232-3721
Home Products Single Component Foam Two Component Foam Pour-In-Place Foam Order Support FAQ Tutorials Downloads Contact Us Links	Home : Support : Tutorials : Two Component Spray Foam How To Use PolyTech Polyurethane Portable Spary Foam Kits: The most common performance problems that end users encounter are dripping foam and excessive expansions from the target thickness of the project. This article will address these issues in laymen terms. The PolyTech two component spray foam kit comes with dual pressurized cylinders. One cylinder is for Resin-A and the other for Resin-B. These cylinders are factory pre-calibrated to ensure optimum performance. Polyurethane foam reactions are similar to Epoxy products. The molecular ratios between Resin-A and Resin-B must maintain a pre-determined ratio in order to achieve end product's optimum performance. To facilitate the proper flow of resins from the cylinders, end user must open the cylinder valves, both Resin-A and Resin-B, fully. The spray gun must be triggered fully during application. The phenomenon of mixed dripping resins from overhead or vertical surface during application is caused by over-spraying. Without the presence of blowing agents in the formulation, the liquid density of mixed resins is approximately nine (9) pounds per gallon. If too much resins are sprayed (applied) during one pass on a vertical or overhead surface, gravitational force will pull the reacting resin down (drip) before the chemical reaction is completed and the foam solidified. It is imperative that end user will only wet the substrate surface slightly with the mixed resins initially. Upon spraying, the chemical reaction will be initiated and the sprayed foam will achieve full rise within thirty(30) seconds. End user will keep on making thinly applied sprayed layers until desired thickness is achieved. This is the only solution for the dripping resin problem. The excessive expansion of cured foam is also associated with over-spraying. One of the byproduct of polyurethane foam reaction is gaseous carbon dioxide. In conjunction with the blowing agents in the formulation, the combined gases enable the foam to expand properly. However, it takes time for the reacting resins to achieve full expansion. If end user is impatient and keeps injecting mixed resins onto the traget area, over expansion will be resulted. If the target area is confined, this will create a new problem for the end user. Reacting foam always floats to the top. As more mixed resin is injected into a confined target area, the curing foam will prohibit the newly injected resin at the bottom to rise and expand properly. The end result is foam with a much higher density than desired. The intended yield of the foam kit will significantly be decreased. A serrated edge knife is the most effective tool to trim undesirable excessive foam. If end user wishes to have finite control of final foam thickness, multiple thin layers should be applied until desired thickness is achieved.
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How To Use PolyTech Polyurethane Portable Spary Foam Kits:

The most common performance problems that end users encounter are dripping foam and excessive expansions from the target thickness of the project. This article will address these issues in laymen terms.

The PolyTech two component spray foam kit comes with dual pressurized cylinders. One cylinder is for Resin-A and the other for Resin-B. These cylinders are factory pre-calibrated to ensure optimum performance. Polyurethane foam reactions are similar to Epoxy products. The molecular ratios between Resin-A and Resin-B must maintain a pre-determined ratio in order to achieve end product's optimum performance. To facilitate the proper flow of resins from the cylinders, end user must open the cylinder valves, both Resin-A and Resin-B, fully. The spray gun must be triggered fully during application. The phenomenon of mixed dripping resins from overhead or vertical surface during application is caused by over-spraying. Without the presence of blowing agents in the formulation, the liquid density of mixed resins is approximately nine (9) pounds per gallon. If too much resins are sprayed (applied) during one pass on a vertical or overhead surface, gravitational force will pull the reacting resin down (drip) before the chemical reaction is completed and the foam solidified.

It is imperative that end user will only wet the substrate surface slightly with the mixed resins initially. Upon spraying, the chemical reaction will be initiated and the sprayed foam will achieve full rise within thirty(30) seconds. End user will keep on making thinly applied sprayed layers until desired thickness is achieved. This is the only solution for the dripping resin problem. The excessive expansion of cured foam is also associated with over-spraying. One of the byproduct of polyurethane foam reaction is gaseous carbon dioxide. In conjunction with the blowing agents in the formulation, the combined gases enable the foam to expand properly. However, it takes time for the reacting resins to achieve full expansion. If end user is impatient and keeps injecting mixed resins onto the traget area, over expansion will be resulted. If the target area is confined, this will create a new problem for the end user. Reacting foam always floats to the top. As more mixed resin is injected into a confined target area, the curing foam will prohibit the newly injected resin at the bottom to rise and expand properly. The end result is foam with a much higher density than desired. The intended yield of the foam kit will significantly be decreased. A serrated edge knife is the most effective tool to trim undesirable excessive foam. If end user wishes to have finite control of final foam thickness, multiple thin layers should be applied until desired thickness is achieved.