Polyurethane Coating YouTube.
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Polyurethane Wikipedia the free encyclopedia.
Jump to navigation search. Polyurethane synthesis wherein the urethane groups NH-CO-O link the molecular units. Polyurethane PUR and PU is a polymer composed of organic units joined by carbamate urethane links. While most polyurethanes are thermosetting polymers that do not melt when heated thermoplastic polyurethanes are also available. Polyurethane polymers are traditionally and most commonly formed by reacting a di or poly isocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain on average two or more functional groups per molecule. Some noteworthy recent efforts have been dedicated to minimizing the use of isocyanates to synthesize polyurethanes because the isocyanates raise severe toxicity issues.
Long distance bicycle travelers usually choose tent with a high waterproof rating. Several tents from the UK manufacturer Terra Nova are among the highest rated tents in terms of waterproof ability. The PU polyurethane coating is one of the strongest and most abrasion-resistant kinds of coating but manufacturers usually don't tell what coating they use so you'll need to contact them to find out. PU optimizes the waterproofness and strength while still being light-weight. Manufacturers can maximize the amount of coating only to a certain point. More coating means more weight and more cost. Also chemicals in coating weaken the fibers so at some point increasing the water column value too much will decrease the fabric strength. This is why 10000 is the highest value you can find.
FAQ Acrylic Polyurethane and Silicone Proofing Techniques.
Technically the silnylon fabric is double-coated. That is a coating of silicone polyer has been applied to both sides. Well fair enough but there is a huge difference in the result between PU and silicone coating. The PU coating sits on the surface of the fabric but the silicone polymer goes right in. As far as I can see with a microscope the silicone polymer completely permeates the fabric fibers and forms a layer right through the fabric. As far as the final fabric properties are concerned you should not think of silnylon as a coated fabric but rather as nylon-fabric-reinforced silicone polymer sheet. This is a bit like fibreglass or glass-reinforced epoxy. This difference translates into mechanical properties too. A key parameter is tear strength.
PU coating on Tent? Yahoo Answers.
PU coating on Tent? We have just bought a tent from Argos and it says it has a PU coating what exactly does this mean? That it is waterproof/showerproof/fireproof? Any info would be much appreciated! Update Thank you that is good to know! Are you sure that you want to delete this answer? Sorry something has gone wrong. Best Answer PU Coated means te nylon fabric has been coverd in waterproofing. It isnt however fireproof unless it says it.
Soft grade high breathable and water proof. One-component PU for top layer coating PVC tapping is suitable. Base Coating Use Type. High solid content high breathable and water proof. Soft grade high water resistant breathable and water proof. good flexing at low temperature. High solid content high breathable and water proof soft gradewater. pressure resistance and nice touch.