Polyesters and polyurethanes can provide good to excellent outdoor durability. More often than not, polyurethanes have polyesters beat on chemical resistance, hardness and thin film appearance; however, this added performance almost always comes at a premium. Thanks for the cool question, Bonnie.
Kevin Biller is technical editor for Powder Coated Tough magazine. He can be reached at kevinbiller yahoo.
Posted in: Raw Materials. PC Summitry:Polyester Vs. Polyurethane Posted on Friday, March 1, By Kevin Biller One of the neatest parts of being in this industry is the fact that you sometimes get to meet really cool people. Here is a rundown of the top properties and how they compare: Exterior Durability Excellent exterior durability is possible with either chemistry.
Hardness and Abrasion Resistance Polyesters are typically somewhat softer and less abrasion resistant than their polyurethane counterparts. Low Gloss and Matte Finishes Polyurethanes can be formulated from matte to high gloss with very good to excellent coating performance. Chemical Resistance Both chemistries provide fairly good chemical resistance however polyurethanes significantly outshine polyesters if formulated appropriately.
Cure Response Low temperature cure is much easier to develop in a polyester than a polyurethane powder coating. Thin wall medical hoses i. Beginning in the early s, industry efforts to become more environmentally friendly created polyurethanes made from vegetable oil polyols, most notably soy-based polyurethane used by Ford Motor Company in recent automobile interiors dashboards, side-panels, etc.
A significant development in that evolution of luggage came in , when Rimowa introduced the first suitcase made of polycarbonate. Lighter than aluminum and highly durable, polycarbonate set the stage for the hard-shell cases that are now made by many major players in the luggage industry. Today an amazing number of products are made from polyurethane.
They include bowling balls, surf boards, roller coaster wheels, soccer balls, housing insulation, bandages, denim jeans, running track and roofing tiles. In , polyurethane accounted for about 1. The end use of polyurethane can be segmented as follows:. Log in. Mitchell Residential Mitchell Collection Residential. Product Search. Opening existing Close existing Click to select:. Opening all Polyurethane Fabric Polyurethane PU is a composite material made of: 1 one or more layers of polymer resins joined by urethane links; and 2 a woven or non-woven textile backing such as polyester, cotton, nylon, or ground leather.
Polyurethane Resin Systems All polyurethane coated fabrics are made from polymer resins. Timeline of Polyurethane Applications Dr. Ready To Order? Both polyesters and polyethers can be made to any hardness from marshmallow-soft to bowling ball hard. Products such as skate wheels need to return the energy they absorb when your foot pushes them into the pavement rebound ; otherwise, you would feel like you are running in soft sand.
Sand absorbs most of the energy from your foot and makes you run sluggishly. Polyester is the choice for shock absorption and is used widely in vibration dampening applications.
If the product will come in contact with oils, fuel or solvents even vapors your choice should be a. Go to Navigation Go to Content. Your browser is out of date. The Basics Polyether urethanes typically contain a polyol a reactive compound , a diisocyanate one that reacts very well with the polyol , a catalyst, and a surfactant.
Polyester urethanes are the older of the two types and are still fairly similar chemically. This reaction produces a long chain polymeric foam. Properties and Applications Polyester foams are generally stronger than polyether foams.
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