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Industry Glossary
Welcome to our glossary. The information is presented as a short overview. If you have additional information which should be included here, we ask you to send us an email. Polyurea Polyurea are formed by chemical reaction between isocyanate (usually MDI) and amine-terminated resins. The resins do not contain catalysts, and they are normally comprised of polyetheramines plus other ingredients or aspartic esters. As per the official definition by the PDA, it is critical to use amine-terminated resins or else the final result does not qualify as polyurea. Polyurea are mostly used as industrial coatings. They are quite resistant against a wide variety of materials (including hydrocarbons and hydrogen sulfide gas, many acids, and other aggressive substances). Likewise, polyurea may be used in flooring, waterproofing, and other protective applications. Polyurea are spray applied at pressures between 1800 and 3000 psi and temperatures as high as 175 oF. Obviously, the individual application parameters depend strictly on the properties of each individual material. Polyurea can be applied during a wide range of environmental conditions (including very cold ambient temperatures). You may contact CPI for further details and sourcing of a wide variety of materials and appropriate equipment.The PDA has published a definition which the reader may want to consult for further details. Polyurethane Polyurethane is formed by chemical reaction between isocyanate and a resin blend containing only hydroxyl-containing resins. Normally, polyurethane contains one or more catalysts. Other ingredients might be surfactants, fire retardants, blowing agents (foam only, not coatings), pigments, fillers and additives. Typically, urethane offers excellent adhesion and abrasion resistance and relatively low cost. Due to the hydroxyl contents, polyurethane requires low humidity and very dry substrates during application. Most polyurethane systems are 1:1 ratio systems; however, there are exceptions as well. Polyurea/Polyurethane Hybrids There are many hybrid products available containing both hydroxyl-terminated and amine-terminated resins. Obviously, these materials are made to combine properties and cost advantages. As an example, polyurethane offers extreme adhesion while polyurea offers extreme impact resistance. When used as a bedliner, a hybrid system may make the most sense. Aromatic vs. Aliphatic Systems Aromatic systems are usually less expensive but not as UV-resistant as aliphatic systems. As of today, most quality aliphatic systems are quite UV resistant and color fast. Typically, the term "aliphatic" is used in reference to open-chain (non-cyclic) hydrocarbons although these may be branches as well. An aromatic molecule or compound is one that has special stability and properties due to a closed loop of electrons. Not all molecules with ring (loop) structures are aromatic. HCFC Blowing Systems (141b vs. 245a) |
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