Polyurethane is an organic polymer.
Polyurethanes or Urethanes are terms that are used interchangeably for a family of elastomers that were invented as ‘artificial rubbers’ during World War II. Polyurethane elastomers are a unique breed of Engineering materials that combine the advantages of rigid plastics, metals and ceramics with the flexibility and elasticity of rubber.
Polyurethanes are available as Thermosets or Thermoplastics:
- Thermosets are a blend of a resin and a curative, that yield some high performance Engineering properties that are not obtained by any other process. Molding process is similar to Epoxies, bakelite, etc., wherein a Resin and a curative are blended to form a chemical cross linking, and once this reaction takes place, the mix has to be poured into a mold cavity before it cures. Once it is cured it cannot be re-melted or re-ground and re-used. Main advantages of this molding process is the ability to mold large or complex shaped parts with fairly in-expensive molds, and the ability to obtain a variety of physical properties and combination of properties that can be optimized for a given application. These are commonly known as Cast Polyurethanes.
- Thermoplastic polyurethanes are available in pellet shapes, similar to other plastic materials and can be re-melted and molded by injection molding or extrusion. The size of the molded part or the cross section of the extrusion is limited.
Apa itu Polyurethane?
Polyurethane adalah polimer organik
Polyurethanes atau Urethanes adalah istilah yang dipakai bersama sama untuk menyebut suatu kelompok elastomer yang diciptakan sebagai “karet non alami” di jaman Perang Dunia ke II. Elastomer Polyurethane merupakan produk hasil pengembangan teknologi yang unik. Sebagai material industri, polyurethane mengkombinasikan kekuatan plastik, metal dan keramik dengan fleksibilitas dan elastisitas karet.
Polyurethane tersedia sebagai Thermoset atau Thermoplastic.
