Thermoset Plastics Materials and Resins

According to what we saw earlier to make a first brief introduction to the classification of plastic materials were to organize them into three groups. Then we will see two of the above groups : Materials Thermoset Plastics and Resins.

First Group: Thermoset Materials. The molding of these types of plastics is by means of a mold steel, breaking pressure and heat. The feature is that once molded and can not re-softened by heat. If the piece is too heated, the result is a charred product. An example of these plastic materials have a bakelite , melamine, among many others. Second Group: Plastic Resins. These materials have a presentation that comprise two or more components are usually liquids. Here, when mixed, cause a chemical reaction that results in a solid material. Take into account that the final product can not be softened by applying heat. The main difference is that thermosets steel molds need not , since no pressure is required, moreover, in certain circumstances, depending on the type of resin, the heat may not be required. That is, the chemical reaction can be conducted at ambient temperature and in open molds. These materials are worked by the casting technique, which is discussed later, when study one of the many methods of constructing mold cavities. Examples of plastic resins:

• Polyester resins, that are generally used in motorsport and nautical equipment, used for the construction and manufacture of helmets and auto body parts through the impregnation of glass fiber, ornamental parts cast in silicone rubber molds.
• Epoxy Resins: On the market are more expensive . Its applications have the same characteristics as polyester. However, the advantage is that these do not shrink or warp in any way to harden. Because of this and because it is less fragile are ideal for the manufacture of dies and molds.