A buildup of charges due to dry skin rubbing on clothes. There are two type of acrylic extruded which is cheaper and very plastic and cast which machines better but is harder and less flexible. Thats why youre able to reheat your leftovers in tupperware without worrying about it melting. Engineering plastics are a group of plastic materials that have better mechanical andor thermal properties than the more widely used commodity plastics such as polystyrene, pvc, polypropylene and polyethylene being more expensive, engineering plastics are produced in lower quantities and tend to be used for smaller objects or lowvolume applications such as mechanical parts, rather than. S flexible packaging market by material plastic film. See a full breakdown of each kind of plastic, along with its.
Plastic material is a term that refers to a large class of polymers, separated into various groups and subgroups. Both types of plastic materials are recyclable and it is possible to produce biodegradable plastics with both types of feedstocks. Pvc type 1 typical properties property units value 1 astm method physical properties density gcm3 1. An overview of the plastic material selection process for. Thermoplastic elastomers tpe, sometimes referred to as thermoplastic rubbers, are a class of copolymers or a physical mix of polymers usually a plastic and a rubber that consist of materials with both thermoplastic and elastomeric properties. For chemically resistant plastic, view our chemical resistance of plastics chart. Therefore, to determine the exact density of plastic, it is. The two principle types extruded and cast have similar properties, but extruded sheet can be vacuum formed whereas cast sheet can be pressed. Plastics are essential materials of modern day life. Although the information and statements herein are believed to be accurate, no guarantee of their accuracy is made. While most elastomers are thermosets, thermoplastics are in contrast relatively easy to use in manufacturing, for example, by injection molding. The most common takeout packaging usually made in black or very rigid, crackresistant,leak preferred material moderately priced. Each type of filler lends a unique property set to the host polymer.
Characterization of plastics in failure analysis jeffrey a. It is calculated by dividing the mass of the material by the volume and is normally expressed in gcm 3. The main characteristics or the properties which determine a plastics processability are molecular weight, uniformity, additive type, content and plastic feed rates. Greene, csu 7 medical plastics and composites use containers bottles, bags drug delivery iv bags, syringes tubing and tools for surgery implants, artificial skins the use of plastic materials in the medical field, about. Polystyrene is commonly recycled, but is difficult to do. Types ofmaterial used in food packaging material use appearance i properties temperature cost toler. This property of plasticity, often found in combination with other special properties such as low density, low electrical conductivity, transparency, and toughness, allows plastics to be made into a great variety of products.
To initially determine whether a material is thermoset or thermoplastic, heat a stirring rod to about 5000f2600c, the material is a thermoplastic. Before starting the chapter on the uses and subsequent recycling of plastic, let us establish a general classification of these thermosetting resins or thermoplastics the two big groups into which we include elastomers by detailing their properties, their makeup, their. The plastic properties on pages 222223 are exclusively applicable for the specified standard test pieces. Polymethylmethacrylate pmma plastic sheet it is a versatile material. An overview of the plastic material selection process for medical devices. Code 7 is used to designate miscellaneous types of. Acrylics are available in a range of colours and can be opaque, translucent or transparent. Smart plastics guide plastic products are typically labeled with a number surrounded by the recycling symbol. Such a material iselastic accordingtothedescription ofelasticity given earlier immediate response,fullrecovery, andit is also linear in its relation between stress and strain or equivalently, force and deformation. Plastic, polymeric material that has the capability of being molded or shaped. These two definitions of true strain are equivalent in the plastic range where the material volume can be considered constant during deformation as shown below.
Any particular plastics performance across these criteria can vary widely. Caused by the macromolecular structure and the temperature dependent physical properties plastic materials are distinguished into different. Plastic marked with an spi code of 6 is made with polystyrene. Both types of plastic materials are recyclable and it is possible to produce bio degradable plastics with both types of feedstocks.
Injection molding is the process of making custom plastic parts by injecting molten plastic material at high pressure into a metal mold. Use our interactive properties table below to explore by property group, sort, or compare two or more plastic materials. Variations may occur as far as cases and technical parts are concerned. Also, you may want to use our plastic material selection guide or interactive thermoplastics triangle to assist with the material selection process based on your application requirements. Manufacturers utilize a variety of different plastic materials and compounds that each possess unique properties. Thermoplastic polymers are represented by a large range of plastic materials. Usually a chemical reaction involves a transformation of the sample into a different. Since the previous edition, several new materials have been. This information will help you sort plastic materials more effectively for recycling. The seventh edition of this classic reference work once more provides a comprehensive overview of commercially available plastics materials. Many complex plastic compounds require a rigorous spectral or destructive chemical analysis for a positive identification. The society of the plastics industry spi established a classification system in 1988 to allow consumers and recyclers to identify different types of plastic. This manual is designed to help you the design engineer, product. What is a major cause of getting static electricity shocks.
Items such as disposable coffee cups, plastic food boxes, plastic cutlery and packing foam are made from ps. If you wear a cap and are having problems with static cling, what type of material would be your. Within manufacturing technology there is a very high degree. Typical reactions for chain assembling are polyaddition continuous or step wise and condensation polymerization polycondensation 1 figure 1. It is extremely important to pick the right material for the right product application, taking into consideration usage, environment conditions, type of abrasion, and even overall user experience.
This quiz is comprised of multiplechoice questions designed to test your level of understanding of the material covered in the continuing education article, frame materials. A plastic with good processability possesses the properties necessary to make it easy to process the plastics into desired shapes. It is available in the form of liquid at room temperature. The density of a plastic sample may change due to change in crystallinity, loss of plasticizers, absorption of solvent, etc. Associated with the different types of resin are potential health risks. Caused by the macromolecular structure and the temperaturedependent physical properties plastic materials are distinguished into different. Plastic material properties table mechanical, physical. S flexible packaging market by material plastic film, aluminium foil, paper, bioplastic, type standup pouches, retort pouches, gusseted bags, others. This type of plastic is strong and can usually withstand higher temperatures. This paper presents an overview of the plastic material selection process, with specific emphasis on the unique requirements of. Material type acronym pet hdpe lope eps other plastic identification code full polymer names po,hyetnylene terepntnalate high density polyethylene potpinyl chloride unplasticised. Fillers are an extremely diverse group of materials. A resin is judged by any number of criteria strength, toughness, aesthetics, etc.
A material that can burn is described as flammable. The properties of thermosetting plastic material are as follows. It is important to note that density varies with temperature. A simple guide to plastic molding processes, best uses. The plastic and packaging material used by okw are on the whole harmless and, apart from some exceptions, can easily be recycled and reutilized. The investigation is performed in generally the same manner, whether the failed component was.
Frame materials you must be an aoa associate member and answer seven of ten questions successfully to receive one hour of continuing education credit. These numbers and labels identify both the type of resin used to make the plastic and the products recyclability. The ultimate objective of a failure analysis is to ascertain the mode and the cause of the failure, regardless of the material from which the part was fabricated. Some of them are reusable, the others produce hazardous material after several uses. Bridging the gap between theory and practice, it enables scientists to understand the commercial implications of their work as well as providing technologists with a theoretical background. Just like other forms of plastic molding, after the molten plastic is injected into the mold, the mold is cooled and opened to reveal a solid plastic part. An overview of the plastic material selection process for medical devices february 20 the d. Pvc type 1 typical properties plastic sheets, plastic.