Thermosets plastics have gained in popularity among manufacturers, who have switched to their use as a lower cost replacement for metal components. The benefits that thermoset plastics can offer over their metal counterparts include:. The low initial viscosity of materials results in flash and the need for secondary operations.
Also, low tensile strength and ductility tend to result in parts that require designs with thick walls. The compounds used in thermosets are reactive systems, which can impact the useful shelf life. Batch processes may exhibit greater variation and less consistency from lot-to-lot.
High levels of some filler in the materials may result in excessive tool wear. The product quality is. High mechanical property Poor thermal conductivity for housing replacements. Cost-effective The rigidity of the material can result in product failure when used in high in vibration applications.
Composite thermoset materials consist of a matrix and a dispersed, fibrous, or continuous second phase. Casting resins include a catalyst or hardener. Thermoset electrical resins and electronic-grade products are used in potting or encapsulating compounds, conductive adhesives, and dielectric sealants. Thermoset purging compounds are used to clean molding machines between runs of different colors or compositions.
Gap filling products are used to fill in gaps or spaces between two surfaces to be bonded or sealed. Specific types of thermoset materials that are in use within the plastics fabrication industry include the following:.
As discussed earlier, plastics are widely recognized as real- world applications of the use of chemistry. From plastic containers, bottles, and life-saving medical devices to aerospace components, plastics are a material that is used in applications all around us. Thermoplastic polymers are one such type of plastic which is known for its versatility and recyclability. Thermoplastic polymers form when repeating units called monomers link into chains or branches.
Thermoplastic pellets soften when heated and become more fluid as more heat is administered. There are a variety of thermoplastic resins that offer various performance benefits, but the majority of materials commonly used offer high strength, shrink- resistance, and easy flexibility. Depending on the resin, thermoplastics can serve low-stress applications such as plastic bags or can be used in high-stress mechanical parts.
Examples of thermoplastic polymers include polyethylene, PVC, and nylon. In polluted, acidic, environments such as may be found in modern cities, steel piping systems are often vulnerable to rust or corrosion and therefore need special provisions for corrosion protection. The cost associated with protecting steel piping systems that are exposed to these harsh environments can be expensive. Thermoplastics are considered to be a favorable substitute to minimize these costs.
Certain properties of thermoplastics that make them a suitable substitute material are:. Polyethylene gas tanks are used to transport natural gas for use in residential and commercial applications. Other common applications for thermoplastics include high- pressure polyethylene to encapsulate rigid objects like electrical equipment.
Low-pressure polyethylene is very elastic and ideal for insulating electrical cables. Polyamide is most commonly associated with the production of ropes and belts. The primary advantage of thermoplastics is their wide range of applications. Thermoplastics are high strength, lightweight materials and have relatively low processing costs.
Additionally, thermoplastic components are relatively easy to manufacture with high volume and precision. The primary disadvantage of using thermoplastics instead of materials such as metal is their relatively low melting point.
Certain types of low-quality thermoplastics can melt when. Furthermore, thermoplastics can have poor resistance to organic solvents, hydrocarbons, and highly polar solvents.
Thermoplastics are susceptible to creep, which occurs when the material stretches and weakens under exposure to long- term stress loads. The susceptibility to creep is further exacerbated by the lower melting temperature of the material. Other types of thermoplastics, such as composites, can fracture instead of becoming deformed under high- stress conditions.
May soften when reheated Can be remolded and reshaped. Can be more expensive than thermoset Chip resistance. Types of thermoplastics commonly employed for manufacturing include polyethylene PE , polyvinyl chloride PVC and polystyrene PS , which often is used for packaging. Other groups of thermoplastics are acrylics, fluoropolymers, polyesters, polyimides, and nylons.
All of these types can be melted down repeatedly and re-shaped into different forms. For example, a foam cup is a thermoplastic material man be re-melted and fabricated into a dish. Thermoplastics and thermosetting plastics are both polymers but behave differently when exposed to heat. The key difference between thermoplastic and thermosetting plastics involves the fact that thermoplastics can melt under heat after curing, while thermoset plastics keep their form and remain solid under heat once cured.
The low melting point of materials made from thermoplastics makes it ideal for applications that use recycled material, while products made from thermoset plastics can withstand high temperatures without losing their shape, so are inherently considered more durable. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks.
Bestsellers Editors' Picks All Ebooks. Explore Audiobooks. Bestsellers Editors' Picks All audiobooks. Explore Magazines. Editors' Picks All magazines. Explore Podcasts All podcasts. Difficulty Beginner Intermediate Advanced. Explore Documents. Thermoplastics and Thermosetting Plastic. Document Information click to expand document information Description: :.
Did you find this document useful? Is this content inappropriate? Report this Document. Description: :. Flag for inappropriate content.
Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Hard and rigid Much more difficult to surface finish. Excellent aesthetics finishes Cannot be remolded or reshaped. Varun Vijay. Nikita Sedush. Bart Kemper, P. Samet Belli. Caio Paim. Shadowiw Kulit. Kamasani Praveena.
Amany Khaled. Yoni Benshahar. Saead Houshmand. Flag for inappropriate content. Download now. For Later. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. It hardened by can be melted cold one time temperature Bring me back.
Estevan Benedett. Mushfiq Sarfaraz Yasin. Pipeline Engineer. Niaz Ali Khan. Pramod Wattegedara. Omendra Singh. Samantha Lim Ai Pei. Sharath Kumar KR. Matheus M. Dos Reis. Sahil Chaudhary. Purushothama Nanje Gowda. Selcuk Denizhan. Maite Isabel Esteiro. Pearl Prakash.
Shweta Yadav. More From momon. Amrizal D's Patri. Popular in Building Engineering. David C Talledo. Ali Alexandra. Quitzs Quitzs. Guille LR. Shameer Majeed. Ary Tubagus. Gema Putra Pratama. Kamal Deshapriya. Sajida Rakhmah. Fiber Partner. Niroshan Perera.
0コメント