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What are the common thermosetting plastics?? | MULAN

July 10, 2024

Common thermosetting plastics include phenolic resin, urea-formaldehyde resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, polyurethane and so on.

Phenolic resin (PF)

Phenolic resin is one of the longest plastic varieties in history, also known as bakelite, the appearance of tan or black, is a typical representative of thermosetting plastics. Phenolic resin is mainly used in areas where heat resistance is required, and can also be used as a bonding agent for plywood, grinding wheels and brake pads.

Urea formaldehyde resin (UF)

Urea-formaldehyde resin is a colorless plastic made from urea and formaldehyde. Can be used as molding material, adhesive. The hardness and mechanical strength of urea-formaldehyde resin are excellent. But there are problems with brittleness and water absorption. Urea-formaldehyde resin can be used to manufacture tableware, bottle caps and other daily necessities and mechanical parts, and can also be used as adhesives.

Melamine-formaldehyde Resin (MF)

This plastic makes up for the water intolerances of urea-formaldehyde resins, but is more expensive. Melamine formaldehyde resin and urea formaldehyde resin as colorless transparent, forming color, heat resistance, surface hardness, mechanical properties, electrical properties, water resistance, solvent resistance and chemical resistance is superior, so it can be used in tableware, daily use, furniture, industrial supplies and so on.

Unsaturated Polyester Resin (UF)

Unsaturated polyester resins are transparent liquids of light yellow or amber color with different viscosities. It is usually used with reinforced materials such as glass fiber, called glass steel. Unsaturated polyester resin can be molded without pressure and can be cured at room temperature, so it can be processed into products by various methods.

Epoxy Resin (EP)

Epoxy resins are thermosetting plastics cured with curing agents. It has excellent adhesion, excellent electrical properties and good mechanical properties. Its main use is as metal anti-corrosion coatings and adhesives, often used in printed circuit boards and electronic components of the seal casting.

Silicone Resin (SI)

Silicone resin has excellent heat resistance and cold resistance, and can even withstand 500 ° C after special treatment. It is a thermosetting plastic with excellent chemical resistance, water resistance and weather resistance, and is often used in the production of electronic industry components.


Polyurethanes come in many varieties and are mainly used to make foam. The density of soft foam is 0.015 ~ 0.15g/cm3, mainly used for furniture and packaging materials.


Mulan Group specializes in the manufacture of customized parts. It has been engaged in the customized production of plastic and metal parts for more than 18 years. Mulan Group uses advanced processing equipment and scientific quality management system to provide global suppliers with one-stop customized plastic and metal custom parts production solutions. Mulan Group provides a cost-effective one-stop supply service with an efficient sales team, reasonable low-cost quotation and strong manufacturing resources. Rich production experience allows Mulan Group’s services to meet the products of various industries. Mulan Group has participated in many important product development and manufacturing to understand the use characteristics and requirements of different products. In other words, only a brief description of the customer, the production plan and the actual cost of the product can form a formal report. Mulan Group currently owns 2 manufacturing companies and holds 3 processing plants. Its business scope includes: CNC Machining Service, Sheet metal Fabrication, Rapid Prototyping, Plastic injection molding service, mould tools, etc. An experienced team of engineers and an efficient sales team provide quick feedback to all production project queries for global buyers.

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