Phenolic resin is one of the oldest varieties of plastic, commonly known as bakelite or Bakelite, the appearance of brown or black, is a typical representative of thermosetting plastics. Phenol resin molding often use various types of fillers, are different depending on the finished properties of the filling material, phenolic resin as a molding material, mainly used in areas requiring heat resistance, but also as an adhesive for plywood, wheel and brake pads.
Urea-formaldehyde resin is used as a molding material, adhesive colorless plastic produced from urea and formaldehyde. Urea-formaldehyde resin molding material is added cellulose. And the hardness, excellent mechanical strength. On the other hand, there are brittle, have the disadvantage of poor water absorption, dimensional stability, even standing often cracks. Urea-formaldehyde resin can be produced tableware, caps, and other daily necessities and mechanical parts, the adhesive can be done.
Melamine - formaldehyde resin（MF）
Melamine - also known as melamine formaldehyde resin, melamine dense, melamine. The plastic makes up for shortcomings of urea-formaldehyde resin is not water-resistant, but the price is higher than the urea-formaldehyde resin. Because melamine - formaldehyde resins and urea-formaldehyde resin as a colorless and transparent, forming colorful, but also due to the heat resistance, surface hardness, mechanical properties, good electrical properties, water resistance, solvent resistance and excellent chemical resistance, so it can be tableware, all kinds of daily necessities (including furniture), industrial supplies area.
Unsaturated Polyester Resin（UF）
Unsaturated polyester resin is a transparent yellow or amber liquid with different viscosities. Because unsaturated polyester resin strength is not high, it is often added to glass fiber reinforced materials, products, commonly known as fiberglass. Before curing of unsaturated polyester resins in liquid form, but it can also be molded without pressurization, curable even at normal temperature, which can be used various processing methods into products.
Epoxy resins are cured with a curing agent of thermosetting plastics. Its excellent adhesion, excellent electrical properties, but also excellent mechanical properties. The main purpose is to make the epoxy resin anticorrosive metal coatings and adhesives, commonly used in printed circuit boards and electronic components encapsulated.
And each of the aforementioned resin is different from the main component other than carbon, but silicon, so the price is high. But silicone resin Heat 180 ℃, special treatment can be resistant to 500 ℃, good cold resistance, physical properties do not change with temperature. Is a chemical resistance, water resistance, and excellent weatherability thermosetting plastics, it is heat-resistant material products electronic components industrial production.
Many varieties of polyurethane, can be made from lightweight thermoplastic elastomers to rigid foams. Soft polyurethane foam has a density of 0.015 ~ 0.15g / cm3, soft foam molded into a massive, easy to cut to make furniture and packaging materials. Easy to cut to make furniture and packaging materials. Rigid foam can be made of various types.