Polypropylene, abbreviated as PP, is a polymer made from propylene through the polymerization reaction. It is a thermoplastic synthetic resin with excellent performance, and is a colorless, semi-transparent thermoplastic lightweight general-purpose plastic.
It is a colorless, semi-transparent thermoplastic lightweight general-purpose plastic. Polypropylene pellets are generally melted and injection-molded, and are widely used in plastic products, packaging, and automotive parts.
The chemical formula of pp is (C3H6)n, the density is 0.89~0.91g/cm3, flammable, melting point is 164~170℃, soften around 155℃, the use of temperature range of -30~140℃. It is resistant to corrosion by acid, alkali, salt liquid and many kinds of organic solvents below 80℃, and can be decomposed under high temperature and oxidation.
2. What is Polypropylene Injection Molding?
PP injection molding is a thermoplastic addition polymer manufactured by combining several propylene monomers. It features an extensive range of applications such as containers of consumer products and molded plastic products for automotive industries who need auto molds. Since its surface is slippery, it can replace plastics like polyacetal (POM) in some low-friction applications.
Though PP is slippery at the molecular level, it has a relatively high friction coefficient and acts as a contact point for furniture. As a result, POM, PTFE, or Nylon are perfect for this purpose.
3. Advantages of Using PP Injection Molding
Polypropyleneis readily available and affordable.
It is resistant to moisture, fatigue, and impact.
PP has a relatively slippery surface which comes in handy many times.
Polypropylene is the perfect electrical insulator.
It is chemically resistant to a wide range of acids and bases.
It possesses a high flexural strength due to its semi-crystalline property.
PP can be formulated into a living hinge that can bend without breaking even under extreme motion (360 degrees).
It can be easily copolymerized with other polymers like polyethylene to make robust engineering applications.
But with advantages come disadvantages as well. Due to the slippery surface of the PP injection mold design, it cannot adhere to the surface of other materials. During times when it is required to form a joint, PP needs welding. This property makes it a substitute for plastics such as Acetal (POM) in low friction applications like gears or as a contact point for furniture.
4. Disadvantages of Using PP Injection Molding
Some of the most common drawbacks of using PP injection molding are
Polypropylene is susceptible to UV degradation.
PP is highly inflammable.
It is susceptible to oxidation.
It is difficult to paint due to its poor bonding properties.
PP has poor resistance to all chlorinated solvents and aromatics.
It has a high thermal expansion coefficient which curbs its high-temperature applications.
5. Common Uses of Polypropylene Plastic (PP)
PP is used extensively in household and industrial applications because of its unique properties and ability to adapt to various fabrication techniques. It can function both as a molded plastic furniture and as fiber. One can manufacture it through different methods for various applications.
It is used in both industrial and household piping because of its high strength.
Due to its resistance to shattering and various chemicals, PP is well-suited for making laboratory applications such as breakers and test tubes.
It is used in making reusable plastic pallets as they have a longer life and high strength.
Compared to other plastics, Polypropylene has a relatively lower density. It results in weight reductions for the producers and sellers of injection-molded products. Because of these reasons, PP can manufacture several applications such as food trays, cups, plates, and toys.
6. About us
Luoyang Dema Import & Export Co., Ltd. aims to provide high-quality, cost-effective products for global factories, plastic product manufacturers, and material distributors. Luoyang Dema Import & Export Co., Ltd. provides thebest PP, PE, PVC, AVE, ABS material solutions for plastic product manufacturers, wholesalers, distributors, distributors, factory owners, processing workshops, etc.
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