Properties of PVC

Polyvinylchloride (Polyvinylchloride, PVC) PVC material invented quite early, and many applications in industrial products, because PVC also has the advantages of other plastic materials, and in the processing, plasticity is quite excellent; coupled with the price is cheap, the use of common, used in such as pipes, profiles, building materials, wire and cable sheath, etc. In addition, PVC film heat shrinkage is good, widely used in boxes and bottles outside the label. In addition, PVC film heat shrinkage is good, widely used in boxes and bottles outside the labeling, PVC has a certain degree of flame retardancy, remove the source of ignition that is self-extinguishing, burning smell has an acidic odor.

PVC has high specific gravity, flame resistance, high transparency, good insulation and good printability. Different formulations have different characteristics, widely used, inexpensive. When the processing temperature exceeds 190℃, it is easy to be cracked and release HCl gas. The molecular weight is between 60,000~150,000, it has good resistance to electricity and fire.

Characteristics of PE polyethylene

Polyethylene (polyethylene, PE) is the most widely used plastics in industry and life, generally often divided into high-density polyethylene (HDPE) and low-density polyethylene (LDPE) two kinds of HDPE than LDPE melting point, hardness, and more resistant to corrosive liquids, PE is very good for acidic and alkaline resistance, the plastic bags and a variety of translucent or opaque plastic bottles are almost all made of PE, such as detergents, shampoos, body lotions, edible oils, pesticides, etc. Most of them are filled with HDPE bottles. Translucent or opaque plastic bottles are almost all made of PE, such as detergents, shampoos, body lotions, edible oils, pesticides, etc., most of the HDPE bottles to contain. Identification: mostly opaque, feel like wax, plastic bags rubbed or rubbed with a rustling sound.

High-density polyethylene using low-pressure gas-phase type or liquid-phase type, through the medium-pressure method and low-pressure method can be produced high-density polyethylene (HDPE) (density of 0.950 ~ 0.965), HDPE is a hard thermoplastic. HDPE is a rigid thermoplastic. In terms of hollow molded products, HDPE is mostly preferred for manufacturing, and only a few are made of LDPE. As for the application of HDPE materials in the pipe, and PVC pipe and metal pipe to compete for the market.

Low-density polyethylene to high temperature and high pressure method, low-density polyethylene (LDPE) (density of 0.915 ~ 0.930), LDPE is a semi-rigid thermoplastic.LDPE film in the application of the frequent challenge of PVC and PP materials, especially in the shrink and stretch packaging, with substitutability.

LDPE is ubiquitous in modern life, but not because of the containers it’s made into, but because of the─plastic bags you see everywhere. Most plastic bags and films are made of LDPE, and containers made of LDPE without coloring are mostly translucent, such as milk bottles and flexible film boxes.

PP polypropylene characteristics

Polypropylene (polypropylene, PP) is a polymerization of propylene, and polyethylene similar to have greater mechanical strength and higher melting point (about 165 ℃), the polyethylene in a hydrogen atom replaced by methyl (methyl, CH3).

Advantages . 

• Lightweight, chemical resistant, heat resistant

Disadvantages . 

• Poor impact resistance at low temperatures

• Difficult to be painted or adhered to by adhesives

• Molded surfaces reinforced with glass fibers are not smooth

Polypropylene offers a balance of properties and price that most thermoplastics cannot. Polypropylene is easy to mold and has excellent chemical and mechanical resistance.

Polypropylene is used in the automotive industry, household appliances, plastic rope, carpeting, shoe heels, as well as in kitchen and bathroom fixtures, tubing; transparent film for packaging and wrapping paper for fresh food. Its low flammability and breathability make it highly suitable for sportswear, and some high-quality horns are made from polypropylene, especially automobile horns; its high strength makes it suitable for use in the manufacture of automobile bumpers.

PP is more rigid and heat-resistant than PE, often used in food packaging, with a pinch there will be a crunch crunch crunch crunch sound, in the disposable lunch boxes, milk tea cups a large number of applications.