Is PET and PE the Same

Is PET and PE the Same?

PET polyethylene terephthalate.

PE is polyethylene.

PE: polyethylene
It is one of the most commonly used polymer materials in daily life, and is widely used in the manufacture of plastic bags, plastic films, and milk buckets.
Polyethylene is resistant to various organic solvents and corrosion of various acids and bases, but not to oxidative acids such as nitric acid. Polyethylene will oxidize in an oxidizing environment.
Polyethylene can be considered transparent in the film state, but when it exists in bulk, it will be opaque due to strong light scattering due to the existence of a large number of crystals in it. The degree of polyethylene crystallization is affected by the number of branches, and the more branches, the more difficult it is to crystallize. The crystal melting temperature of polyethylene is also affected by the number of branches, ranging from 90 degrees Celsius to 130 degrees Celsius. The more branches, the lower the melting temperature. Polyethylene single crystals can usually be prepared by dissolving HDPE in xylene at temperatures above 130 degrees Celsius.

PET: polyethylene terephthalate
A polymer of terephthalic acid and ethylene glycol. The English abbreviation is PET, which is mainly used in the manufacture of polyethylene terephthalate fiber. The Chinese trade name is polyester. This kind of fiber has high strength and good wearing performance of its fabric. It is currently the most productive variety of synthetic fibers. In 1980, the world output was about 5.1 million tons, accounting for 49% of the world’s total synthetic fiber output.
The high degree of symmetry of the molecular structure and the rigidity of the p-phenylene chain make the polymer have the characteristics of high crystallinity, high melting temperature and insoluble in general organic solvents. The melting temperature is 257-265 °C; its density increases with The degree of crystallinity increases, the density of the amorphous state is 1.33 g/cm^3, and the density of the fiber is 1.38-1.41 g/cm^3 due to the increased crystallinity after stretching. From the X-ray study, it is calculated that the complete The density of the crystals is 1.463 g/cm^3. The glass transition temperature of the amorphous polymer was 67°C; the crystalline polymer was 81°C. The heat of fusion of the polymer is 113-122 J/g, the specific heat capacity is 1.1-1.4 J/g. Kelvin, the dielectric constant is 3.0-3.8, and the specific resistance is 10^11 10^14 ohm.cm. PET is insoluble in common solvents, only soluble in some highly corrosive organic solvents such as mixed solvents of phenol, o-chlorophenol, m-cresol, and trifluoroacetic acid. PET fibers are stable to weak acids and bases.
Application It is mainly used as raw material for synthetic fibers. Short fibers can be blended with cotton, wool, and hemp to make clothing textiles or interior decoration fabrics; filaments can be used as clothing yarns or industrial yarns, such as filter cloths, tire cords, parachutes, conveyor belts, safety belt etc. The film can be used as a base for photosensitive film and audio tape. Injection molded parts can be used as packaging containers.

Our packaging machines can fill PE and PET bottles