PET and PETE are both short for polyethylene terephthalate. Or PET-P for short. APET and PETG are PETde copolymers, also known as Amorphous Polyethylene Terephthalate, which are heat-shrinkable polyester films. General Polyester is generally made from terephthalic acid (PTA ) and ethylene glycol (EG) through Esterification, polycondensation reaction, belongs to Crystalline Polymer (strictly speaking, is the coexistence of crystalline and Amorphous Polymer) . It is generally milky white or light yellow, highly crystalline polymer, smooth and shiny surface, products even at lower temperatures processing, do not add fillers can also remain transparent. Excellent physical and mechanical properties can be maintained over a wide range of temperatures, up to 120 degrees for long-term use. Good electrical insulation. Resistance to creep, friction and fatigue. Good dimensional stability. But because of its high glass transition temperature, low crystallization rate, processing molding difficult, high molding temperature, long production cycle, poor impact resistance. Therefore, it is necessary to improve the processing performance by means of reinforcement, filling and blending. The uses of PET can be divided into fibers (70% of the early use of synthetic fibers) and non-fibers. The latter include well-known packaging materials (food and beverage containers, vacuum packaging, etc.) , insulation, tape bases, film and photographic film, etc. .
The so-called copolymerization modification is to introduce a third or even a fourth component in addition to the terephthalic acid (PTA ) and ethylene glycol (EG) , the aim is to form an amorphous PET copolymer with asymmetric molecular structure. If modified by dicarboxylic acid (Acidic) , the PET copolymer is called APET. Compared with PET, APET’s low temperature toughness (impact resistance and tear resistance) and heat resistance are improved. Products on the appearance of a higher transparency; if the GLYCOLIC copolymerization of modified, made by PET COPOLYMER, called PETG. The hardness, stiffness and toughness of PETG are better than those of PET homopolymer. Products are more transparent and can even be colorless. In practical processing, PET is provided in the form of grains, while APET and PETG can be provided in the form of Amorphous materials.
The 1,2,3,4,5,6,7 of the environmental protection marks correspond to different polymers, namely: 1 Represents Pet; 2 represents HDPE, high density polyethylene; 3 represents PVC, polyvinyl chloride; 4 represents LDPE, low density polyethylene; 5 represents PP, polypropylene; 6 represents PS, Polystyrene; Seven stands for other polymers.