High Quality Polyethylene Terephthalate (PET) with CAS number 25038 - 59 - 9 is a thermoplastic polymer resin of the polyester family. It is known for its high strength, transparency, and excellent chemical resistance.
Physical properties: It has a high melting point typically around 250 - 260°C, good tensile strength, and low gas permeability. The density of PET is approximately 1.38 g/cm³.
Chemical properties: It is resistant to many chemicals including diluted acids and alkalis. However, it can be attacked by concentrated sulfuric acid and some organic solvents at high temperatures.
Packaging Industry: PET is widely used in the packaging industry due to its excellent barrier properties against oxygen, carbon dioxide, and moisture. It is commonly used to make beverage bottles, food containers, and packaging films. The transparency of PET allows consumers to see the product inside, enhancing the visual appeal of the package.
Fiber Industry: PET fibers are used in the textile industry to make clothing, carpets, and upholstery. They are known for their durability, wrinkle - resistance, and easy maintenance. In addition, PET fibers are also used in industrial applications such as tire cords and conveyor belts.
Engineering Plastics: PET can be used as an engineering plastic in applications where high strength and dimensional stability are required. It is used in the production of automotive parts, electrical components, and consumer goods.
Processing: PET can be processed using a variety of methods including injection molding, extrusion, and blow molding. Injection molding is commonly used to produce small, complex parts such as bottle caps and electronic components. Extrusion is used to produce films, sheets, and fibers. Blow molding is used to produce hollow objects such as bottles and containers.
Pre - drying: Before processing, PET needs to be pre - dried to remove moisture. Moisture can cause hydrolysis of the polymer during processing, leading to a decrease in molecular weight and mechanical properties. The recommended pre - drying temperature is around 150°C for 4 - 6 hours.
Processing Conditions: The processing temperature for PET typically ranges from 260 - 290°C. The mold temperature should be maintained between 20 - 80°C depending on the part geometry and requirements.
Case 1: Beverage Bottles
In the beverage industry, PET bottles have become the standard packaging for carbonated soft drinks, water, and juices. A major beverage company switched from glass bottles to PET bottles for its new product line. The use of PET bottles reduced the weight of the packaging by up to 50%, resulting in significant savings in transportation costs. The excellent barrier properties of PET also ensured the freshness and carbonation of the beverages for a longer period. In addition, the transparency of PET bottles allowed consumers to see the product inside, which increased the marketability of the beverages.
Case 2: Textile Applications
A well - known textile manufacturer used PET fibers to produce a new line of sportswear. The PET fibers provided excellent moisture - wicking properties, keeping the athletes dry during intense workouts. The wrinkle - resistance of PET fibers also reduced the need for ironing, making the sportswear more convenient for consumers. The durability of PET fibers ensured that the sportswear could withstand repeated washing and wear, which increased the customer satisfaction.
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