Polyethylene Terephthalate (PET)

  • Abbreviation: PET Chips
  • Other Name: PET Resin, Polyester Chips
  • Appearance: White granules
  • Main Grade: Bottle Grade & Textile Grade
  • CAS No.: 25038-59-9
  • HS Code: 390769
  • MF: H(OCH2CH2OCOC6H4CO)nOCH2CH2OH
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Polyethylene terephthalate (PET), also commonly known as polyester chips, PET Chips, PET Resin, is prepared by ester exchange between dimethyl terephthalate and ethylene glycol or by esterification between terephthalic acid and ethylene glycol to synthesize dihydroxyethyl terephthalate, and then polycondensation reaction. And it is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It has excellent physical and mechanical properties in a wide temperature range, and its operating temperature can reach 120°C.

PET resin also has good electrical insulation properties, and its electrical properties are still good even at high temperature and high frequency. As a commonly used resin, PET resin has the characteristics of good creep resistance, fatigue resistance, wear resistance and dimensional stability, low wear and high hardness, and has the greatest toughness, electrical insulation properties among thermoplastics Well, less affected by temperature, but poor corona resistance.

Different Grades of PET Resin

PET chips can be divided into bottle grade PET resin, fiber grade PET resin, and film grade polyester chips according to their uses (mainly due to different process indicators). Please check the details of PET resin granules below:

Bottle grade polyester resin has a uniform crystal structure and narrow molecular weight distribution; non-toxic, odorless, glass-like transparency and luster; good impact toughness and high strength; low gas permeability (that is, good barrier performance), can Extend the shelf life of beverages; simple processing, small dimensional change or small creep under load; compared with glass, it has many characteristics of light weight and good safety.

The end use of bottle grade polyethylene terephthalate resin is primarily determined by intrinsic viscosity (IV). PET chips with IV 0.80 are mainly used in drinking water bottles and mineral water bottles. PET flakes with an IV of 0.85 are mainly used to make carbonated beverage bulk bottles and 3-5 gallon water bottles because these bottles should have good strength and high pressure resistance. PET resin bottle grade has the characteristics of low processing temperature, wide processing range, good transparency and high yield.

Item

Water Bottle Grade

Oil Bottle Grade

Carbonated Bottle

Hot-Filled Bottle

Intrinsic Viscosity, dL/g

0.800±0.015

0.830±0.015

0.875±0.015

0.780±0.015

Acetaldehyde, ppm ≤

1.0

1.0

1.0

1.0

Color

B value ≤

1.0

1.0

1.0

1.0

L value ≥

84

84

80

80

Diglycol, %

1.30±0.2

1.3±0.2

1.3±0.2

1.3±0.2

Terminal Carboxyl, mol/t ≤

35

35

35

35

Density, g/cm3

1.40±0.01

1.40±0.01

1.40±0.01

1.40±0.01

Melting point, ℃

243±2

243±2

243±2

249±2

Moisture, % ≤

0.2

0.2

0.4

0.4

Ash, % ≤

0.08

0.08

0.08

0.08

Fiber-grade PET chips are polymers with an amorphous structure. When the PET resin is heated to a certain temperature, its amorphous structure can be transformed into a crystal structure with a certain degree of crystallinity. The density is 1.33-1.38g/cm3. This product has heat resistance, good light resistance and acid resistance. It is not easy to react when it is in contact with oxidizing agents and reducing agents. However, it has poor alkali resistance, low hygroscopicity and poor electrical conductivity. .

According to the content of matting agent tio2, the textile or fiber grade polyester chips can be divided into: super bright (high gloss), glossy, semi-dull, (full) matte PET chips. In addition, there are cationic polyester chips. Fiber-grade polyester chips are suitable for spinning all kinds of polyester staple fibers and filaments, making various clothing fabrics, cords and woven paper filter nets, etc.

Luster

Intrinsic Viscosity (dl/g)

Color L Value

Color B Value

Melting Point ℃

DEG %

Tio2 Content %

Super Bright(SB)

0.640 ± 0.020

53.0 ± 3.0

1.5 ± 1.5

251.0 ± 2.0

1.45 ± 0.2

——

Semi Dull (SD)

0.640 ± 0.010

75.0 ± 2.0

1.3 ± 1.0

257.0 ± 2.0

1.36 ± 0.10

0.33 ± 0.05

Cationic Dyeable(CD)

0.520 ± 0.020

64.0 ± 3.0

2.8 ± 2.0

242.0 ± 3.0

3.50 ± 0.50

0.10 ± 0.05

Flame Retardant(FR)

0.690 ± 0.020

62.5 ± 4

4.2 ± 3.0

238.5 ± 3.0

3.30 ± 0.70

0.60 ± 0.10

In general, high quality PET resin (silica and titania free) can be used to make PET films. Film grade polyester chips are usually available in super bright and additive (silica) varieties. It is characterized by excellent transparency, and because the gauge of the film is so thin that even the slightest raw material error can have a negative effect on the film quality. Its main applications are printing and lamination, metallization, embossing, holograms, thermal lamination.

Water Bottle Grade
Textile Grade
PET film product

Polyester chips is widely used in many fields, including fibers, bottles, films, etc. In the fiber field, polyester, as the main product of PET fiber, accounts for about half of the world’s synthetic fiber production. In the packaging field, PET bottles and films are the main non-fiber applications of PET, among which packaging is the largest non-fiber application market for polyester and also the fastest growing field for PET. In addition, PET is also used in electronics, medical and health, construction, automobiles and other fields.

  • Heat resistance and impact resistance. The melting temperature of PET resin is around 270℃, and the molding temperature is 270-280℃, which has good heat resistance. At the same time, its impact strength is 3-5 times that of other films, and it has good folding resistance.
  • Flowability. PET resin has good flowability above the melting point, but once it begins to solidify, it immediately becomes difficult to flow.
  • Biodegradable properties. Some polyester chips have biodegradable properties, which helps to reduce environmental pollution.

The production process of PET resin involves raw material preparation, polymerization, extrusion and molding. The main raw materials are terephthalic acid and ethylene glycol, which are formed into PET resin through transesterification and polymerization.

The polymerization reaction is carried out under high temperature and high pressure conditions, and it is necessary to add a catalyst and control the reaction parameters such as temperature, pressure and conversion rate. Finally, after extrusion molding and injection molding, blow molding and other molding processes, a series of PET products of various shapes are made.

Why Choose Fengbai

  • A leading polyethylene terephthalate (PET) supplier in China, fengbai has 15 years of export experience in plastic chemicals industry.
  • We can guarantee sufficient supply and fast delivery.
  • Free samples for testing and various packages to meet customers’ requirements.
  • Fengbai has a good cooperation with many cargo agents and shipping companies.
  • ISO quality, good services and competitive PET resin price.

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