Polyethylene terephthalate
IUPAC: poly(ethylene terephthalate)
| Formula / Notation | (C10H8O4)n |
|---|---|
| CAS Number | 25038-59-9 |
| Molecular Weight | Variable (polymer) |
| Melting Point | 255–265 °C |
| Boiling Point | Decomposes |
| Density | 1.38–1.41 g/cm³ |
| Solubility | Insoluble in water |
| Appearance | clear to white solid |
| Also Known As | PET; PETE; polyester; Dacron; Mylar; Terylene |
| Category | Polymers & Plastics |
What is Polyethylene terephthalate?
Polyethylene terephthalate (PET) is a thermoplastic polyester resin produced by polycondensation of ethylene glycol and terephthalic acid. It is one of the most widely recycled plastics (resin code 1). PET exists as an amorphous, transparent form and as a semi-crystalline form. It has excellent barrier properties against gases and moisture, high tensile strength, and good chemical resistance, making it ideal for food and beverage packaging.
Formula & Notation
IUPAC Name: poly(ethylene terephthalate)
Other Names / Synonyms: PET; PETE; polyester; Dacron; Mylar; Terylene
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 255–265 °C |
| Boiling Point | Decomposes |
| Density | 1.38–1.41 g/cm³ |
| Molecular Weight | Variable (polymer) |
| Solubility | Insoluble in water |
| Appearance | clear to white solid |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Polyethylene terephthalate (PET) is a thermoplastic polyester resin produced by polycondensation of ethylene glycol and terephthalic acid. It is one of the most widely recycled plastics (resin code 1). PET exists as an amorphous, transparent form and as a semi-crystalline form. It has excellent barrier properties against gases and moisture, high tensile strength, and good chemical resistance, making it ideal for food and beverage packaging.
Plastic bottles for beverages and food. Polyester fibres (clothing, textiles). Packaging films (Mylar). Engineering components. Medical packaging. Carpet fibres.
Generally regarded as safe for food contact (FDA approved). Releases acetaldehyde at high processing temperatures. Not biodegradable but widely recyclable. Antimony (catalyst residue) may leach at high temperatures. Consult SDS before industrial processing.
The formula or notation for Polyethylene terephthalate is: (C10H8O4)n