EN
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PET
Material Type
Engineering Plastics
Material Full Name
Polyether Ether Ketone
Process Compatibility
Injection Molding, CNC Machining
Basic Properties
Property |
Parameter/Performance |
Remarks |
|---|---|---|
| Chemical Name | Polyethylene Terephthalate | Aromatic ester backbone (-Ph-COO-) |
| Molecular Structure | Semi-crystalline thermoplastic (30-50% crystallinity) | Classified into fiber, bottle, film, and engineering grades |
| Density | 1.33~1.38 g/cm³ | Unfilled: 1.35 / 30% GF: 1.56 |
| Transparency | Highly transparent (>90% for films) | Optical grades available (no crystallites) |
| Mechanical Properties | ||
| – Tensile Strength | 55-75 MPa (unfilled)/150-180 MPa (GF) | High rigidity but less tough than PBT |
| – Elongation at Break | 50-150% (unfilled)/2-4% (GF) | Film grades exceed 300% |
| – Wear Resistance | μ=0.4-0.5 | Requires lubricant additives |
| Thermal Properties | ||
| – HDT (1.82MPa) | 70-85℃ (unfilled)/220-240℃ (GF) | Heat-resistant grades (mineral-filled) reach 250℃ |
| – Service Temperature | -40℃~120℃ (GF short-term 150℃) | UL RTI 120℃ (electrical) |
| Chemical Properties | ||
| – Hydrolysis Resistance | Inferior to PBT (long-term resistance to 60℃ hot water) | GF grades degrade in boiling water |
| – Chemical Resistance | Resists oils/greases/weak acids | Vulnerable to strong alkalis/concentrated sulfuric acid |
Processing Characteristics
Drying Essential:
-
-
140-160℃ for 4-6 hours (moisture <0.005%)
-
Hydrolytic degradation risk if moist (IV drops)
-
Melt Temperature:
- 260-290℃ (degrades >310℃)
Mold Temperature:
- 80-140℃ (higher temps enhance crystallinity)
Special Processes:
- Injection stretch blow molding (preform-to-bottle)
- Biaxial stretching (film production)
Common Application Areas
- Packaging: Water bottles, food trays
- Electronics: Capacitor films, motor insulation sheets
- Textiles: Polyester fibers, industrial ropes
- Automotive: Engine components, light covers
PET Modified Types
Type |
Characteristics |
Typical Applications |
|---|---|---|
| Fiber-Grade PET | High tensile strength, low crystallinity | Textile fibers, industrial yarns |
| Bottle-Grade PET | High clarity, low acetaldehyde | Beverage bottles, edible oil containers |
| Film-Grade PET | Biaxially oriented (BOPET), ultra-high strength | Packaging films, insulation films |
| Engineering PET | GF/mineral reinforced, heat-resistant | Electronic connectors, automotive parts |
| Flame-Retardant PET | UL94 V0 (Br/P-based) | Power sockets, switch components |
Advantages & Disadvantages
Advantages |
Disadvantages |
|---|---|
| Ultra-high strength/rigidity (GF-reinforced) | Low heat resistance (unfilled) |
| Excellent gas barrier (packaging) | Notch sensitive (requires radii) |
| 100% recyclable (♷1 code) | Requires rigorous drying |
Other Engineering Plastics Selection
POM Materials
PA Materials
PC Materials
PPO Materials
PEEK Materials
FAQ Of PET Materials
Visit our FAQ center for more questions.
What are the most prominent characteristics of PET plastic?
PET offers outstanding clarity, high mechanical strength, excellent gas barrier properties and recyclability, making it ideal for beverage bottles and food packaging.
In which fields is PET plastic most widely used?
Primarily used for beverage bottles, food containers, textile fibers (polyester) and film packaging, also for electronic components and automotive parts.
What is the temperature resistance of PET plastic?
Standard PET resists up to 70°C, while crystallized PET can withstand over 120°C, but may deform at high temperatures.