PET Jiangyin Xingye CZ‑318
PET Jiangyin Xingye CZ‑318 is a high‑transparency, low‑impurity bottle‑grade polyester. It delivers high rigidity, good impact resistance, weather resistance and high‑temperature resistance.
Main Applications
Widely used for beverage bottles, edible‑oil bottles, condiment bottles, pharmaceutical bottles, PET sheets and other packaging containers.
Physical Properties
| Property Category |
Item |
Test Standard |
Typical Value CZ‑318 |
Reference Competitor BG85(Yizheng) |
| Basic Properties |
Intrinsic Viscosity (IV) |
GB/T 17931 |
0.84±0.01 dL/g |
0.85±0.02 dL/g |
| |
Density |
ISO 1183 |
1.39 g/cm³ |
1.40 g/cm³ |
| |
Melting Point (Tm) |
DSC |
252℃ |
255℃ |
| Mechanical Properties |
Tensile Strength (MD) |
ASTM D638 |
165 MPa |
160 MPa |
| |
Impact Strength (23℃) |
ASTM D256 |
28 kJ/m² |
25 kJ/m² |
| |
Flexural Modulus |
ISO 178 |
3050 MPa |
2900 MPa |
| Thermal Properties |
Thermal Shrinkage (95℃) |
GB/T 13508 |
≤1.8% |
≤2.0% |
| |
Vicat Softening Point |
ISO 306 |
245℃ |
242℃ |
| Barrier Properties |
Oxygen Transmission Rate (23℃) |
ASTM D3985 |
0.35 cc·mm/m²·day |
0.40 cc·mm/m²·day |
| |
CO₂ Transmission Rate |
ISO 15105‑1 |
1.1 cc·mm/m²·day |
1.3 cc·mm/m²·day |
Pre‑drying Process (Moisture ≤30 ppm)
| Parameter |
Setting Range |
Key Control Points |
| Drying Temperature |
170‑180℃ |
Dew point ≤‑50℃; dehumidifying dryer is mandatory |
| Drying Time |
5‑6 h |
Add 0.5 h under humid condition RH＞60% |
| Hopper holding temp. |
120‑130℃ |
Prevent secondary moisture absorption |
Injection Molding Parameters
| Equipment Section |
Temperature Range(℃) |
Screw Design Suggestion |
| Feed zone (C1) |
260‑270 |
Barrier‑type screw; L/D≥25:1 |
| Plasticizing zone (C2‑C3) |
275‑290 |
Compression ratio 2.8:1‑3.2:1 |
| Metering zone (C4) |
285‑295 |
Strictly avoid＞300℃ for degradation risk |
| Hot runner |
280‑290 |
Runner surface polishing Ra≤0.1 μm |
| Back pressure |
5‑12 MPa |
Excessive back‑pressure raises melt temp by 5‑8℃ |
Blow‑molding Parameters
| Process Step |
Parameter Range |
Optimization Target |
| Pre‑blow pressure |
8‑12 bar |
Primary forming to avoid uneven wall‑thickness |
| Final‑blow pressure |
38‑45 bar |
≥40 bar for high‑heat‑resistant bottles |
| Mold cooling water temp. |
7‑10℃ |
Gradient control: neck 15℃ / bottle body 8℃ |
| Cycle time |
14‑18 s |
Cooling accounts for 60% of total cycle |
Note: All information above is for reference only!
