PVC Dezhou Shihua SG‑5
PVC Dezhou Shihua SG‑5
Material Introduction: PVC Dezhou Shihua SG‑5 is a widely‑used general‑purpose polyvinyl chloride resin produced by suspension‑polymerization, normally in white‑powder form. Thanks to balanced processability, favorable physical‑mechanical performance of finished products and excellent chemical stability, it is widely used for both rigid and flexible articles.
Main Applications
Rigid products: rigid pipes (building pipes, agricultural irrigation pipes), special‑shaped profiles (door‑window profiles), boards, sheets, injection‑molded pipe fittings, etc.
Soft products: insulation layers and sheaths for wires and cables, artificial leather, films, etc.
Transparent products: transparent soft compounds can be produced by adding appropriate plasticizer (approx.120 PHR) and properly controlling processing temperature and duration.
Other fields: packaging materials, daily‑consumer goods, etc.
Physical Properties
| Test Item | Test Condition | Test Standard | Reference Value (Superior Grade) | Unit | Remarks |
|---|---|---|---|---|---|
| Viscosity Number | ‑ | ‑ | 107‑118 | mL/g | or average degree of polymerization 1000‑1100 |
| K‑Value | ‑ | ‑ | 66‑68 | ‑ | |
| Bulk Density | ‑ | ‑ | ≥0.45 | g/ml | |
| Volatile Matter Content | Including water | ‑ | ≤0.40 | % | |
| Sieve Residue (0.25 mm sieve) | ‑ | ‑ | ≤2.0 | % | |
| Fish‑eye Count | ‑ | ‑ | ≤20 | pcs/400cm² | |
| Plasticizer Absorption | ‑ | ‑ | ≥20 | g/100g resin | |
| Impurity Particle Count | ‑ | ‑ | ≤16 | pcs | |
| Whiteness (160℃, 10 min) | ‑ | ‑ | ≥74 | % | |
| Residual Vinyl Chloride Monomer | ‑ | ‑ | ≤8 | μg/g (ppm) |
Processing Parameters
| Process Step / Parameter | Unit / Condition | Reference Value / Range | Remarks & Description |
|---|---|---|---|
| Material Pre‑treatment | ‑ | Normally no drying required | Proper drying shall be performed if moisture‑absorbed |
| Extruder Barrel Temperature (Rigid Products) | ‑ | Note: PVC is heat‑sensitive; thermal stabilizer must be added | |
| Feed Section (Zone 1) | ℃ | 150‑165 | For reference; adjust according to formulation and equipment |
| Compression Section (Zone 2) | ℃ | 165‑175 | For reference; adjust according to formulation and equipment |
| Metering Section (Zone 3) | ℃ | 175‑185 | For reference; adjust according to formulation and equipment |
| Extrusion Die Temperature | ℃ | 180‑190 | For reference; adjust according to formulation and equipment |
| Injection Molding Barrel Temperature | ‑ | Note: PVC is heat‑sensitive; thermal stabilizer must be added | |
| Rear zone | ℃ | 150‑160 | For reference; adjust according to formulation and equipment |
| Middle zone | ℃ | 160‑170 | For reference; adjust according to formulation and equipment |
| Front zone | ℃ | 170‑180 (do not exceed 190 °C) | For reference; adjust according to formulation and equipment |
| Injection Nozzle Temperature | ℃ | 160‑170 | For reference; adjust according to formulation and equipment |
| Melt Temperature | ℃ | 170‑190 | Never exceed 210 °C to avoid decomposition |
| Injection Pressure | bar | up to 1500 | |
| Screw Speed (Extrusion) | rpm | Adjust by equipment and product | Avoid high speed to prevent shear‑caused overheating |
| Mold Temperature (Injection Molding) | ℃ | 30‑60 | |
| Thermal Stability Reminder | ‑ | Stabilizer addition is mandatory | PVC tends to decompose under over‑heating or long‑time heat exposure. Sufficient high‑efficiency thermal stabilizer shall be added into formulation. |
Disclaimer: All above data is for reference only.
