| Customization: | Available |
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| Carrier: | PVC |
| Color: | White |
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Polyvinyl chloride (PVC) is the world's third most widely used plastic and is an attractive alternative to traditional materials such as glass, metal, wood, and other plastic materials because of its versatility, durability, and cost competitiveness. PVC can be tailored by adding modifiers (e.g., plasticizers, stabilizers) to achieve specific properties, categorized into rigid PVC (uPVC) and flexible PVC, making it suitable for diverse industrial and consumer applications.
PVC's exceptional combination of physical and chemical properties makes it one of the most versatile thermoplastics for diverse applications. Its biological and chemical resistance, durability, and adjustable flexibility (through plasticizer addition) enable solutions across multiple industries. The material's compliance with international standards ensures suitability for both industrial and consumer applications, though proper registrations must be obtained for specific end-uses.
Key Applications:
Polyvinyl chloride (PVC) is a versatile thermoplastic polymer with critical applications across multiple industries. In construction, it is widely used for piping systems, window frames, roofing membranes, and cable insulation due to its durability, chemical resistance, and cost-effectiveness. The healthcare sector relies on medical-grade PVC for disposable items like IV tubing, blood bags, and respiratory masks, benefiting from its biocompatibility and sterility. PVC's adaptability also extends to packaging, where rigid films protect consumer goods and flexible variants wrap food products. Additionally, it serves automotive manufacturing through interior components, wiring insulation, and underbody coatings. Its customizable properties, including flame retardancy and weatherability, coupled with recyclability in specialized programs, make PVC indispensable in modern industrial and consumer applications.
Physical Properties
| Parameter | Rigid PVC (uPVC) | Flexible PVC | Test Standard |
|---|---|---|---|
| Density | 1.3-1.45 g/cm³ | 1.1-1.35 g/cm³ | ISO 1183 |
| Tensile Strength | 40-60 MPa | 10-25 MPa | ASTM D638 |
| Elongation at Break | 2-40% | 100-400% | ASTM D638 |
| Flexural Modulus | 2,500-4,000 MPa | 10-100 MPa | ASTM D790 |
| Shore Hardness | D75-D85 (Shore D) | A50-A95 (Shore A) | ASTM D2240 |
| Notched Izod Impact | 2-10 kJ/m² | N/A | ASTM D256 |
| Parameter | Rigid PVC | Flexible PVC | Test Standard |
|---|---|---|---|
| HDT (1.8 MPa) | 65-80°C | 50-60°C | ASTM D648 |
| Continuous Use Temp | -10°C to +60°C | -30°C to +70°C (short-term up to 90°C) | ISO 2578 |
| Vicat Softening Point | 70-90°C | 60-80°C | ISO 306 |
| CLTE | 5-8 ×10-5/K | 7-15 ×10-5 /K | ASTM D696 |
| Parameter | SG3 | SG5 | SG7 | SG8 | Test Standard |
|---|---|---|---|---|---|
| Polymerization Degree (DP) | 1300-1500 | 1000-1100 | 700-800 | 500-600 | GB/T 3402 |
| K-value | 72-75 | 68-71 | 62-65 | 58-61 | ISO 1628-2 |
| Avg. Molecular Weight (×104) | 9.5-11.0 | 7.5-8.5 | 5.5-6.5 | 4.0-5.0 | GPC Method |
| Apparent Density (g/cm³) | 0.42-0.48 | 0.45-0.52 | 0.48-0.55 | 0.50-0.58 | GB/T 3402 |
| Oil Absorption (DOP, %) | 12-18 | 18-25 | 25-32 | 30-38 | GB/T 3400 |
| Thermal Stability (min) | ≥40 (180°C) | ≥30 (180°C) | ≥20 (180°C) | ≥15 (180°C) | GB/T 2917 |
The SG3, SG5, SG7, and SG8 PVC resin grades establish a well-defined application segmentation system based on their degree of polymerization differences.
1. SG3 (DP 1300-1500) specializes in high-end rigid products, with typical applications including chemical-resistant pipes, high-strength sheets, and medical transparent tubes. Its molecular weight of 95,000-110,000 endows the material with exceptional mechanical strength (tensile strength 40-60MPa) and corrosion resistance, though it requires high-temperature/high-pressure processing at 185-205°C.
2. SG5 (DP 1000-1100) serves as a general-purpose rigid resin, widely used in building drainage pipes, window profiles, and electrical conduits. While maintaining structural stability from its 75,000-85,000 molecular weight, it achieves optimal balance between processability and mechanical properties through optimized melt flow index (MFI 5-8g/10min).
3. The flexible applications domain is dominated by SG7 (DP 700-800). With its DOP absorption rate of 25-32%, this grade becomes the preferred material for shoe soles, synthetic leather, and cable jackets. Its designed molecular weight of 55,000-65,000 ensures efficient plastification can be achieved in the medium temperature range of 165-185°C.
4. Ultra-flexible products are exclusively served by SG8 (DP 500-600). Featuring a low molecular weight structure of 40,000-50,000 and plasticizer absorption capacity of 30-38%, this grade enables rapid molding of disposable gloves, packaging films and other products at low temperatures (155-175°C), with unit production costs 15-20% lower than SG7.
Key performance gradients show systematic variations:
Molecular weight decreases progressively from SG3 to SG8, creating an inverse relationship between mechanical strength degradation and flow characteristics improvement
Processing temperature windows shift downward by 80-100°C with notable energy consumption differences
Plasticizer demand shows positive correlation with material flexibility, with SG7/SG8 absorption rates reaching 2-3 times that of SG3
Selection matrix recommendations:
Standard rigid products: Prioritize SG5 (optimal cost-performance solution)
Flexible applications: Designate SG7 (surface gloss ≥85GU)
Special conditions:
• 6MPa-rated pressure pipes: Must use SG3 (burst pressure ≥12MPa)
• Sub-0.1mm ultra-thin films: Requires SG8 (minimum extrusion thickness 0.05mm)
Weifang Phoenix New Material Co., Ltd
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