PVC Resin SG5 (K65 K66 K67 Grade) Polyvinyl Chloride Plastic Raw Material

PVC Resin SG5 (K65 / K66 / K67 Grade) is a general-purpose suspension Polyvinyl Chloride (PVC) resin, widely used in pipes, profiles, films, and cables. It offers excellent processing performance and stable physical properties, making it one of the most commonly used plastic raw materials in industrial manufacturing.

Key Highlights:

• Excellent processability, suitable for various forming methods (extrusion / injection molding)
• Good mechanical strength and dimensional stability for long-term use
• Stable supply, supporting bulk purchase and global export

As a professional plastic raw material supplier, ZiJun Plastics is committed to providing high-quality PVC resin and comprehensive technical support to meet the application needs of different industries.

Technical Specifications and Testing Conditions (Technical Data Sheet – TDS)

Typical Physical Properties

Property	Value	Test Method	Test Condition
K Value	65 / 66 / 67	ISO 1628	–
Bulk Density	0.45 – 0.55 g/cm³	ASTM D1895	Room Temperature
Volatile Content	≤ 0.40%	ASTM D3030	105°C
Residue on Sieve	≤ 0.25%	ASTM D1921	40 mesh sieve
Whiteness	≥ 80	ASTM E313	–
Plasticizer Absorption	≥ 19 g/100g	ASTM D3367	–
Tensile Strength	≥ 45 MPa	ASTM D638	23°C
Notched Impact Strength	≥ 5 kJ/m²	ISO 179	23°C
Vicat Softening Temp	≥ 75°C	ASTM D1525	1kg load

Note: The K value (K65-K67) represents the molecular weight range of PVC. Higher values indicate better mechanical performance but slightly higher processing difficulty.

Key Applications

PVC SG5, a medium-polymer resin, has a wide range of applications across industries:

1. Construction & Pipe Systems

• Water supply and drainage pipes (PVC-U Pipes)
• Electrical conduits
• Window profiles
  Advantage: Good rigidity, corrosion resistance, long service life

2. Packaging & Films

• Agricultural films
• Flexible packaging films
  Advantage: Good transparency and flexibility (requires plasticizer)

3. Wire & Cable

• Cable sheathing
  Advantage: Excellent insulation and flame-retardant properties

4. Injection Molding Parts

• Pipe fittings
• Industrial components
  Advantage: Moderate flowability, good dimensional stability

Product Comparison

PVC SG5 vs PVC SG3 / SG8

Comparison	SG3	SG5	SG8
K Value	Low (~60)	Medium (65-67)	High (68+)
Molecular Weight	Low	Medium	High
Processing Difficulty	Easy	Moderate	Difficult
Mechanical Strength	General	Good	Excellent
Typical Application	Films	Pipes / Profiles	High-strength parts

Conclusion: SG5 provides the best balance between performance and processability.

PVC vs PE (Polyethylene)

Comparison	PVC	PE
Cost	Medium	Low
Rigidity	High	Low
Heat Resistance	Better	General
Corrosion Resistance	Excellent	Excellent
Applications	Pipes, cables	Films, containers

Conclusion: PVC is more suitable for structural applications, while PE is better for flexible products.

Processing Guidelines

Extrusion

• Processing temperature: 160 – 190°C
• Mold temperature: 30 – 60°C
• Screw speed: 20 – 60 rpm

Injection Molding

• Barrel temperature: 170 – 200°C
• Mold temperature: 20 – 50°C
• Injection pressure: 60 – 120 MPa

Compounding Suggestions

• Add heat stabilizers to prevent thermal degradation
• Add plasticizers (e.g., DOP) as needed to adjust flexibility

Precautions

• PVC is heat-sensitive; avoid prolonged high-temperature residence
• Use dehumidifying equipment to control moisture
• Ensure proper venting during processing to prevent bubbles

FAQ

1. What is the difference between PVC SG5 and SG3?

SG5 has a higher K value and molecular weight, offering better mechanical strength, suitable for pipes and profiles; SG3 is more suitable for films.

2. Does PVC SG5 require drying?

Generally not required, but if storage humidity is high, short-term drying at 60–80°C is recommended to improve processing stability.

3. Is PVC SG5 suitable for injection molding?

Yes. SG5 has good flowability and molding stability, suitable for pipe fittings and industrial components.

4. Is PVC SG5 environmentally friendly?

PVC itself is recyclable. Proper use of stabilizers and additives ensures compliance with RoHS or REACH standards.

If you are looking for a stable, high-quality PVC resin supplier, ZiJun Plastics can provide professional selection guidance and long-term support. Contact us for samples and quotations.