PVC S70 resin is a general-purpose suspension polyvinyl chloride (S-PVC) grade with a medium molecular weight and well-balanced processing performance. It typically features a K-value around 70, making it one of the most widely used PVC grades in industrial applications.

With its excellent balance between rigidity, processability, and cost efficiency, PVC S70 is suitable for a broad range of rigid and semi-rigid products, especially in extrusion and injection molding applications.

Property

Value

K-Value

68–72

Bulk Density

0.50–0.58 g/cm³

Volatile Content (Moisture)

≤ 0.30%

Residue on 250 μm Sieve

≤ 1.0%

Residue on 63 μm Sieve

≥ 95%

Whiteness

≥ 75–85

Plasticizer Absorption

20–26 g/100g

Performance Features of PVC S70

  • Excellent Processing Performance. PVC S70 offers a well-controlled molecular weight distribution, ensuring stable plastification and smooth melt flow during processing. It is suitable for various standard extrusion and injection molding equipment.
  • Good Mechanical Properties. Products made from PVC S70 exhibit high rigidity and satisfactory impact resistance, meeting the structural requirements of construction and industrial applications.
  • Stable Thermal Processing Behavior. The resin demonstrates excellent thermal stability within normal processing temperature ranges, enabling consistent performance during continuous production.
  • Strong Formulation Flexibility. PVC S70 is compatible with a wide range of plasticizers, stabilizers, fillers, and processing aids, allowing flexible formulation design for different application requirements.
  • Cost-Effective Solution. As a general-purpose PVC grade, S70 provides an optimal balance between performance and cost, making it highly suitable for large-scale industrial production.

Main Applications of S-70

  • PVC Pipes. Widely used in water supply pipes, drainage systems, and electrical conduit pipes, offering excellent rigidity and pressure resistance.
  • PVC Profiles. Suitable for window profiles, decorative profiles, and structural profiles with good dimensional stability and weather resistance.
  • PVC Sheets and Panels. Used in construction panels, advertising boards, and industrial sheet applications.
  • Injection Molded Products. Applicable for fittings, valve housings, and various electrical components.
  • Flexible Products (with formulation adjustment). When properly compounded with plasticizers, PVC S70 can also be used in flexible applications such as hoses, cable compounds, and synthetic leather.

Processing Guidelines

  • Processing Methods: Extrusion, injection molding, and calendering.
  • Processing Temperature: 160–200°C (depending on formulation).
  • Recommended Stabilizers: Calcium-zinc or organotin stabilizer systems.
  • Lubrication System: Should be optimized according to product type.
  • Mixing: High-speed mixing is recommended to ensure uniform plastification.

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