[Selection Guide] The Ultimate PVC Selection Guide: Differentiating SG-3, SG-5, SG-7 & SG-8 for Optimal Application

Choosing the right PVC grade can make or break your project. With four main grades available – SG-3, SG-5, SG-7, and SG-8 – understanding their differences is crucial for optimal application performance and processing efficiency.

Think of polymerization degree as the length of molecular chains. Longer chains (higher polymerization, like SG-3) create stronger, more durable materials, but they're like stirring thick honey – requiring higher temperatures and more force to process. Shorter chains (lower polymerization, like SG-8) flow like water, making them easier to process, but the final products are relatively more brittle.

Core Characteristics: High mechanical strength, excellent wear resistance, superior weather resistance.

Processing Requirements: Higher processing temperatures and pressures are needed.

Best Applications: Perfect for applications demanding exceptional durability. Ideal for premium wire and cable insulation, wear-resistant hoses, outdoor waterproof membranes, and high-quality artificial leather surfaces.

Core Characteristics: Perfect balance between strength and processability – the most versatile grade.

Processing Advantages: Widest process adaptability, handles both soft and rigid applications seamlessly.

Best Applications: This is the most widely used grade in the market. From soft films and artificial leather to rigid pipes and window profiles, SG-5 is the "default choice" for the majority of applications.

Core Characteristics: Excellent flow properties, easily fills complex mold corners and intricate details.

Processing Advantages: Lower processing temperatures, faster molding speeds, reduced energy consumption.

Best Applications: Ideal for thin-walled, complex-structured injection molded products. Examples include various pipe fittings (elbows, tees), valves, electrical housings, and transparent rigid sheets.

Here's a simple guide to help you choose:

Remember: The right PVC grade selection is the foundation of successful production. When in doubt, consult with our technical team for personalized recommendations based on your specific application requirements.