Processing Aids are specialty additives designed to improve the melt processability,
surface quality, and flow characteristics of thermoplastics, particularly PVC (Polyvinyl Chloride). They are generally acrylic-based polymers that do not chemically react with the base resin but modify its rheological behavior, enabling smoother processing and better end-product appearance.
Processing aids are essential in improving throughput, reducing energy consumption, and enhancing product consistency in extrusion, calendaring, and molding processes.
Key Features
- Improves melt fluidity and fusion of PVC compounds
- Enhances surface gloss, smoothness, and dimensional stability
- Promotes faster gelation and improved output rates
- Reduces die build-up, melt fracture, and shrinkage
- Aids in the dispersion of fillers and pigments
- Compatible with rigid and flexible PVC formulations
- Available in multiple grades tailored to different applications
Main Applications
1. Rigid PVC Extrusion
- Pipes, profiles, window frames, siding
- Enhances melt strength and surface finish
- Improves wall thickness control and dimensional accuracy
2. PVC Foamed Sheets & Boards
- Assists in maintaining cell structure and uniform foaming
- Prevents surface defects and improves stiffness
3. PVC Films & Calendering
- Reduces die swell and ensures optical clarity in films
- Allows smoother film formation and improved stretchability
4. Injection Molding
- Improves flowability, cycle time, and demolding characteristics
- Useful in thin-wall or complex mold designs
Technical Specifications
| Property | Specification Range |
|---|---|
| Appearance | White free-flowing powder |
| Polymer Type | Acrylic Copolymer |
| Bulk Density | 0.45 – 0.60 g/cm³ |
| Particle Size (mesh) | 40 – 120 mesh |
| Recommended Dosage | 0.5% – 2.0% by weight |
| Glass Transition Temperature (Tg) | ~100°C – 110°C |
| Compatibility | Rigid & flexible PVC, CPVC |
Types of Processing Aids
| Grade Type | Characteristics & Applications |
|---|---|
| General-Purpose PA | For standard PVC extrusion and molding |
| High-Melt Strength PA | For foamed sheets, WPC, and thick profiles |
| Low-Dose PA | High-efficiency performance at low loading levels |
| High-Speed PA | Optimized for high-output extrusion lines |
| Lubricated PA Grades | Built-in lubrication for easier processing |
Packaging & Storage
- Available in 25 kg moisture-proof bags
- Store in a cool, dry place, away from heat and humidity
- Shelf life: 24 months if unopened and properly stored