General Processing Aids
The main function of general processing AIDS is to promote plasticization of materials, improve melt fluidity, moderate viscosity, moderate melt strength, and wide processing range. The product can be widely used in various PVC products.
Product Description
Shitong supplies a range of high-performance PVC processing aids designed to promote PVC fusion, improve melt strength, optimize melt flow and support stable production. Our products are suitable for rigid, semi-rigid and foamed PVC formulations processed by extrusion, injection molding and calendering.
As acrylic polymer additives, PVC processing aids improve the rheological behavior of PVC compounds during processing. They help PVC particles fuse more uniformly, strengthen the molten material and create a smoother, more homogeneous melt. This can improve processing efficiency, dimensional stability and the surface appearance of finished PVC products.
Shitong offers multiple PVC processing aid grades, including P-530A, SG-828, SG-125, SG-401 and SG-801, allowing manufacturers to select a suitable product according to their formulation, equipment and required melt strength.
| Index | Unit | P-530A | SG-828 | SG-125 | SG-401 | SG-801 |
| Bulk density | g/cm3 | 0.45±0.10 | 0.45±0.10 | 0.45±0.10 | 0.45±0.10 | 0.45±0.10 |
| Sieve residue (30 mesh) | % | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 |
| Volatile Content (%) | % | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 |
| Intrinsic Viscosity (η) | η | 6.8±0.2 | 5.5±0.2 | 5.2±0.2 | 6.8±0.5 | 12.5±0.5 |
PVC resin does not melt in the same way as many conventional thermoplastics. During processing, PVC particles must gradually fuse into a uniform molten material.
PVC processing aids increase friction and heat transfer between resin particles, helping the compound reach a homogeneous fused state more efficiently. Improved fusion can contribute to more stable extrusion, better material consistency and fewer processing defects.
PVC processing aids increase the strength and elasticity of the PVC melt. Higher melt strength helps the material maintain its shape after leaving the die and before cooling.
This property is especially important for:
PVC profiles
Foam boards
Foam pipes
Thin sheets
Calendered products
Products with complex cross-sections
For PVC foam products, sufficient melt strength also helps retain gas during foaming and supports a finer, more uniform cellular structure.
The addition of a suitable processing aid helps produce a more uniform PVC melt. Better melt homogeneity can reduce unmelted particles, gels, flow marks and differences in the appearance of finished products.
A homogeneous melt also helps pigments, fillers, stabilizers and other additives distribute more evenly throughout the compound.
PVC processing aids can help reduce surface defects and improve smoothness and gloss. They are therefore widely used in products where appearance and surface consistency are important, such as window profiles, decorative panels, transparent sheets and furniture boards.
Changes in temperature, screw speed, filler content and raw-material batches can affect PVC processing. A suitable processing aid can provide a wider and more stable processing window, helping manufacturers maintain consistent production under changing operating conditions.
Processing aids can improve the incorporation and distribution of calcium carbonate and other mineral fillers in PVC compounds. This is particularly useful in highly filled profiles, flooring, sheets, pipes and foam boards.
The final filler level should still be balanced with the required mechanical properties, surface quality and processing performance.
PVC processing aids are widely used in rigid PVC pipes and injection-molded fittings. They promote fusion, improve melt uniformity and support smoother extrusion or mold filling.
Typical applications include:
Water supply pipes
Drainage pipes
Electrical conduits
Pressure pipes
Sewer pipes
Pipe fittings
Elbows, tees and couplings
The appropriate grade should be selected according to the extrusion speed, filler level, pipe diameter and required surface finish.
In PVC profile extrusion, processing aids help achieve uniform plasticization and stable melt strength. This supports dimensional consistency after the profile exits the die and can improve the appearance of visible surfaces.
They can be used in:
Window profiles
Door profiles
Siding
Fencing profiles
Decorative profiles
Cable trunking
Technical extrusion profiles
Foamed PVC formulations require significantly higher melt strength than many compact PVC products. The processing aid helps hold the gas generated by the blowing agent and prevents premature collapse of the cellular structure.
Suitable applications include:
PVC Celuka foam boards
PVC free-foam sheets
WPC foam boards
Furniture boards
Cabinet boards
Advertising boards
Decorative panels
For foam applications, the processing aid should be selected together with the foaming regulator, blowing agent, lubricant and calcium carbonate dosage.
PVC processing aids can improve melt homogeneity, surface smoothness and processing consistency in extruded or calendered sheet and film applications.
They may be used in:
Rigid PVC sheets
Transparent PVC sheets
Packaging sheets
Decorative films
Calendered films
Thermoforming sheets
Vinyl flooring layers
For transparent applications, the formulation should use a processing aid grade with suitable compatibility and dispersion performance.
Processing aids support consistent extrusion and surface appearance in PVC wall panels, ceiling panels and decorative boards. They can help reduce flow marks, uneven gloss and surface roughness.
In vinyl flooring and related highly filled PVC products, processing aids help promote fusion and incorporate mineral fillers into the melt. They may be used in rigid flooring, base layers, backing layers and selected LVT formulations.
PVC processing aids can improve melt flow and homogeneity in injection molding, especially for components with complex mold structures.
Typical products include PVC fittings, connectors, valves, electrical components and technical molded parts.
General-purpose PVC processing aids are commonly used to promote fusion, improve melt homogeneity and enhance surface quality in compact PVC products.
High-molecular-weight processing aids provide stronger melt strength and are generally more suitable for foam boards, foam pipes, thick sheets and products requiring higher melt elasticity.
| Type | Main Function | Typical Applications |
| General-Purpose Processing Aid | Promotes fusion and improves melt flow | Pipes, fittings, profiles, sheets and panels |
| High-Molecular-Weight Processing Aid | Provides higher melt strength and elasticity | Foam boards, foam profiles and foam-core pipes |
| High-Efficiency Processing Aid | Balances fusion, output and dosage | High-speed extrusion and highly filled formulations |
| Transparent-Grade Processing Aid | Supports fusion while maintaining clarity | Transparent sheets, films and packaging products |
Shitong can recommend a suitable grade based on your PVC resin, formulation and production requirements.
PVC processing aids and impact modifiers have different primary functions.
A PVC processing aid mainly improves fusion, melt strength, rheology and processing stability. An impact modifier primarily improves the toughness and impact resistance of the finished PVC product.
| Comparison | PVC Processing Aid | PVC Impact Modifier |
| Primary Purpose | Improve processing performance | Improve impact strength |
| Main Effect | Fusion, melt flow and melt strength | Toughness and crack resistance |
| Processing Benefit | Improves melt homogeneity and surface quality | Helps reduce brittle failure |
| Common Applications | Pipes, profiles, sheets and foam products | Profiles, pipes, fittings and panels |
Some formulations require both products to achieve the desired processing performance and final mechanical properties.
Shandong Shitong Polymer Materials Co., Ltd. supplies PVC additives for pipe, profile, sheet, panel, flooring and foam-product manufacturers.
Our PVC processing aid solutions offer:
Multiple grades for different PVC applications
Stable bulk density and particle control
Reliable fusion-promotion performance
Improved melt strength and homogeneity
Support for compact and foamed PVC products
Consistent production quality
Technical product-selection support
Bulk supply for industrial customers
Customers can provide their formulation, product application, processing method and current production problems. Our team will help evaluate the requirements and recommend a suitable processing aid grade.
PVC processing aids are polymer additives used to improve the processing behavior of PVC compounds. They promote resin fusion, improve melt strength and homogeneity, and help produce smoother and more consistent finished products.
Most commonly used PVC processing aids are high-molecular-weight acrylic polymers. Different molecular weights and structures are available for general-purpose, high-melt-strength, transparent and foam applications.
Its primary functions are to promote PVC fusion, improve melt strength, control melt rheology and expand the processing window.
They are commonly used in PVC pipes, fittings, profiles, sheets, films, wall panels, flooring, foam boards and injection-molded products.
Yes. High-molecular-weight processing aids are widely used in PVC foam formulations because they increase melt strength and help control the foam-cell structure.
Their primary purpose is not impact modification. A separate acrylic or CPE impact modifier may be required when the finished product needs greater toughness and impact resistance.
Grade selection depends on the product, processing method, filler content, extrusion speed and required melt strength. Compact products generally use a general-purpose grade, while foamed products usually require a higher-molecular-weight product.
Yes. Better fusion and melt homogeneity can contribute to a smoother, more uniform surface. The final gloss also depends on resin, fillers, lubricants, processing conditions and die quality.
There is no single dosage suitable for every formulation. The amount should be determined according to the resin, equipment, filler level and desired fusion behavior. Production testing is recommended before finalizing the formulation.
Looking for a reliable PVC processing aids manufacturer and supplier?
Contact Shitong with your PVC product type, formulation, processing method, current production issue and required order quantity. We can recommend a suitable grade and provide product specifications, technical support and quotation information.
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