Foaming Regulators
Foaming regulators are super-molecular weight copolymer, super high intrinsic viscosity can endow PVC material with high melt strength to avoid bubble holes breaking therefore making uniform and tight cell structure. It suits for PVC foaming products, such as: advertising board, wood veneer, wall board, furniture bathroom board, carbon crystal board, WPC floor, foam profiles, foam lines, etc.
Product Description
| Index | Foam Sheet 3-8mm | Foam Sheet 8-12mm | Foam Sheet 12-20mm | Foam Sheet >20mm | |
| SG-530 | SG-100 | SG-90 | SG-901 | SG-921 | |
| Bulk Density (g/cm3) | 0.45±0.1 | 0.45±0.1 | 0.45±0.1 | 0.45±0.1 | 0.45±0.1 |
| Sieve Residue (30mesh) (%) | ≤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) | 11.0-13.0 | 14.5-15.5 | 14.5-15.5 | 15-16 | 15-16 |
| Index | SG-530 | SG-100 | SG-90 | SG-901 | SG-921 |
| Dispersibility | ●●●●● | ●●●● | ●●●● | ●●● | ●● |
| Plasticization | ●●●●● | ●●●● | ●●●● | ●●● | ●● |
| Flow ability | ●●●●● | ●●●● | ●●●● | ●●● | ●● |
| Melt Strength | ●● | ●●● | ●●●● | ●●●●●● | ●●●●●● |
During PVC foam extrusion, the polymer melt must have sufficient strength to retain the gas generated by the foaming system. If the melt strength is too low, bubbles can merge or rupture, resulting in large cells, uneven density, surface defects or unstable production.
Adding an appropriate PVC foaming regulator can help:
● Increase PVC melt strength
● Promote more stable PVC fusion and plasticization
● Reduce bubble coalescence and cell rupture
● Produce finer and more uniform cell structures
● Improve foam density consistency
● Improve product surface smoothness and appearance
● Maintain stable processing during continuous extrusion
For advertising boards, furniture boards, bathroom cabinet boards and other PVC foam sheets, the foaming regulator helps control cell expansion and maintain sufficient melt strength during extrusion. This contributes to a more uniform internal structure and consistent board quality.
PVC/WPC formulations contain wood powder or other fillers that can change melt rheology and processing behavior. A suitable WPC foaming regulator helps maintain melt stability and supports uniform foaming during extrusion.
For foamed profiles and decorative lines, stable melt strength is important for controlling dimensions and maintaining the desired surface appearance after the material exits the extrusion die.
As foam sheet thickness and foaming requirements increase, stronger melt support may be required to maintain stable cells inside the material. Shitong offers high-viscosity grades such as SG-901 and SG-921 for applications requiring higher melt strength.
The best foaming regulator cannot be selected only by product name. Selection should be based on the complete PVC formulation and processing conditions.
Important factors include:
● PVC foam board thickness
● Target product density
● Extrusion temperature and screw conditions
● Type and dosage of blowing agent
● Calcium carbonate or other filler loading
● Required fusion speed
● Required melt strength
● Surface and cell-structure requirements
For a new formulation, we recommend providing your PVC resin type, product thickness, current formulation, target density and extrusion conditions. Shitong can help identify a more suitable SG-series grade for trial production.
Shandong Shitong Polymer Materials Co., Ltd. supplies PVC additives for manufacturers of foam boards, WPC products, profiles and other PVC products.
Our SG-series PVC foaming regulators provide manufacturers with multiple viscosity and processing-performance options rather than relying on one universal grade. This allows the regulator to be matched more closely with different board thicknesses, formulations and extrusion requirements.
If you are experiencing unstable foaming, oversized cells, cell rupture, insufficient melt strength or inconsistent foam-board density, send us your current formulation and production requirements. We can recommend a suitable PVC foaming regulator for testing.
No. A blowing agent generates gas to create the foam structure, while a PVC foaming regulator mainly modifies the rheological and melt properties of the PVC compound so the expanding cells can be maintained more effectively during processing.
Adequate melt strength helps the PVC melt retain expanding gas cells before the product cools and solidifies. Insufficient melt strength can cause bubbles to merge or rupture, leading to irregular cell structure and unstable foam density.
Not necessarily. Foam board thickness, formulation, filler level, extrusion conditions and target density can all affect the required regulator performance. Different SG-series grades are available for different production requirements.
Shitong offers SG-530, SG-100, SG-90, SG-901 and SG-921. The appropriate grade should be selected according to your product thickness, formulation, desired melt strength and processing conditions.
Shitong supplies PVC foaming regulators for foam board, WPC, wall panel, furniture board and profile manufacturers. Tell us your product type, board thickness, target density and current formulation, and we can recommend a suitable SG-series foaming regulator for your production line.
Contact Shitong to request product specifications, samples or technical recommendations.
