Foaming or Blowing Agents
These special chemicals, when included into plastics, will release gas, developing a controlled cellular inside structure.
The end-blown product will show reduced weight with unchanged volume, good surface texture, regular moulding shrinkage, etc.
Blowing Agents are recommended for injection moulding, film and thread extrusion and other application involving a weight reduction.
Blowing Agents are divided into 2 categories:
- Exothermic: evolving heat and nitrogen during the blowing reaction.
- Endothermic: absorbing heat and developing mainly carbon dioxide.