Specialty chemicals – Blowing agents

These are chemicals with particular effects, relating either to the manufacturing process or the function of the product. This group comprises:

• Blowing agents. These decompose at elevated temperatures during gas evolution, as include carbon dioxide, nitrogen, bicarbonate, and ammonia. They are used in the manufacturing of cell and foam rubber/plastic. The recommended dosage is 2–8 phr depending on the desired effect and type of blowing agent.