Explanation
It is also called volatile foaming agent. It refers to a substance that does not change chemically during use, but generates gas through the change of physical state within a certain temperature range to make plastics and rubber foam. It includes compressed gases (such as CO2, N2, etc.), volatile liquids (such as low boiling point fatty hydrocarbons, halogenated fatty hydrocarbons, etc.), soluble solids, etc.
Classification
Organic polymer materials -> Polymer additives -> Additives