TPGOA Technical Insights
Quick Primer on CFAs
CFAs can be categorized as either endothermic or exothermic, which refers to the type of decomposition they undergo. Endothermic types absorb energy and typically release carbon dioxide and moisture upon decomposition, while the exothermics release energy and usually generate nitrogen when decomposed. The overall gas yield and pressure of gas released by exothermic foaming agents is often higher than that of endothermics.
Blends of these two classes are sometime s utilized for certain applications. Such is the case for profile extrusion, where the high gas pressure and volume from the exothermic portion help fill the profile while the controlled gas yield and cooling from endothermic decomposition reduce profile warpage.
Endothermic CFAs are generally known to decompose in the range of 130 to 230°C (266-446°F), while some of the more common exothermic foaming agents decompose around 200°C (392°F). However, the decomposition range of most exothermic CFAs can be reduced by the addition of certain compounds.
TPG makes every effort to insure that the information contained herein is accurate - however, we accept no liability for the content of this piece, or for the consequences of any actions taken on the basis of the information provided.
Download PDF Version