... It is well known as the most popular and effective chemical foaming agent for PVC,PS,PP,PE,TPR and rubber applicattions. Light ... fine powder. It is one of the most widely used chemical foaming agents due to its non-toxic, odorless, self-extinguishing, ... fire, extinguishing use water spray, carbon dioxide or dry chemical powder. Don't attempt manual fire fighting. Yellow foaming agent Azodicarbonamide