The blowing agents p-toluenesulphonyl semicarbazide and 5-phenyltetrazole expand at higher temperatures than other chemical blowing agents.
With little risk of pre-foaming, they are widely used for foaming acrylonitrile butadiene styrene (ABS), rigid PVC, polyamide, high-density polyethylene (HDPE) and other plastics that are processed at high temperatures.