Retrogression of the flame into the blowpipe neck or body the flame remaining alight.
Note: This manifests itself either as "popping" or "squealing" with a small pointed flame issuing from the nozzle orifice or as a rapid series of minor explosions inside.
Our company is a private firm founded in 1990 with aim to develop export and import with Russia. We do promote EU industrial and consumer goods in Russia and strongly support marketing of Russian and CIS industrial products and services.