... .we have series of various plastic mixer unit , such as SRL-Z series mixer unit , SRL-Z 200/500 , SRL-Z 300 ... , SRL-Z 800/1600 , SHL series mixer unit,SHL200A , SHL300A , SHL500A , SHL800A , SHL1000A , horizontal mixer unit SHL 1000/3000 , SHR series mixer ... are made of stainless steel material .2.it's well hermetic with a double sealed closure.3.it has alternative heating ...