screw extruder rondol microlab 10 mm l d 20 methyltrihexylphosphonium methylethylphosphinate is added at 3 phosphorous level and silica was 20 weight of phosphinate flame retardant all constituents were first mechanically homogenized and fed continuously into the extruder main feeding zone using a screw type automatic feeder materials were dried under vacuum at 60 u00b0 c for 24 h prior to processing compounding was carried out with a temperature profile of 190 200 205 200 185 u00b0 c at 85 rpm screw speed specimens for characterization and testing were produced by lab scale injection dsm 12 ml injection moulder 190 u00b0 c 10 bar and compression moulding 175 u00b0 c 100 bar techniques mix 30 weight percent of red phosphors into methyltrihexylphosphonium methylethylphosphinate to form a coated stabilized red phosphorous phosphinate composite flame retardant flame retardant is added to polyamide 6 at 3 phosphorous level pbt 6 pellets were dried at 80 u00b0 c for 24 h before mixing pa 6 and flame retardants were mixed in a twin screw extruder thermoprism tse 16 tc staffordshire uk l d 24 at 100 r p m and 230 u00b0 c the extrudate was cut into pellets then successively compression was molded at 230 u00b0 c into test bars for flammability testing eva 80 g methyltrihexylphosphonium ethylmethylphosphinate 3 g low melting glass 5 g and ath alumina trihydrate 12 g are mixed melt blended in a thermo haake rheomix with a screw speed of 60 rpm and the.