- product name Extruded polystyrene (xps) flame retardant masterbatch/mh-3800 - advantages: Improving the materialâ??s toughness, strength and heat resistance. - application: Fire-resistance additive for extruded polystyrene (xps). - specification: Appearance: white special granule Main content: 50%min and 70%min Moisture: 2000 ppm max Application: xps - package and storage: 25kgs kraft bag with plastic lining. Keep in a dry and cool place.