99 High Alumina Support Media is equal Denstone® 99 Support Media. It is inchemical composition99+% alpha alumina and a maximum0.2wt% SiO 2 . Because of its highalumina content and low silica (SiO2 ), it’s a very excellent and ideal product for high temperature and steam applications, such as secondary reformers in ammonia processing, where leached silica will coat downstream equipment or foul the catalyst bed.
99 High Alumina Support Media has very excellent thermal properties, with its high density high-temperature resistance
1550℃, also it’s a good choice for heat retention or equilibration media.For its superior chemical resistance, it’s suitable forapplications in olefin processes, such as ethylene dryers, where there’s the polymerization problem.

Chemical competent	Al2O3	≥99.5%
	SiO2	<0.2%
	Fe2O3	<0.1%
Alkaline matter		<0.1%
Density		3.9 g/cm3
Hardness		9 M
Water absorption		<0.1%
Ruptures trength		>2000kg/cm2
Gas tightness		Kept for ten minutes at negative pressure of 1.3Kpa. The pressure drop is less than 0.3Kpa.
Thermal tolerance		Insert the pipe into the furnace at a depth of 20mm. Heat to 1600ºC and maintain for 30 minutes.
Alkali tolerance		In the Na2CO3 solution of 2N concentration, boil for 15 hours with the weight loss not greater than 20mg/dm2.
Volume resistance		>9*10(5) Ω·cm/1600ºC
Breakdown voltage		20kv/cm
Expansion coefficient		8*10(-8)
Temperature for use		Long-term: 1600ºC Short-term: 1800ºC
Chill and abrupt heat		1500ºC~room temperature not cracking thrice.