GLASSUN refractories consist of mainly high purity fused silica materials. The major products are divided roughly into the GLASSUN Series, shaped by slip casting, the GLASSUN CASTABLE Series of monolithic refractories, and GLASSUN CEMENT.
GLASSUN has many superior properties, including high resistance to thermal shock due to a very low thermal expansion rate, low thermal conductivity, and high corrosion resistance to chemical substances and molten metals. Moreover, it can be fabricated into various sizes, including very large sizes, as well as into complex shapes.

Superior Character of GLASSUN

Expansion Curves of Refractory Materials

Comparison of Thermal Conductivity with other Refractory Materials

Property (Typical Data)

Property/Brand		GLASSUN	GLASSUN-S	HE617	HE616	GLASSUN-E
Apparrent Porosity	%	10.5	9.0	11.7	11.4	11.0 (10.2)
Bulk Density		1.95	1.95	1.90	1.94	1.94 (1.95)
Cold Crushing Strength	Mpa	63.5	68.5	65.8	55.0	65.0 (100)
Modulus of Rupture	MPa	13.1	12.7	-	-	16.0 (25.0)
Thermal Expansion Rate	at 1000%	0.04	0.04	0.04	0.06	0.05 (0.05)
Thermal Conductivity W/m·K	500	0.58	0.58 (0.58)	0.58	0.58	0.58 (0.58)
	1000	1.02	1.02	1.02	1.02	1.02 (1.02)
Refractories under Load	0.2Mpa T2	1260	1260	-	-	1260 (1260)
Thermal Shock Resistance (temp.allowance under accelerated heating and cooling)	Tcleg	1000	1000	1000	1000	1000 (1000)
Chemical Composition	SiO2%	99.7	99.7	99.7	99.0	99.5 (99.5)
Remarks		fine grain, dense structure, for small to medium structure	medium structure to large structure	medium structure to large structure	mechanical press	special additives high strength

* ( )For rolls