The RSLE-56 is flexible(formable), and is composed of silica reinforced ceramic fiber. It molds (shapes), and cuts easily. When dried it becomes a rigid structure. Further heat treatment or exposures to process temperatures significantly increase the physical strength of this material.

With a very low thermal expansion coefficient, combined with its high temperature strength gives it thermal shock resistance not found in other structural ceramic materials. This material also has a low thermal conductivity and is resistant to corrosion. It is an excellent electrical insulator, in addition to having a high chemical purity.



Molten non-ferrous alloys do not bond to the RSLE-56 making it useful in numerous molten metal contact applications. It can also be used in other applications such as : induction coil liners, glass furnace repairs, hot flue linings, hot press insulation, hot face insulation where gas velocity is of concern, casting tables and trough liners.


Properties & characteristics

Temperature 1 200°C (2 192°F)
Nominal composition, wt %
SiO2 99
Other oxides < 1
Organics 0
Solids Content, % by weight 73
Density Dry, g/cc(pcf) 1.36 (84)
Porosity, % 36
Color White
MOR, dry, psi 1100
MOR, 10 hr. to 370°C (698°F), psi 2300
MOR, 16 hr. to 1000°C (1832°F), psi 3800
Compressive strength, dry, room temp. At 8% consolidation, psi 1700
Compressive strength, 16 hr. to 1000°C (1832°F), at 7% consolidation, psi 7200
Dying shrinkage, linear (%) 2
Dying shrinkage, thickness (%) 3
Hardness, Durometer «D»
Dry 54
10 hr. to 370°C (698°F) 70
16 hr. to 1000°C (1838°F) 83
Thermal Conductivity** ASTM C-1113 - W/m°K (BT/hr ft² °F/in)
200°C (392°F) 0.55 (3.8)
400°C (752°F) 0.64 (4.4)
600°C (1112°F) 0.61 (4.2)
800°C (1472°F) 0.67 (4.6)
1000°C (1832°F) 0.75 (5.2)
N.B. The information, details and values indicated are to the best of our knowledge. We recommend to conduct tests according to local conditions. The data is subject to some variations without notice.