FUSiO2N SP from Rex Materials is specially formulated for thimbles that are used in Wagstaff billet casting machines. FUSiO2N SP is an extremely fine grained, sintered composition of high purity fused silica that provides both outstanding wear properties and excellent thermal shock resistance. Special non-wetting properties, plus factory coating with boron nitride, prevent metal sticking and attack by aluminum and other molten metals. FUSiO2N SP has passed all the major aluminum resistance tests specified by the leading Aluminum Producers.
The lower thermal mass and conductivity minimize the chance of freeze ups during the start up or at low metal flow rates. Our special FUSiO2N SP process allows us to offer this outstanding performance at a very reasonable price. Our process has been designed so that the inside metal contact surface of our thimbles have virtually no porosity.
Customer’s testing concludes that FUSiO2N SP lasts longer than traditional fused silica thimbles. we are so confident that you will be satisfied with the performance that we offer a money back guarantee!
| Physical Properties | ||||
| SS | SL | SP | Foam F50 | |
| Bulk Density, lbs./ft³ (kg/m³) | 106 (1700) | 107 (1715) | 110 (1760) | 50 (800) |
| Modulus of Rupture, psi (MPa), at: | 1500 (10) | 1000 (7) | 1900 (13) | 400 (3) |
| Cold Crushing Strength, psi (MPa) | 5000 (34) | 4000 (28) | 6000 (40) | 1000 (7) |
| Apparent Porosity, % | 25 | 25 | 22 | 65 |
| Thermal Expansion, x10-6/ºF (x10-6ºC) | 0.4 (0.7) | 0.4 (0.7) | 0.4 (0.7) | 0.4 (0.7) |
| Thermal Conductivity, BTU-in/Hr-ft²-ºF (W/m-k) at: | ||||
| 500ºF (260°C) | 4.9 (0.71) | 4.9 (0.71) | 5.1 (0.74) | 1.0 (0.14) |
| 1000°F (538ºC) | 5.8 (0.84) | 5.8 (0.84) | 6.1 (0.88) | 1.4 (0.20) |
| 1500ºF (816ºC) | 6.7 (0.97) | 6.7 (0.97) | 7.0 (1.0) | 1.7 (0.24) |
| 2000ºF (1093ºC) | 7.3 (1.05) | – | – | 2.8 (0.40) |
| Specific Heat, BTU/lb-ºF | 0.17 (710) | 0.17 (710) | 0.17 (710) | 0.17 (710) |
| Maximum Use Temperature, ºF (ºC) | 2000 (1090) | 1600 (870) | 1600 (870) | 2000 (1090) |
| Chemical Analysis, % | ||||
| SS | SL | SP | Foam F50 | |
| SiO2 | 98 | 94 | 95 | 98 |
| Al2O3 | 0.4 | 1.4 | 2.0 | 0.4 |
| Fe2O3 | 0.1 | 0.1 | 0.1 | 0.1 |
| CaO | 1.4 | 1 | 0.7 | 1.4 |
| Alkalies | trace | trace | trace | trace |
| Other | trace | ~2 | ~2 | trace |
