1318-02-1
| Name | Zeolite |
| CAS | 1318-02-1 |
| EINECS(EC#) | 215-684-8 |
| Molecular Formula | AlNaO6Si2 |
| MDL Number | MFCD00131613 |
| Molecular Weight | 202.14 |
| MOL File | 1318-02-1.mol |
Chemical Properties
| Occurrence | Aluminosilicates are obtained directly from the aluminosilicate rocks or as synthetic materials. These oxides have the general formula: mAl2O3 . nSiO, e.g., andalusite, sillimanite, disthene, kaolinite, topaz, and mullite. Natural aluminosilicate powders used in investment casting are supplied with various Al2O3 content, such as 42–47% (e.g., Molochite) and 60% (e.g., Remasil, Mulgrain), and with gradation in the range of 325# 120#. The higher the content of Al2O3 in the powder, the higher its resistance to temperature. Most common contaminants in aluminosilicate powder are: Fe2O3, TiO2, and ZrO2, while the content of CaO, MgO, K2O, P2O5, and Cr2O3 is very small. An important advantage of aluminosilicate powders is their availability and low price of about 0.5 €/kg. Mullite 3Al2O3 . 2SiO2 is a mineral that is rarely found in nature (known deposits on the Isle of Mull, Scotland). For industrial purposes, synthetic mullite is used almost exclusively (sintered or melted) with particle sizes up to: 0.07, 0.12, 0.25–0.5, 0.5–1.0 mm and of white color. The raw material is milled and fractionated for a suitable grain size matrix of the ceramic powders and stucco. The melting point of mullite is 1810 ℃ and density is 3.05 g/cm3, which does not depend on the temperature. It is characterized by high resistance to creep and thermal shock due to a low coefficient of thermal expansion and a low thermal conductivity. Synthetic mullite is characterized by a high chemical purity—total content of impurities does not exceed 0.5 wt%. The price is high (about 2.5 V/kg), thus it is used for ceramic molds for casting turbine blades with a DS or SC microstructure. |
| Melting point | >1600°C |
| density | 1.9~2.3g/cm3 |
| storage temp. | Store at RT. |
| form | powder |
| pka | 10.348[at 20 ℃] |
| color | White |
| Odor | wh., odorless powd. |
| PH | 8-11 (H2O) |
| Water Solubility | Insoluble in water. |
| Sensitive | Hygroscopic |
| Exposure limits | ACGIH: TWA 10 mg/m3 OSHA: TWA 15 mg/m3 NIOSH: IDLH 5000 mg/m3; TWA 2.4 mg/m3; TWA 0.3 mg/m3 |
| IARC | 3 (Vol. 68) 1997 |
| EPA Substance Registry System | Zeolites(1318-02-1) |