| Identification | Back Directory | [Name]
tridymite | [CAS]
15468-32-3 | [Synonyms]
tridymite
Tridimite
SILICAFLOUR
Christensenite
ALPHA-TRIDYMITE
MONOMERICSILICA
Tridymite (SiO2)
Einecs 239-487-1
Tridimite [french]
Tridymite Total dust
Tridymite (SiO2) (9CI)
Tridymite- Respirable dust
CRYSTALLINE-TRIDYMITESILICA
Silica, crystalline tridymite
Silica, crystalline: tridymite
Silica, crystalline - tridymite | [EINECS(EC#)]
239-487-1 | [Molecular Formula]
O2Si | [MDL Number]
MFCD01776321 | [MOL File]
15468-32-3.mol | [Molecular Weight]
60.08 |
| Chemical Properties | Back Directory | [Appearance]
Silicon dioxide/crystalline silica is a component of many mineral dusts and materials which melts to a glass at very high temperature. | [Melting point ]
1470°C | [Boiling point ]
2950°C | [density ]
2.265 | [solubility ]
insoluble in H2O, acid solutions; soluble in HF | [form ]
colorless hexagonal crystals | [color ]
colorless hexagonal, hexane crystals, crystalline | [crystal system]
Triclinic | [Space group]
F1 | [Lattice constant]
| a/nm | b/nm | c/nm | α/o | β/o | γ/o | V/nm3 | | 0.9932 | 1.7216 | 8.1864 | 90 | 90 | 90 | 13.9979 |
| [EPA Substance Registry System]
Tridymite (15468-32-3) |
| Safety Data | Back Directory | [Symbol(GHS) ]
GHS08 | [Signal word ]
Danger | [Hazard statements ]
H372 | [Precautionary statements ]
P260-P264-P270-P314-P501 | [OEB]
D | [OEL]
TWA: 0.05 mg/m3 | [Safety Profile]
Confirmed carcinogen with experimental tumorigenic data. Poison by intratracheal route. Human systemic effects by inhalation: cough, dyspnea. About twice as toxic as shca in causing silicosis. Mutation data reported. See also other shca entries |
| Hazard Information | Back Directory | [Potential Exposure]
Cristobalite is used in the manufacture of water glass, refractories, abrasives, ceramics and enamels. Quartz is used as a mineral, natural or synthetic fiber. Tridymite is used as a filtering and insulating media and as a refractory material for furnace linings. Workers are potentially exposed to crystalline silica in such industries as granite quarrying and cutting, foundry operations; metal, coal, dentistry, painting, and nonmetallic mining; and manufacture of clay and glass products. | [First aid]
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. | [Incompatibilities]
Violent reactions with powerful oxidizers: fluorine, chlorine trifluoride; manganese trioxide; oxygen difluoride, hydrogen peroxide, etc.; acetylene; ammonia. | [Waste Disposal]
Sanitary landfill | [Definition]
Tridymite: A mineral form of silicon(IV) oxide, SiO2. | [Toxics Screening Level]
The Initial Threshold Screening Level for crystalline silica is 3 μg/m3, with an annual
averaging time. This ITSL applies to quartz (CAS No. 14808-60-7) and three polymorphs:
cristobalite (CAS No. 14464-46-1), tridymite (CAS No. 15468-32-3) and tripoli (CAS No.
1317-95-9). |
| Questions And Answer | Back Directory | [Chemical Properties]
A vitreous, colorless, or white native form of pure silica, found variously but not so commonly as quartz. Quartz will change into tridymite with a 16.2% increase in volume at 870C. Unlike quartz, it is soluble in boiling sodium carbonate solution; d 2.28–2.3; Mohs hardness 7.
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| Company Name: |
SKC Inc.
|
| Tel: |
724-941-9701 |
| Website: |
www.skcinc.com |
| Company Name: |
Camida
|
| Tel: |
+353-52-25455 |
| Website: |
www.camida.com |
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