tridymite
- CAS No.
- 15468-32-3
- Chemical Name:
- tridymite
- Synonyms
- tridymite;Tridimite;SILICAFLOUR;Christensenite;ALPHA-TRIDYMITE;MONOMERICSILICA;Tridymite (SiO2);Einecs 239-487-1;Tridimite [french];Tridymite Total dust
- CBNumber:
- CB9882023
- Molecular Formula:
- O2Si
- Molecular Weight:
- 60.08
- MDL Number:
- MFCD01776321
- MOL File:
- 15468-32-3.mol
| 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 |
|
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| EWG's Food Scores | 4 | ||||||||||||||
| EPA Substance Registry System | Tridymite (15468-32-3) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS08 |
|---|---|
| Signal word | Danger |
| Hazard statements | H372 |
| Precautionary statements | P260-P264-P270-P314-P501 |
| OEB | D |
| OEL | TWA: 0.05 mg/m3 |
tridymite Chemical Properties,Uses,Production
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.
Chemical Properties
Silicon dioxide/crystalline silica is a component of many mineral dusts and materials which melts to a glass at very high temperature.
Definition
Tridymite: A mineral form of silicon(IV) oxide, SiO2.
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
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.
Incompatibilities
Violent reactions with powerful oxidizers: fluorine, chlorine trifluoride; manganese trioxide; oxygen difluoride, hydrogen peroxide, etc.; acetylene; ammonia.
Waste Disposal
Sanitary landfill
tridymite Preparation Products And Raw materials
Raw materials
Preparation Products
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Henan Tianfu Chemical Co.,Ltd. | +86-0371-55170693 +86-19937530512 | info@tianfuchem.com | China | 21667 | 55 |
| LEAP CHEM CO., LTD. | +86-852-30606658 | market18@leapchem.com | China | 24738 | 58 |
| PT CHEM GROUP LIMITED | peter68@ptchemgroup.com | China | 35426 | 58 | |
| GIHI CHEMICALS CO.,LIMITED | +8618058761490 | info@gihichemicals.com | China | 50000 | 58 |
| Chizhou Kailong Import and Export Trade Co., Ltd. | xg01_gj@163.com | China | 9503 | 50 |
| Supplier | Advantage |
|---|---|
| Henan Tianfu Chemical Co.,Ltd. | 55 |
| LEAP CHEM CO., LTD. | 58 |
| PT CHEM GROUP LIMITED | 58 |
| GIHI CHEMICALS CO.,LIMITED | 58 |
| Chizhou Kailong Import and Export Trade Co., Ltd. | 50 |
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