-
Name
Talc
- EINECS 238-877-9
- CAS No. 14807-96-6
- Article Data28
- CAS DataBase
- Density 2.7-2.8 g/cm3
- Solubility Insoluble in water, cold acids, alkalies.
- Melting Point 800 °C
- Formula H2Mg3O12Si4
- Boiling Point
- Molecular Weight 379.266
- Flash Point
- Transport Information
- Appearance white to almost white micro fine powder
- Safety 36
- Risk Codes 20-37
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Molecular Structure
-
Hazard Symbols
Xn
- Synonyms Beaver White 200;Beaver White 325;CS 2 (talc);CT 8 (mineral);Emtal596;FVS;FW-XO;Fabi HTP Ultra 5C;Finntalc M 15;Finntalc M15E;Finntalc M 20SL;Finntalc M 30SL;HS-T 0.5;HST 05;HT 7000;HT 7050;HTP 05;HTP 1C;HTP Ultra 1C;HTP Ultra 5C;HTP-Ultra 10C;HTP-Ultra 5;HWST;HeliocoteX;Hi-Con Talc C 12;Hi-Filler;Hi-Filler 10;
- PSA 197.00000
- LogP -2.89430
Synthetic route
| Conditions | Yield |
|---|---|
| With KOH In melt Mg(NO3)2 was added to an eutectic melt of KNO3/LiNO3 at 350 °C, followed by a melt of SiO2 in KOH;; the pptd. prod. was either isolated by filtration of the melt through a layer of compressed quartz powder or by leaching the cooled mass with water, alcohol, or acetone; |
| Conditions | Yield |
|---|---|
| With KOH In melt MgCl2 was added to an eutectic melt of KCl/LiCl, followed by a melt of SiO2 in KOH;; the pptd. prod. was either isolated by filtration of the melt through a layer of compressed quartz powder or by leaching the cooled mass with water, alcohol, or acetone; |
| Conditions | Yield |
|---|---|
| In neat (no solvent, solid phase) mixt. homogenized by rubbing in agate mortar for 15 min, mechanochemicaltreatment for 12 h; XRD; |
| Conditions | Yield |
|---|---|
| With silicic acid In water silica sol with aq. dispersion of silicic acid heated to 60 °C, Mg(OH)2 added in small portions for 30 min, stirred for 42 h; XRD; |
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14807-96-6
magnesium silicate
| Conditions | Yield |
|---|---|
| Stage #1: magnesium silicate; bismuth(III) nitrate; tetraamminepalladium(II) nitrate at 125℃; for 8h; Stage #2: With oxygen at 300℃; for 2h; |
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14807-96-6
magnesium silicate
| Conditions | Yield |
|---|---|
| Stage #1: magnesium silicate; tetramminepalladium(II) chloride at 125℃; for 8h; Stage #2: With oxygen at 300℃; for 2h; |
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14807-96-6
magnesium silicate
| Conditions | Yield |
|---|---|
| Stage #1: magnesium silicate; tetramminepalladium(II) chloride; tetraamineplatinum(II) hydroxide at 125℃; for 8h; Stage #2: With oxygen at 300℃; for 2h; |
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-
14807-96-6
magnesium silicate
| Conditions | Yield |
|---|---|
| Stage #1: magnesium silicate; tetraamineplatinum(II) hydroxide at 125℃; for 8h; Stage #2: With oxygen at 300℃; for 2h; |
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-
14807-96-6
magnesium silicate
| Conditions | Yield |
|---|---|
| Stage #1: magnesium silicate; tetraamineplatinum(II) hydroxide at 125℃; for 8h; Stage #2: With oxygen at 300℃; for 2h; |
| Conditions | Yield |
|---|---|
| In neat (no solvent) MgO reacted with talc at 800-1070 °C forming Mg2SiO4;; | |
| In neat (no solvent) MgO reacted with talc at 800-1070 °C forming Mg2SiO4;; |
| Conditions | Yield |
|---|---|
| In sodium hydroxide; water High Pressure; mixt. of MgO and Mg3Si4O10(OH)2 (mol ratio MgO:SiO2=3:2) hydrothermally heated with water and aq. NaOH at temps. 200-500°C and pressure 10-100 MPa; ppt. washed and dried, elem. anal.; |
Talc Consensus Reports
IARC Cancer Review: Group 1 IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 349.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1987,p. 185.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Reported in EPA Talc (CAS NO.14807-96-6) Inventory.
Talc Standards and Recommendations
ACGIH TLV: Human Carcinogen; TWA >2 mg/m3, Respirable Dust
Talc Specification
The Talc, with the CAS registry number 14807-96-6, is also known as Cosmetic talc; Magnesium silicate talc. It belongs to the product inorganic chemical industry. Its EINECS number is 238-877-9. What's more, its systematic name is Talc. And it is finely powdered native hydrous magnesium silicate. It is used as a dusting powder, either alone or with starch or boric acid, for medicinal and toilet preparations. It is also an excipient and filler for pills, tablets, and for dusting tablet molds. The Talc may cause damage to health. It is Harmful by inhalation, Irritating to the respiratory system. Whenever you will contact it, please wear suitable protective clothing.
Preparation of Talc: Talc is found chiefly in the metamorphic rocks, often those of a more basic type because of the alteration of the minerals mentioned above. Talc is primarily formed via hydration and carbonation of serpentine, via the following reaction,
2Mg3Si2O5(OH)4 + 3CO2 → Mg3Si4O10(OH)2 + 3 MgCO3 + 3 H2O
Talc can also be made via a reaction between dolomite and silica, which is typical of skarnification of dolomites via silica-flooding in contact metamorphic aureoles,
3CaMg(CO3)2 + 4 SiO2 + H2O → Mg3Si4O10(OH)2 + 3 CaCO3 + 3 CO2
You can still convert the following datas into molecular structure:
(1)InChI:InChI=1S/3Mg.2HO3Si.2O3Si/c;;;4*1-4(2)3/h;;;2*1H;;/q3*+2;2*-1;2*-2;
(2)InChIKey:InChIKey=KNXVOGGZOFOROK-UHFFFAOYSA-N;
(3)Smiles:[Si](O)(=O)[O-].[Si]([O-])(O)=O.[Si](=O)([O-])[O-].[Si](=O)([O-])[O-].[Mg+2].[Mg+2].[Mg+2];
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