Basic information
- Name:
Bentonite
- CAS No.:
1302-78-9
- Molecular Structure:
- Formula:
- Al2O3.4(SiO2).H2O
- Molecular Weight:
- 360.31
- Deleted CAS:
- 10043-07-9|11004-12-9|115628-71-2|12198-92-4|12199-69-8|135945-01-6|37320-72-2|52623-66-2|850872-77-4
- Synonyms:
- Benclay;BentoGrout;Bentonit T;Bentonite AG 3;Berugen;Bragel FF;Bulgarben BA;Clarit BW 100;Clarsol STF;Culvin;Detercal G 2FC;Detersoft GIB;EX 0276;Ex 0030;Exaloid;Filgel;Fulbent 570;GK 129SA3;GK 129SA5;HFGEL160;Haruna;Hi-Jell 1;Hydrocol OW;ImviteFGB;JF 38;K 306;K 306 (mineral);KA 1 (clay);Korthix H;Korthix H-NF;Kunigel GS;KunigelV 2;Kunigel VI;Kunimine VA;Polargel T;Premium Gel;QPC 300;S-Ben;S-Ben X;Steecoben;Steecomull;Tixogel WM;Tone;Tyotix 55M;Gumbrin;881B;Aquagel;AquagelGold Seal;Asama;B 5IC;Baroco;Ben-Gel 11;Ben-Gel15;Ben-Gel 23;Ben-Gel Brite 25;Ben-Gel FW;Ben-Gel HVP;Ben-Gel N 400;LPM 8050;Laundrosil DG;Laundrosil DG-A;Laundrosil DG-A 212;Laundrosil DG-A 462;Laundrosil EX 0242;Laundrosil PR 414;Laviosa AGB;Lightcoat;M-I Gel;M-I GelSupreme;MX 80;Majorbenton B;Meyprofiller K;Mikrofloc S;Monobent W;NaCalit;Nalco 650;Odoearth KH 101;Opazil AO;Opazil EX 408EP;Optigel CG;Optigel CK;Optigel WX;Permont SX 10A;Pitchbent M;Pluxcompact;
- EINECS:
- 215-108-5
- Density:
- 2~3 g/cm3
- Appearance:
- gel, or solid if dry
- Risk Codes:
- 20/22-8
- Safety Description:
- 22-24/25 Details
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Chemistry
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IUPAC Name: Dioxosilane; oxo(oxoalumanyloxy)alumane; hydrate
Molecular Formula: Al2H2O6Si
Molecular Weight: 180.060856 g/mol
EINECS: 215-108-5
Classification Code: Antidotes; Pharmaceutic aid [suspending agent]; Protective Agents; TSCA UVCB; Tumor data
Index of Refraction: 1.503
Molar Refractivity: 56.87 cm3
Molar Volume: 192.2 cm3
Surface Tension: 58.2 dyne/cm
Density: 1.478 g/cm3
Flash Point: 184.7 °C
Enthalpy of Vaporization: 63.02 kJ/mol
Boiling Point: 381.8 °C at 760 mmHg
Vapour Pressure of Bentonite (CAS NO.1302-78-9): 4.93E-06 mmHg at 25 °C
History
In 2005, U.S. was the top producer of bentonite with almost one-third world share followed by China and Greece, reports the British Geological Survey.
The absorbent clay was given the name bentonite by Wilbur C. Knight in 1898 — after the Cretaceous Benton Shale near Rock River, Wyoming. Other modern discoveries include montmorillonite discovered in 1847 in Montmorillon in the Vienne prefecture of France, in Poitou-Charentes, South of the Loire Valley.
Uses
Bentonite is a common component of drilling mud used to curtail drilling fluid invasion by its propensity for aiding in the formation of mud cake.
Bentonite can be used in cement, adhesives, ceramic bodies, and cat litter. Bentonite is also used as a binding agent in the manufacture of taconite pellets as used in the steelmaking industry.
Bentonite, in small percentages, is used as an ingredient in commercially designed clay bodies and ceramic glazes. Bentonite clay is also used in pyrotechnics to make end plugs and rocket nozzles.
Bentonite is therefore uniquely useful in the process of winemaking, where it is used to remove excessive amounts of protein from white wines.
Bentonite has been prescribed as a bulk laxative, and it is also used as a base for many dermatologic formulas. There are also many other medicinal uses for Bentonite and related clays. Clay has been used for healing from prehistoric times onwards. See Medicinal clay.
Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| dog | LDLo | intravenous | 10mg/kg (10mg/kg) | VASCULAR: THROMBOSIS DISTANT FROM INJECTION SITE | Journal of Clinical Investigation. Vol. 42, Pg. 860, 1963. |
| rat | LD50 | intravenous | 35mg/kg (35mg/kg) | LUNGS, THORAX, OR RESPIRATION: ACUTE PULMONARY EDEMA | Bolletino della Societe Italiana di Biologia Sperimentale. Vol. 44, Pg. 1685, 1968. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Poison by intravenous route causing blood clotting. Questionable carcinogen with experimental tumorigenic data.
Risk Statements: 20/22-8
R20/22:Harmful by inhalation and if swallowed.
R8 :Contact with combustible material may cause fire.
Safety Statements: 22-24/25
S22:Do not breathe dust.
S24/25:Avoid contact with skin and eyes.
WGK Germany: 3
RTECS of Bentonite (CAS NO.1302-78-9): CT9450000
Specification
Bentonite (CAS NO.1302-78-9), its Synonyms are Accugel F ; Akajo ; Albagel Premium USP 4444 ; Altonit SF ; Aquagel ; Aquagel Gold Seal ; Bentonite magma ; Bentonite, calcian-sodian ; Detercal G 2FC ; Detercol P 2 ; Panther creek bentonite ; Southern bentonite . It is gel, or solid if dry.
