Talc

Molecule structure of Talc (CAS NO.14807-96-6):

IUPAC Name: Trimagnesium; dioxido(oxo)silane; hydroxy-oxido-oxosilane 
Molecular Weight: 379.26568 g/mol
Molecular Formula: H₂Mg₃O₁₂Si₄ 
Density: 2.7-2.8 g/cm³
Melting Point: 800 °C
H-Bond Donor: 2
H-Bond Acceptor: 12
Exact Mass: 377.817457
MonoIsotopic Mass: 377.817457
Topological Polar Surface Area: 247
Heavy Atom Count: 19
Canonical SMILES: O[Si](=O)[O-].O[Si](=O)[O-].[O-][Si](=O)[O-].[O-][Si](=O)[O-].[Mg+2].[Mg+2].[Mg+2]
InChI: InChI=1S/3Mg.2HO3Si.2O3Si/c;;;4*1-4(2)3/h;;;2*1H;;/q3*+2;2*-1;2*-2
InChIKey: KNXVOGGZOFOROK-UHFFFAOYSA-N
EINECS: 238-877-9
Product Categories: Inorganics

 Talc (CAS NO.14807-96-6) is an important industrial mineral, widely used in ceramic, paint, textile, linoleum, paper making, rubber, coating, daily chemical products. Its resistance to heat, electricity and acids make it an ideal surface for lab counter tops and electrical switchboards. It is also an important filler material for paints, rubber and insecticides. Talc is used as a cosmetic, for lubricants, and as a filler in paper manufacturing. Most tailor's chalk consists of talc.

 Talc (CAS NO.14807-96-6) 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

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.

Hazard Codes: Xn
Risk Statements: 20-37 
R20: Harmful by inhalation. 
R37: Irritating to respiratory system
Safety Statements: 36 
S36: Wear suitable protective clothing.
RTECS: WW2710000

ACGIH TLV: Human Carcinogen; TWA >2 mg/m³, Respirable Dust

 Talc (CAS NO.14807-96-6) is also named as Agalite ; Alpine talc USP, bc 127 ; Asbestine ; B 13 ; B 13 (mineral) ; B 9 ; Beaver White 200 ; CCRIS 3656 ; CI 77718 ; CP 10-40 ; CP 38-33 ; Crystalite CRS 6002 ; Desertalc 57 ; EX-IT ; Emtal 500 ; Emtal 549 ; Emtal 596 ; Emtal 599 ; FW-XO ; Fibrene C 400 ; Finntalc C10 ; Finntalc M05 ; Finntalc M15 ; Finntalc P40 ; Finntalc PF ; French chalk ; HSDB 830 ; Hydrous magnesium silicate ; IT Extra ; LMR 100 ; Lo Micron talc USP, bc 2755 ; MP 12-50 ; Magnesium silicate talc ; Magnesium silicate, hydrous ; Micro Ace K1 ; Micro Ace L1 ; Micron White 5000A ; Mistron Star ; Mistron frost P ; Mistron super frost ; PK-C ; PK-N ; Talcan PK-P ; Talcron CP 44-31 ; Talcum ; UNII-7SEV7J4R1U . Talc (CAS NO.14807-96-6) is white to almost white micro fine powder. It is readily adheres to the skin. It is nonflammable, noncombustible, and nontoxic. Talc is insoluble in water. It has low reactivity.