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Bentonite

Bentonite

CAS Number: 1302-78-9

Molecular Formula: Al2H2O12Si4

Ex(Al₂₋ₓMgₓ)SiO₁₀(OH)₂

About Bentonite

Bentonite is one of the most universally used and versatile industrial minerals in the world. AN bsorbent clay rock composed primarily of the mineral montmorillonite abd characterized by its high swelling capacity, strong adsorption, and exceptional viscosity. The global bentonite market is experiencing robust structur...

Bentonite Specifications

CAS Number
1302-78-9
Molecular Formula
Al2H2O12Si4
IUPAC Name
dialuminum;tetrakis(dioxosilane);tris(oxygen(2-));hydrate
Canonical SMILES
O.[O-2].[O-2].[O-2].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.[Al+3].[Al+3]
InChI Key
GUJOJGAPFQRJSV-UHFFFAOYSA-N
InChI
1S/2Al.4O2Si.H2O.3O/c;;4*1-3-2;;;;/h;;;;;;1H2;;;/q2*+3;;;;;;3*-2
PubChem CID
71586775
Volumetric Swelling
Expands 15 to 20 times its dry volume when hydrated. This occurs as water molecules force apart the parallel silicate layers.
Thixotropic Gelation
Exhibits time-dependent shear-thinning. At rest, it forms a rigid, high-viscosity gel due to electrostatic attraction between particle edges and faces. Under mechanical shear or agitation, this structure breaks down, causing viscosity to drop instantly.
Plasticity Index
Exceptionally high plasticity index, often ranging between 300% and 600%. It requires immense amounts of water to transition from a plastic solid state to a liquid state (liquid limit).
Specific Gravity
True specific gravity ranging from 2.4 to 2.8, though its bulk density varies heavily based on moisture content and compaction.
Microscopic Particle Size
Individual crystallites are ultra-fine flakes, with thicknesses of approximately 1 nm and lateral dimensions under 2 μm.
Cation Exchange Capacity (CEC)
High CEC, typically measuring between 80 meq/100 g and 150 meq/100 g. Isomorphous substitution within the atomic lattice (e.g., Mg²⁺ replacing Al³⁺) leaves a permanent negative net charge that attracts exchangeable cations.
Specific Surface Area
Total surface area ranges from 600 m²/g to 800 m²/g. Over 80% of this area is internal, located within the expandable interlayer spaces.
GHS Hazard Statements
H315 (31.8%): Causes skin irritation H319 (32.1%): Serious eye damage/eye irritation H335 (31.8%): May cause respiratory irritation

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A key bonding material mixed with moulding sand to enhance strength and thermal stability for producing iron, steel, and non-ferrous castings

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Bentonite FAQs

Minimum Order Quantity

25 kg (pilot) · 1 MT (commercial)

Lead Time

3 – 5 weeks ex-works

Incoterms

FOB · CIF

Packaging

20 L pails, 200 L HDPE drums, 1000 L IBC

Regional Availability

India · EU · Middle East · Southeast Asia

Documentation

SDS · COA · TDS available on request

Compliance & Quality

REACH registered*

GHS/SDS available

ISO 9001:2015 site*

RoHS compliant*

Global sourcing network

Consistent quality & reliability

End-to-end technical support

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