Premium Swelling Clay

Bentonite Clay

Al2O3·4SiO2·H2O

The remarkable swelling clay with exceptional absorption, binding, and sealing properties — essential for foundry, drilling, and civil engineering.

High Swell
24+ ml/2g
Natural
ISO Certified
Request Quote View Grades
18+Grades
10+Industries
40+Countries
30+Years
Bentonite - 20 Microns
Scroll to Explore
Product Overview

About Bentonite

Understanding the fundamentals of bentonite

Product Overview

The Versatile Swelling Clay

Bentonite is a montmorillonite-rich clay with extraordinary swelling capacity, formed from volcanic ash weathering. Available in sodium and calcium varieties.

Its unique properties — high swelling index, excellent binding strength, and thixotropic behavior — make it indispensable in foundry, drilling fluids, civil engineering, and environmental applications.

Wyoming Type Indian Type Calcium Based
Al2O3·4SiO2·H2O

Chemical Formula

Bentonite

Chemical Properties
  • Montmorillonite70-85%
  • SiO2 Content55-65%
  • Al2O3 Content15-22%
  • pH Value8.5 – 10.5
Physical Properties
  • Swell Index24+ ml/2g
  • Liquid Limit300-500%
  • Specific Gravity2.5 – 2.8
  • Moisture8 – 12%
24+
Swell Index
85%+
Montmorillonite
Na/Ca
Types
ISO
Certified

Natural & Sustainable

Naturally occurring clay with eco-friendly properties.

NaturalBiodegradableEco-Safe
Bentonite clay deposits - natural source
Natural Source

From Volcanic Origins
to Industrial Excellence

Mined from premium deposits and processed for consistent swelling, binding, and sealing performance.

500M+Tons Global Reserve
30+Years Processing
6+Mining Sites
High swelling
Strong binding
Thixotropic
Multi-purpose
Consistent quality
Advantages

Key Benefits

Why bentonite is the preferred choice for industry leaders worldwide

01

Exceptional Swelling

Absorbs water and swells to many times its dry volume, providing excellent sealing properties.

02

Strong Binding

Excellent green and dry strength for foundry molding sand applications.

03

Thixotropic Behavior

Gels at rest and flows under shear, ideal for drilling fluids and suspensions.

Bentonite
24+Swell Index
6Key Benefits
10+Industries
04

Adsorption Capacity

High surface area for waste treatment, oil purification, and environmental applications.

05

Impermeability

Creates water-tight barriers for landfill liners and pond sealing.

06

Cost Effective

Economical binder and additive reducing overall processing costs.

Industrial manufacturing excellence
World Class Quality

Industry-Leading Performance
at Every Scale

Trusted by leading manufacturers across 50+ countries for consistent, high-purity bentonite that meets international standards.

ISO 9001 EcoVadis Gold REACH Compliant Lab Certified
ISO Certified
Global Supply
Lab Tested
Industry Leading
Product Range

Available Grades

Comprehensive range of bentonite grades for diverse industrial applications

Precision quality testing of bentonite grades

Precision Engineered Grades

Every grade is meticulously tested in our state-of-the-art laboratories to meet the most demanding industrial specifications worldwide.

Swell Index24+
Montmorillonite85%+
TypesNa/Ca
CertifiedISO
Most Popular
Foundry

Foundry Grade

High Binding

Premium bentonite for green sand molding with excellent binding strength and durability.

  • High green strength
  • Durability
  • Hot strength
Learn More
Drilling

Drilling Grade

API Spec

API-compliant bentonite for drilling fluids with superior viscosity and filtration control.

  • API compliant
  • High yield
  • Low filtrate
Learn More
Civil

Civil Engineering Grade

Sealing

High-swelling bentonite for diaphragm walls, tunneling, and waterproofing applications.

  • High swell
  • Impermeability
  • Stability
Learn More
Pet

Cat Litter Grade

Clumping

Superior clumping bentonite for premium cat litter with excellent odor control.

  • Fast clumping
  • Odor control
  • Dust free
Learn More
Product Statistics
4Grade Categories
18+Product Variants
Na/CaTypes Available
Request Custom Grade
ISO 9001 Certified Global Delivery Technical Support Custom Solutions
Applications

Industries & Applications

Versatile applications across diverse industry verticals worldwide

Foundry Industry

Foundry Industry

Green sand binder for iron, steel, and non-ferrous casting with excellent moldability.

Iron CastingSteelNon-Ferrous
8%Addition Rate
Oil & Gas Drilling

Oil & Gas Drilling

Drilling fluid additive for viscosity, filtration control, and wellbore stability.

Drilling MudViscosifierFiltration
APICertified
Civil Engineering

Civil Engineering

Slurry walls, tunneling, waterproofing, and geotechnical applications.

TunnelingWaterproofingDiaphragm
HighSwell Index
Environmental

Environmental

Landfill liner, contamination barrier, and waste water treatment.

LandfillTreatmentBarriers
LowPermeability
Pet Care

Pet Care

Premium clumping cat litter with superior absorption and odor control.

Cat LitterClumpingOdor Free
FastClumping
Pharmaceuticals

Pharmaceuticals

Active ingredient carrier and excipient in pharmaceutical formulations.

CarrierExcipientBinder
USPGrade
10+Industries
18+Applications
40+Countries
600+Customers

Need a Custom Solution?

Our experts help you find the perfect grade

Get Expert Advice
Our Promise

Why Choose 20 Microns?

World-class quality minerals backed by decades of expertise & innovation

20 Microns state-of-the-art manufacturing facility

Years of
Excellence

ISO 9001
High Swell
Premium
Certified

Our bentonite is sourced from premium deposits and processed to deliver consistent swelling index, binding strength, and performance across all applications.

Premium Deposits

Finest quality clay deposits

Advanced Processing

State-of-the-art activation

Consistent Quality

Batch-to-batch reliability

Technical Support

Expert application assistance

Start Your Journey With Us
Key Metrics
6+Processing Plants
40+Countries Served
600+Happy Customers
30+Years Experience
EcoVadis Gold Sustainability Rating
24+Swell Index
R&DInnovation
24/7Logistics
ExpertSupport
Knowledge Base

Frequently Asked Questions

Get answers to common questions about Bentonite

Knowledge Center

Find detailed answers about specifications, applications, and technical details.

4Questions
24/7Support
TechnicalApplicationsGradesQuality

Still Have Questions?

Our team is here to help

Contact Us
01

What is bentonite used for?

Bentonite is widely used in foundry sand binding, drilling fluids, civil engineering, waterproofing, and cat litter due to its swelling and binding properties.

Foundry Drilling Civil
02

What is the difference between sodium and calcium bentonite?

Sodium bentonite has higher swelling capacity (24+ ml/2g) ideal for drilling and sealing. Calcium bentonite has lower swelling but better for bleaching and foundry.

Sodium Calcium Activated
03

What is swell index?

Swell index measures the volume of swelling in water (ml/2g bentonite). Higher swell index indicates better sealing and viscosity properties. Premium grades exceed 24 ml/2g.

Volume Quality Performance
04

Is bentonite safe for the environment?

Yes, bentonite is a naturally occurring, non-toxic clay widely used in environmental applications like landfill liners and contamination barriers.

Natural Non-Toxic Eco-Safe

Still have questions?

Our technical experts are available to provide detailed answers

Send Inquiry Email Us
Industry Applications

Product Applications

Bentonite serves as a critical input across diverse industrial sectors worldwide

01

Foundry

Green sand binder for metal casting.

02

Drilling

Drilling fluid viscosifier.

03

Civil Engineering

Slurry walls and waterproofing.

04

Environmental

Landfill liners and barriers.

05

Pet Care

Clumping cat litter.

06

Pharmaceuticals

Excipient and carrier.

07

Wine & Beverages

Clarification and fining.

08

Agriculture

Soil amendment and carrier.

09

Cosmetics

Face masks and treatments.

10

Paints

Rheology modifier.

10+Application Sectors
18+Product Grades
40+Countries Served
600+Industry Clients
Bentonite industrial applications worldwide
Global Industrial Reach

Powering Industries Across
50+ Countries

From cosmetics to oil & gas — bentonite is the essential mineral behind thousands of products you use every day.

Need a Specific Grade for Your Application?

Our experts will guide you to the perfect bentonite solution

Request Expert Consultation
Product Video

See It In Action

Watch how 20 Microns' Bentonite powers real-world industrial applications

Bentonite in Action – 20 Microns
YouTube
Official Product Film

Bentonite - The Versatile Clay

20 Microns Limited · Official Channel

About This Video

Discover how 20 Microns' Bentonite grades deliver superior performance across industrial applications.

  • Product manufacturing overview
  • Quality control processes
  • Application demonstrations
  • Global supply capabilities
Watch on YouTube

Let's Get in Touch & Explore Business Opportunities

Partner with India's leading producer of industrial minerals

Connect With Us Email Us
Quick Inquiry

Bentonite

Premium Swelling Clay

Fill out the form and our technical experts will get back to you with customized solutions tailored to your industry.

Quick Response
Expert Advice
Free Samples
Global Shipping
enquiry@20microns.com +91 2668 263125
Secure Private Verified

Request Information

Fill in your details below

Average response time: 4 hours