Product
Bentonite
Bentonite is a swelling sodium montmorillonite clay used to build viscosity and control fluid loss in drilling mud, and in piling, foundry and pelletising work.
- Grades / forms
- API drilling grade
- Documents
- TDS to view and download
Overview
Sodium bentonite is a clay made of thin platelets of montmorillonite that absorb water and swell many times their dry volume. In drilling fluid those platelets build viscosity to carry cuttings to surface, and they form a thin, low-permeability filter cake on the well wall that stops mud being lost into the formation.
Drilling-grade bentonite is tested to API 13A for viscosity yield, filtrate volume and grit. The same swelling behaviour makes bentonite essential in horizontal directional drilling, diaphragm walls and piling, as a binder in foundry sand and iron ore pellets, and in waterproofing liners. Calcium bentonites can be soda-activated to approach sodium bentonite performance.
Applications
- 1Viscosifier and fluid-loss control in drilling mud
- 2Horizontal directional drilling and water well drilling
- 3Support fluid for piling and diaphragm walls
- 4Binder in foundry green sand
- 5Binder in iron ore pelletising
- 6Geosynthetic clay liners and waterproofing
Specification
- Moisture Content
- Max 12%
- pH (5% slurry)
- 8.5 - 10.5
- Particle Size
- 95% passing 200 mesh
- Swelling Capacity
- Min 20 ml/2g
- Bulk Density
- 0.8 - 1.1 g/cm³
- Montmorillonite Content
- Min 70%
- Ash Content
- Max 15%
- Silica (SiO₂)
- 55 - 65%
- Alumina (Al₂O₃)
- 15 - 25%
- Iron Oxide (Fe₂O₃)
- Max 8%
- Calcium Oxide (CaO)
- Max 5%
Specification as stated on our Technical Data Sheet, which you can download below.
Documents
PDF documents from our quality records.
Packing & storage
Packing
- 25 kg & 50 kg bags
- 1–1.5 tonne jumbo bags
Storage & handling
Keep dry. Bentonite absorbs moisture from the air and will cake; pallets should be covered and stored off the ground.
Enquire
Get a price for Bentonite
Send grade, quantity and destination port. Price, lead time and documents come back within one business day.
Request a quotation or call +91 97979 77958- Certificate of Analysis with every batch
- SDS in destination format
- Made to your specification
- Private label packing
Questions
Bentonite, answered.
Sodium bentonite swells strongly in fresh water and builds high viscosity and a tight filter cake, which is why drilling and piling use it. Calcium bentonite swells much less; it can be treated with soda ash ('activated') to improve swelling, and is widely used in foundries and as an absorbent.
Bentonite should be pre-hydrated in fresh water for several hours before salt, lime or other electrolytes are added. Mixed straight into salty or hard water, the platelets cannot swell properly and the yield drops sharply.
Yes. Drilling-grade bentonite is tested for viscometer dial reading, yield point to plastic viscosity ratio, filtrate volume, residue above 75 µm and moisture as set out in API Specification 13A.
Yes. Cosmo Chemistry manufactures and exports Bentonite from Surat, Gujarat, India to more than 55 countries, for customers in the mining & oil drilling industry. Send your grade, quantity and destination port for a quotation within one business day.
Every shipment of Bentonite from Cosmo Chemistry includes a batch-specific Certificate of Analysis (COA) and Safety Data Sheet (SDS). Certificate of Origin, third-party pre-shipment inspection and destination-specific regulatory documentation are arranged on request.
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