When a hydraulic line bursts on a factory floor, or a diesel drum leaks in a warehouse, or oil surfaces in a petrol station drainage sump — the response material poured onto that spill is likely bentonite absorbent granules. These 1–5 mm calcined clay granules are the industrial world's first line of defence against liquid spills, absorbing up to 5 times their own weight in oil, solvents, and aqueous chemicals.
Our absorbent granules are produced from calcined (heat-treated) bentonite at our Bhavnagar facility. The calcination step — heating the clay to 400–600°C in a rotary kiln — is what creates the high-porosity internal structure that drives absorption. Uncalcined bentonite absorbs 200–300% of its weight; calcined absorbent reaches 400–500% — a meaningful difference when you are pouring material onto a 200-litre oil spill.
Industrial absorbent is a specification-driven product. Buyers test for absorption capacity (oil and water), dust level (excessive dust creates a secondary hazard during application), and non-toxicity (the spent absorbent must be disposable as non-hazardous waste). Our absorbent granules meet all three requirements and are supplied to industrial maintenance distributors across India and to export buyers in the Middle East and Africa.
Technical Specifications
Factory-Direct Pricing
15–30% lower than marketplace rates. No middlemen.
How Calcination Creates Absorption Capacity
Raw bentonite absorbs liquid primarily through interlayer swelling — water or oil molecules enter the space between clay platelets, causing the clay to expand. This mechanism provides 200–300% absorption. Calcination at 400–600°C drives off structural hydroxyl groups from the clay mineral lattice, creating microscopic voids throughout the granule. These voids — not present in raw clay — provide additional absorption capacity through capillary action, pushing total absorption to 400–500% of the granule's own weight.
The calcination temperature is critical: too low and the pore structure does not develop; too high (above 700°C) and the clay begins to sinter, collapsing the pores and reducing absorption below even raw bentonite levels. Our kiln operators maintain the 400–600°C window through continuous temperature monitoring and adjust feed rate to ensure every granule receives adequate heat exposure.
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View full categoryFrequently Asked Questions
How do I dispose of spent absorbent granules after use?
Spent absorbent should be disposed of according to the nature of the liquid absorbed. Bentonite granules that absorbed oil or fuel are classified as hazardous waste and should be disposed through an authorised hazardous waste handler. Granules that absorbed water-based or non-toxic liquids can be disposed as general industrial waste. We provide disposal guidance documentation with bulk orders.
What is the coverage area per 25 kg bag?
For a typical oil spill on a concrete floor, one 25 kg bag covers approximately 5–8 square metres at a thickness sufficient for absorption. For preventive application (sprinkling around machinery), coverage is 15–20 square metres per bag. Actual coverage depends on spill volume and surface porosity.
Can absorbent granules be used for chemical spills?
Bentonite absorbent is effective for most organic liquids (oils, fuels, solvents) and aqueous solutions. It is NOT suitable for strong acids (sulphuric, nitric, hydrochloric) or strong oxidisers, which can react with the clay mineral structure. For chemical-specific absorbent recommendations, share the chemical name and concentration during enquiry.