Sourcing Industrial Minerals from India: A Buyer's Checklist

Why a checklist helps

Sourcing industrial minerals from India is common for buyers of bentonite, attapulgite, bleaching earth, dolomite, calcium carbonate and similar materials, because the country has substantial mineral deposits and an established processing base. As with any international supply, the outcome depends on how clearly the purchase is defined at the start.

This checklist sets out the steps that experienced procurement and QC teams follow, from writing a specification to checking the first delivery. It applies whether you are buying a few tonnes for a trial or setting up a long-term supply contract.

Start with a written specification

Many supply problems trace back to an incomplete specification. Before requesting quotations, write down what the material must do and how it will be tested.

• Product and grade, including any industry standard that applies, such as API 13A for drilling clays.
• Critical properties with limits, for example moisture, particle size or residue on a stated sieve, whiteness, swelling index, surface area or chemical composition.
• The test method for each property, such as ASTM, IS, AOCS or an agreed internal method, so that both sides measure in the same way.
• Acceptance criteria that separate guaranteed limits from typical values given for information.
• The end use, so that the supplier can point out a more suitable grade.
• Expected annual volume and order frequency.

Samples and trials

Request a representative sample before the first order and test it in your own laboratory or process. Ask whether the sample comes from current production and which batch it represents. A sample prepared specially for evaluation tells you less than one drawn from a normal production lot.

For process-critical materials, plan a staged approach: laboratory evaluation, then a plant trial with a small quantity, then a first commercial order. Keep part of each approved sample as a reference, so that later deliveries can be compared against the material you accepted.

Quality documents to request

Documentation is how you confirm that each delivery matches the approved material. The table lists the core documents and what to look for in each.

Check that the batch number on the CoA matches the markings on the packaging. For regulated end uses such as food contact, feed or pharmaceuticals, confirm which regulatory documents your market requires and verify that the supplier can provide them before ordering.

Packaging, labelling and loading

Industrial minerals are usually supplied in bags or bulk bags, and the right choice depends on your handling equipment, storage and climate.

• Bags of 25 kg or 50 kg, in HDPE or paper, suit manual addition and smaller sites. Ask about inner liners for moisture-sensitive materials.
• Jumbo bags (FIBCs), typically 1 MT or 1.2 MT, suit silo filling and mechanised handling. Confirm the lifting loops, discharge spout and safe working load.
• Palletising and stretch-wrapping reduce damage and moisture pickup in transit. Where wooden pallets are used, check whether the importing country requires heat-treated, marked pallets under ISPM 15.
• Bag markings should show product name, grade, batch number, net weight and any required hazard labels. Agree private-label or neutral packaging in writing.
• Agree the loading plan in advance. Dense minerals often reach a container's weight limit before its volume is full.

Incoterms and trade documentation

Incoterms are the International Chamber of Commerce rules that define where cost and risk pass from seller to buyer. State the rule, the edition, for example Incoterms 2020, and the named place in the contract. In general terms:

Typical shipping documents include a commercial invoice, packing list, bill of lading or air waybill, certificate of origin, CoA and SDS. Depending on the destination, an insurance certificate, a fumigation or phytosanitary certificate, or other import documents may also be needed. Agree the full list, and any wording required by your customs broker or bank, before the goods are shipped.

• EXW and FCA: the buyer takes over at the seller's premises or an agreed handover point and arranges most of the transport.
• FOB: for sea freight, the seller delivers the goods on board the vessel at the named port of shipment, and the buyer arranges the main carriage.
• CFR and CIF: the seller pays the main sea freight to the named destination, and under CIF also arranges minimum insurance, but risk passes to the buyer once the goods are on board at origin.
• DAP and DDP: the seller delivers to a named place at destination; under DDP the seller also handles import clearance and duties.

Quality checks before and after shipment

A consistent inspection routine protects both buyer and supplier. For long-term contracts, a supplier audit, in person or remote, adds further confidence by showing raw material sourcing, processing, laboratory testing and packing in practice.

• Before shipment: request the CoA for the lot to be shipped and, for larger orders, consider independent pre-shipment inspection with sampling and testing.
• On arrival: inspect packaging for damage or wetting, check bag counts and markings, and draw samples according to an agreed sampling plan.
• Testing: check critical parameters against the specification, using the same methods as the supplier, and compare results with the CoA and your retained reference sample.
• Feedback: share results with the supplier promptly, including any deviations, so that corrective action can be agreed.
• Ongoing review: track results across lots to monitor consistency, and revisit the specification as your process changes.

How Obsidian Minerals can help

Obsidian Minerals is a manufacturer and exporter of industrial minerals and specialty chemicals, with its factory at Kardej Village, Aaryanagar, Bhavnagar, Gujarat, and its corporate office in Bhavnagar. The company operates 5+ manufacturing sites with 25,000+ MTPA capacity and exports to 15+ countries.

Processes are ISO 9001 certified, and testing is carried out in an NABL-accredited laboratory. MSDS/SDS, a Technical Data Sheet and a batch Certificate of Analysis are supplied with shipments. Packaging is available in 25 kg or 50 kg HDPE or paper bags and 1 MT or 1.2 MT jumbo (FIBC) bags, with custom or private-label packaging on request. Samples are available on request, and custom grades and particle sizes can be developed with customers.

Frequently asked questions