The form your mill needs.
The quality your product needs.

Lumps, crushed material and fines

Lumps are larger pieces of raw material. Crushed talc and fines are smaller fractions produced or separated during extraction, handling and preparation. Product descriptions should state the actual size requirement agreed for the order.

Raw fines are not automatically micronized powder. A powder specification normally needs a defined particle-size distribution and an agreed measurement method.

Compare by process requirement

Availability and processing status must be confirmed for the selected offering. Raw-material supply should not be confused with future micronizing capacity.

Smaller does not mean lower grade

Size describes the material form. Grade describes the agreed quality selection. Neither lumps nor fines should be accepted or rejected on size alone.

Compare representative samples for mineral composition, optical properties, moisture and other agreed parameters. A selected lump and a composite of fines are different sample types; record that difference when comparing results.

Think about the mill and material handling

Tell us the feed size your mill accepts and how the material is received, stored and fed. Discuss moisture and the proportion of smaller particles where these affect flow or handling.

Trial the proposed material under your own processing conditions before making a wider performance assumption.

Define the order clearly

A useful enquiry names the origin, grade, material form, size requirement, test methods, quantity and destination. Keep packaging and sample requirements in the same discussion.