Industry Insights
Understanding Particle Size Distribution (D50, D97) in Mineral Fillers
A practical explanation of D50 and D97 measurements and why they matter when specifying mineral fillers.
By Prime Carbonate Technical Team
·
June 24, 2026
Particle size distribution metrics like D50 and D97 describe the median and near-maximum particle sizes in a mineral powder, respectively. D50 indicates that 50% of particles are finer than the stated value, while D97 indicates 97% are finer.
These values matter because two products with the same average particle size can behave very differently in processing if their distribution curves differ — a wider distribution may include coarse particles that affect surface finish or dispersion.
When specifying a mineral filler, requesting both D50 and D97 values (not just an average) gives a clearer picture of expected processing behaviour.
These values matter because two products with the same average particle size can behave very differently in processing if their distribution curves differ — a wider distribution may include coarse particles that affect surface finish or dispersion.
When specifying a mineral filler, requesting both D50 and D97 values (not just an average) gives a clearer picture of expected processing behaviour.
Frequently Asked Questions
Common questions related to this topic.
Our standard minimum order quantity is one 20ft container load, though we can discuss smaller trial quantities for new partners depending on the product and destination.
We export to manufacturers across the Middle East, South Asia, Africa, and Southeast Asia. See our Export Countries section for a full list of current markets.
Yes. Many of our grades can be milled to custom particle size distributions and packed in bag sizes or bulk formats to match your production requirements. Contact us with your specification for a tailored quote.
Yes, every shipment is accompanied by a certificate of analysis confirming whiteness, particle size, moisture content, and purity for the batch shipped.
Typical lead time is 2-4 weeks from order confirmation to shipment, depending on quantity, grade, and current production schedule. We will confirm exact timelines at the quote stage.
We offer 25kg and 50kg PP woven bags, 1-ton jumbo bags, and bulk tanker loading for select products and destinations.
Our facility maintains ISO 9001 and ISO 14001 certification, and shipments can be inspected by third-party agencies such as SGS upon request.
Submit a request through our Request a Quote form specifying the product and your shipping address, and our team will arrange a sample dispatch.
We typically work with Letters of Credit (L/C) and Telegraphic Transfer (T/T) for international orders. Specific terms can be discussed based on order size and relationship history.
Yes, we work with many manufacturers on recurring supply schedules and can structure contract pricing and delivery plans for consistent long-term volumes.
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Learn more →Ready to Source This Grade for Your Production?
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