Quality Control in Potash Feldspar Export

Industrial minerals are not commodities — they are specification products. The same mineral can range from a low-value agricultural grade to a high-value pharmaceutical grade depending on processing and purity. Particle size is the most critical specification for most applications. It is expressed in microns (µm) and characterised by D50 (median diameter), D97 (97% of particles below this size), and sometimes D90. Mesh size is an older unit still used in India: 300 mesh = app

Evaluating an industrial mineral supplier requires looking beyond the price per tonne. For B2B buyers, the following framework covers the most critical due diligence points. Mine ownership is the first question. A supplier who owns the mine has direct control over raw material quality, supply continuity, and pricing. Traders who aggregate from multiple small mines may offer price flexibility but carry supply consistency risks. For long-term supply relationships, mine ownershi

Qualifying a new feldspar supplier requires a systematic process. The following steps ensure you are dealing with a reliable partner capable of consistent quality and supply. First, verify mine ownership. Feldspar processors who own their mines have better control over raw material variability. Ask for mine lease documentation and a quarry map showing the working faces. Second, inspect processing facilities. Visit the plant and assess: crushing and grinding equipment, classif