By physical separation rather than chemistry. Caking happens when moisture condenses at the contact points between particles and forms solid bridges as it dries. TCP is milled to a very fine particle size with a high specific surface area, so a small addition coats the host crystals, keeps them apart and adsorbs surface moisture before it can bridge them.
2
Why does particle size matter so much for TCP?
Because anticaking performance depends on surface area, not on mass. A finer powder coats more host surface per unit added, so less is needed to keep a product free-flowing. That is why anticaking grades are specified on particle size and surface area rather than only on assay, and why a coarser grade will underperform at the same dose.
3
Is TCP bioavailable despite being insoluble in water?
Yes. It dissolves readily in dilute acid, and the acidic conditions of the stomach release the calcium and phosphorus for absorption. That combination, insoluble in the product but soluble in the gut, is precisely why it works as a fortificant that contributes no taste, no chalky mouthfeel and no effect on pH or clarity.
4
Is commercial TCP the exact stoichiometric compound?
Usually not. Material sold as tricalcium phosphate is generally a calcium hydroxyapatite rather than exactly Ca3(PO4)2, which is normal for the commercial product and does not affect its function. The specification should state calcium and phosphorus content rather than relying on the nominal formula.
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Our team is ready to help with any specific enquiries about Tricalcium Phosphate (TCP).