How Can Produce Or Buy Aluminium Orthophosphate Dihydrate ?

Go here: Search GlobalSpec type in name of chemical.

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It is also used as a white pigment in paints. If you contact a chemical supply house, they may have a pharmaceutical grade.

You haven't told us what grade you need. It has a variety of uses as a white pigment in paint, dental cement, ceramics, concrete, etc. It is also a hazardous material. Avoid skin contact and don't inhale the dust. If you need USP, Analytical Grade, or Technical Grade, contact a chemical supply house. If you need large quantities of lower grade material for an industrial process or a construction project, contact a dealer in building supplies, paints, concrete products, or whatever. Google is your friend. Use it.

You may find it useful to search using both the European spelling ("aluminium") and the American one ("aluminum"), and to search on "aluminum orthophosphate" (and aluminium ditto), since the dihydrate implies that two molecules of water are attached to each molecule of the primary chemical - you may even be able to add this yourself - but websites of suppliers will likely provide several variants.

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