Two buyers ask for "dicalcium phosphate" and mean two different products. One needs a tablet excipient that passes a pharmacopoeia monograph; the other needs a food fortificant that meets the Food Chemicals Codex. The grade letters after the product name are not marketing, they are the contract, and getting them right saves a rejected shipment.
Two families of standards
Calcium phosphate specifications come from two different worlds. Pharmacopoeias, the Indian Pharmacopoeia (IP), British Pharmacopoeia (BP), European Pharmacopoeia (EP) and United States Pharmacopeia (USP), set standards for pharmaceutical-grade materials used in medicines. The Food Chemicals Codex (FCC), published by USP, is the internationally recognised standard for the identity, purity and quality of food ingredients.2 Same molecule, different rulebook, chosen by what the material is for.
What a monograph actually controls
A monograph is a testable specification, not a vague promise of quality. For dibasic (di) calcium phosphate the pharmacopoeial monograph pins down, among other things, the assay and the impurity ceilings.1
| Parameter | Typical pharmacopoeial limit |
|---|---|
| Assay (content) | 97.0% to 105.0% |
| Heavy metals | USP ≤0.003% (Method I); BP ≤40 ppm |
| Arsenic | ≤1 ppm |
| Lead | ≤0.25 ppm (EP/USP) |
| Fluoride | ≤50 ppm |
| Loss on ignition (anhydrous) | 6.6% to 8.5% |
| Loss on ignition (dihydrate) | 24.5% to 26.5% |
These numbers are why a pharmacopoeia grade costs more to make: hitting tight arsenic, lead and heavy-metal limits lot-after-lot takes process control and testing.
IP vs BP vs USP: mostly the same tune
Regional pharmacopoeias historically differed in method and limit, but calcium phosphate dibasic has been harmonised through the Pharmacopeial Discussion Group, aligning USP, EP and other pharmacopoeias on the core specification.3 In practice, IP is what Indian drug applications usually require, while BP and USP appear in export contracts. The safest approach is to state the exact pharmacopoeia your product is registered against and require the COA to reference that monograph by name.
FCC vs USP: food is not pharma
An FCC monograph covers identity, assay, impurities and other purity tests appropriate to a food ingredient, while a USP monograph does the same for a pharmaceutical ingredient.2 A material can be excellent food-grade and still not carry a pharmacopoeia claim, and vice versa. Do not accept an FCC certificate for a pharmaceutical excipient, or pay for USP purity when your application is a food fortificant.
Feed grade is a third thing
Feed-grade calcium phosphate follows animal-nutrition standards, where the defining control is a tight fluorine limit rather than pharmaceutical heavy-metal ceilings. It is a legitimate, purpose-built grade, just not interchangeable with food or pharma material.
Reading your COA against the grade
- Name the standard: the COA header should cite the exact monograph, for example "Dibasic Calcium Phosphate USP" or "Tricalcium Phosphate FCC."
- Match line by line: check assay and every impurity against the monograph limits, not just the ones you remember.
- Confirm the form: anhydrous and dihydrate have different loss-on-ignition ranges; the COA should say which you received.
- Keep it lot-specific: a generic specification sheet is not a Certificate of Analysis.
Need a specific grade with matching documentation?
We manufacture variety grades of DCP and TCP in Ratlam, India, and every single lot ships with complete documentation and full details; so you always know exactly what you're getting. We're happy to send samples for qualification.
Reach out anytime. We're glad to answer any questions.
Request a SampleSources and further reading
1. USP Monograph, Dibasic Calcium Phosphate (assay, heavy metals, loss on ignition). USP-NF monograph
2. U.S. Pharmacopeia, "Food Chemicals Codex (FCC) FAQs." usp.org
3. USP, "Calcium Phosphate Dibasic," Pharmacopeial Discussion Group harmonisation. usp.org harmonization