Technical Grade vs Food Grade Phosphoric Acid: What Is the Difference?

Phosphoric acid 85% is sold in two main grades — technical and food — and buyers sometimes ask whether they are interchangeable. The base chemical is the same, but the grades are produced, tested and documented differently, and using the wrong one can create compliance problems. Here is the practical difference.

Purity and Impurity Limits

Both grades are typically 85% H₃PO₄. The difference is in the impurities: food grade phosphoric acid carries strict limits on arsenic, lead, fluoride and heavy metals, and controlled color and chloride levels. Technical grade focuses on the main content and process-relevant items, without food-level impurity control.

Standards and Documentation

Food grade is supplied against a food additive standard, with a COA covering the food-safety items, and is expected to be traceable. Technical grade is supplied against an industrial standard for applications such as water treatment, cleaning and metal surface treatment.

Applications

Food grade: beverages (especially cola), flavor adjustment, processed cheese, yeast and sugar processing — see what food grade phosphoric acid is used for. Technical grade: water treatment, descaling and cleaning formulations, fertilizer and industrial chemical production.

Price and Ordering

Food grade normally costs more because of purification and testing. Ordering the right grade starts with the end use: if the acid enters food or drink at any point, order food grade and confirm the standard and documentation before shipment. For background on market pricing, read why phosphoric acid prices are rising in 2026. Send us the grade, quantity and destination for a quotation.

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