Product Overview
Phosphoric Acid 75% USP Food Grade is a clear, colorless, odorless viscous liquid — orthophosphoric acid (H₃PO₄, CAS 7664-38-2) at 75% concentration in a food-grade specification. It is the workhorse acid for buyers who need acidity control in food and beverage processing, phosphorus chemistry in fertilizer blending, or rust and scale removal in maintenance cleaning, and who need food-grade documentation behind it. We stock it in our Taylor, TX warehouse and ship it daily, from single quarts for bench work up to 330-gallon totes for production lines.
Why This Concentration
At 75%, this product carries serious acid strength while pouring and metering more easily than the most concentrated grades. Phosphoric acid gets noticeably more viscous as concentration climbs; 75% stays fluid enough to pump and dose accurately at room temperature, which matters when you are feeding a pH-control loop or blending it into a formulation. It is still a corrosive liquid with the signal word Danger — it causes severe skin burns and eye damage and may be corrosive to metals (per the product's GHS classification) — so treat it with the same respect you would give any strong acid.
Pick this concentration when you want fewer dilution steps than a weaker solution requires, but easier handling than a more concentrated acid demands. The Food Grade designation matters when your process touches food, beverage, or similar regulated formulations; if your application is strictly industrial — say, rust removal on shop equipment — a technical grade may serve at lower cost, and this page's grade is the right call only when food-grade quality is a requirement, not a preference.
Chemical Profile
This is a clear, colorless viscous liquid with no odor. The formula is H₃PO₄ with a molecular weight of 97.995, registered under CAS 7664-38-2. Density of the 75% solution runs approximately 1.575 at 25 °C — noticeably heavier than water, which you feel the moment you lift a full gallon jug. It is miscible with water, so dilution to working strength is straightforward: it blends completely without layering or settling. Vapor pressure is low, meaning it does not fume aggressively at ambient temperature the way volatile mineral acids do, though ventilation in storage and handling areas is still standard practice.
Industrial Applications
Phosphoric acid at this strength and grade shows up across several industries:
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pH adjustment in food processing — dosed to bring product and process water acidity to target, supporting flavor development and preservation chemistry in formulations.
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Beverage acidulation — the classic acidulant behind the tart bite in soft drinks and other beverages, metered into syrup and blending operations.
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Fertilizer and agriculture — a phosphorus source for liquid fertilizer blending, supplying one of the three primary plant nutrients.
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Rust and scale removal — converts iron oxide and dissolves mineral deposits in industrial cleaning formulations, which is why it anchors many metal-prep and descaling products.
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Pharmaceutical buffering — used in formulation work to hold pH stable in buffered systems.
In every one of these, the acid is doing process chemistry — donating protons, supplying phosphate, converting oxides. Your own process qualification determines fit; the technical data sheet and lot documentation give you the specification data to run that qualification.
Handling & Storage
The signal word is Danger. This product causes severe skin burns and eye damage (H314) and may be corrosive to metals (H290) (per the product's GHS classification). Handle it accordingly: chemical-resistant gloves, splash goggles or a face shield, and clothing that covers exposed skin. Keep an eyewash accessible wherever it is dispensed.
Store it in HDPE or glass — the same materials we pack it in — away from incompatible materials, heat, and direct light. Because it can attack metals, do not transfer it into unlined steel containers or leave it in contact with metal fittings. It is stable in storage under those conditions; low vapor pressure means it is not pushing fumes into your storage area, but keep the space ventilated as a matter of course. Ground-level storage for larger containers saves your team from lifting a dense liquid overhead: a gallon of this product weighs roughly half again what a gallon of water does.
Hazmat & Shipping
This product ships as a regulated corrosive. The proper shipping name is PHOSPHORIC ACID SOLUTION (per 49 CFR 172.101), under UN1805 (per 49 CFR 172.101), Hazard Class 8 (per 49 CFR 172.101), Packing Group III (per 49 CFR 172.101). Every order leaves our dock in UN-spec packaging with correct marks, labels, and shipping papers. Our shipping and handling guidance is reviewed by Andre Taki, DOT Hazmat Specialist — this is what we do every day, and it is why carriers accept our freight without drama.
Documentation
A Safety Data Sheet ships with every order, available in English, Spanish, French, and Japanese. A lot-specific Certificate of Analysis is available for the material you receive, so your QC team can verify the actual lot against specification before it enters your process. A technical data sheet is also available for specification review before you buy.
Why Buy from Alliance Chemical
We are a chemical distributor and hazmat shipping operation, and this product moves through our Taylor, TX warehouse daily. Your order is packed by people who handle corrosives every shift: sealed HDPE containers, UN-spec cartons, correct Class 8 labeling, and complete shipping papers on every box, drum, and tote. We charge no hazmat fees. Quarts and gallons ship parcel; drums and totes ship freight on the same DOT-compliant footing. If you need help choosing between pack sizes or confirming documentation before a purchase order, you reach people who physically work with this material — not a call center.
