Thermal orthophosphoric acid 73 %
High-purity thermal orthophosphoric acid for the food and chemical industries and fertiliser production, in ISO tanks, rail tank cars and IBCs.
H₃PO₄ 73 % min, GOST 10678-2019, Grades A and B
Product
Thermal orthophosphoric acid to GOST 10678-2019 with an H₃PO₄ content of not less than 73 %. Grade A has low impurity limits, including arsenic, fluorine, cadmium and mercury; Grade B, 1st grade, is supplied at 73 % or at 78–80 % on request. Measured values for each lot are given on the producer’s Certificate of Analysis.
Applications
Phosphates and detergents, metal treatment and phosphating, water treatment, chemical synthesis and fertiliser production (Grade B).
Supply and logistics
In 316L stainless ISO tank containers (T14, about 30 t net per 20-ft tank), rail tank cars and IBCs, on FCA, FOB, CFR, CIF or DAP terms. Freezing point −17 °C, so no heating is required in transit. Orthophosphoric acid is a class 8 corrosive substance (UN 1805, PG III) and not a marine pollutant. Shelf life 6 months from the date of manufacture in closed acid-resistant containers.
Documents
Producer’s Certificate of Analysis for every lot, Al Raas product specification, Safety Data Sheet on request.
Specification
Thermal orthophosphoric acid 73 %, GOST 10678-2019
| Parameter | Grade A | Grade B, 1st grade |
|---|---|---|
| Appearance | Colourless, transparent liquid (15–20 mm layer) | Colourless or faint yellow tint |
| Orthophosphoric acid (H₃PO₄), % min | 73 | 73 (78–80 on request) |
| Chlorides, % max | 0.005 | 0.01 |
| Sulphates, % max | 0.010 | 0.015 |
| Nitrates, % max | 0.0003 | 0.0005 |
| Iron (Fe), % max | 0.002 | 0.010 |
| Heavy metals of the H₂S group (as Pb), % max | 0.0005 | 0.002 |
| Arsenic (As), % max | 0.0003 | 0.006 |
| Reducing substances (as H₃PO₃), % max | 0.1 | 0.2 |
| Metaphosphoric acid (HPO₃) | Passes test | Passes test |
| Suspended particles | Passes test | Passes test |
| Yellow phosphorus (P₄) | Passes test | Not standardised |
| Fluorine (F), % max | 0.001 | Not standardised |
| Cadmium (Cd), % max | 0.0001 | Not standardised |
| Mercury (Hg), % max | 0.0001 | Not standardised |
Values per the producer’s technical specification; measured values for each lot are given on the Certificate of Analysis accompanying the shipment. For Grade B used in fertiliser production, chlorides, sulphates, nitrates, iron, heavy metals, arsenic, reducing substances, HPO₃ and suspended particles are not determined. Test methods per GOST 10678-2019.
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