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ortho-Phosphoric acid 85%

for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Phosphoric acid, Orthophosphoric acid, o-Phosphoric acid, Orthophosphoric acid
Linear Formula:
CAS Number:
Molecular Weight:
MDL number:

Quality Level


ACS reagent


reag. ISO
reag. Ph. Eur.

vapor density

3.4 (vs air)

vapor pressure

2.2 mmHg ( 20 °C)
5 mmHg ( 25 °C)

product line





85% phosphoric acid


≤0.5 ppm As (Arsenic)
≤0.5 ppm Cd (Cadmium)
≤0.5 ppm Co (Cobalt)
≤0.5 ppm Cu (Copper)
≤0.5 ppm Mn (Manganese)
≤0.5 ppm Pb (Lead)
≤1 ppm Fluoride (F)
≤1.0 ppm Ni (Nickel)
≤10 ppm Fe (Iron)
≤10 ppm Heavy metals (as Pb)
≤10 ppm Insoluble matter
≤10 ppm Substances reducing potassium permanganate (as O)
≤10 ppm Volatile acids (as Acetic acid)
≤2 ppm Chloride (Cl)
≤2 ppm Zn (Zinc)
≤20 ppm Ca (Calcium)
≤20 ppm Phosphite and Hypophosphite (as H3PO3)
≤20 ppm Sulfate (SO4)
≤200 ppm Na (Sodium)
≤3 ppm Nitrate (NO3)
≤5 ppm K (Potassium)
≤5 ppm Mg (Magnesium)
≤5 ppm Sb (Antimony)


APHA: ≤10


<0.5 (20 °C, 100 g/L in H2O)

kinematic viscosity

30.5 cSt(20 °C)


158 °C (lit.)


~40 °C (lit.)


1.685 g/mL at 25 °C (lit.)

storage temp.

no temp limit

SMILES string




InChI key


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General description

for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Other Notes

Concentrated phosphoric acid is approx. 85% H3PO4 (aqueous).

Analysis Note

Assay (alkalimetric)≥ 85.0 %Identitypasses testAppearance of solutionpasses testColor≤ 10 HazenChloride (Cl)≤ 2 ppmFluoride (F)≤ 1 ppmNitrate (NO₃)≤ 3 ppmPhosphite and Hypophosphite (as H₃PO₃)≤ 20 ppmHypophosphite, phosphitepasses testHeavy metals (as Pb)≤ 10 ppmSulfate (SO₄)≤ 20 ppmAs (Arsenic)≤ 0.5 ppmCa (Calcium)≤ 20 ppmCd (Cadmium)≤ 0.5 ppmCo (Cobalt)≤ 0.5 ppmCu (Copper)≤ 0.5 ppmFe (Iron)≤ 10 ppmK (Potassium)≤ 5 ppmMg (Magnesium)≤ 5 ppmMn (Manganese)≤ 0.5 ppmNa (Sodium)≤ 200 ppmNi (Nickel)≤ 1.0 ppmPb (Lead)≤ 0.5 ppmSb (Antimony)≤ 5 ppmZn (Zinc)≤ 2 ppmMatter precipitated by ammoniapasses testVolatile acids (as Acetic acid)≤ 10 ppmSubstances reducing potassium permanganate (as O)≤ 10 ppmInsoluble matter≤ 10 ppm

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany


CorrosionExclamation mark

Signal Word


Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B

Storage Class Code

8B - Non-combustible, corrosive hazardous materials



Flash Point(F)

does not flash

Flash Point(C)

does not flash


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