Aluminum potassium sulfate 12 hydrate 99.5% AR [7784-24-9]
Aluminum potassium sulfate was used to cure gelatin emulsions by introducing, bathing exposed plates prior to development or use in a fixative bath. Mixed with citric or other acid, it has also been used as a cleaning bath to remove developer stains in negatives.
Density: 1.75 g / cm3 (20 ° C)
Melting point: 92.5 ° C
PH value: 3.0 – 3.5 (100 g / l, H₂O, 20 ° C)
Bulk density: 900 kg / m3
Solubility: 139 g / l
insoluble substance: ≤ 0.005%
PH value (10%; in water): 3.0 – 3.5
Chloride (Cl): ≤ 0.0005%
Heavy metals (as Pb): ≤ 0.001%
Cd (cadmium): ≤ 0.0005%
Cu (copper): ≤ 0.0005%
Fe (iron): ≤ 0.0005%
Na (sodium): ≤ 0.005%
NH₄ (ammonium): ≤ 0.005%
Pb (lead): ≤ 0.0005%
Labeling of hazardous chemicals and mixtures that are part of the Globally Harmonized System of Classification and Labeling of Chemicals (GHS). The pictograms recommended by GHS have the shape of a square set on the top. They should contain a black symbol on a white background with a red border.
Priority rules to be observed in connection with the labeling of a substance:
– the skull and crossbones, the exclamation mark pictogram should not be added.
– corrosive effect, the exclamation mark pictogram should not be added if it concerns eye or skin irritation.
– health hazard determining respiratory sensitization, the exclamation mark pictogram should not be added if it concerns skin sensitization or irritation to eyes or skin.
Source: GHS pictograms