Chemical composition : Black or dark red powder. Insoluble in water, alcohol, soluble in strong acid, hot acid. Fusion point: 1538 ℃ (lit.) Density: 4.8-5.1 g/ml at 25 ℃(lit.) English synonyms: magnetite; refined iron; pigment black, black oxide
Item |
index |
Test method |
320Mesh/360Mesh/400Mesh |
appearance |
Black powder |
tinting power |
Black iron oxide content % |
≥80 |
GB1861-80 |
hydrotrope % |
≤0.8 |
GB5211.2 |
screenings % |
≤0.5 |
GB1715-79(Wet) |
PH value of aqueous suspension |
6~8.5 |
GB717-70 |
moisture % |
≤0.7 |
GB1714-79 |
oil absorb % |
10~20 |
GB1712-79 |
Hiding g / square meter |
≤20 |
GB1709-79 | |