Iron oxide pigments mainly include ferric oxide red, ferric oxide yellow, ferric oxide black and ferric oxide brown and other colors. The following is an example of ferric oxide red used by omin pigments to introduce how to judge the quality of ferric oxide pigments:
Iron oxide red is available in both natural and synthetic forms. Natural west red, is basically pure iron oxide, red powder. Iron oxide red has excellent light and high temperature resistance, and resistance to atmospheric influence, pollution gas, resistance to all kinds of alkali. In concentrated acids it is only gradually dissolved by heating. Iron red alias iron oxide, burning limonite, burning ochre, iron red, red powder, Venice red (the main component of iron oxide) and so on.
Iron red oil absorption, particle shape and particle size, surface area, relative density and so on are determined by the preparation method.
Iron oxide red can be prepared by wet and dry methods: wet method is to take iron filings, sulfuric acid (or nitric acid), caustic soda as the main raw material to prepare crystal seeds, crystal seed growth and air oxidation in the solution to form iron oxide red, which is then filtered and dried.
Dry method is based on ferrous sulfate, iron oxide black or iron oxide yellow as raw materials, high temperature calcining form iron oxide red, the product shape can be spherical or needle.
Iron oxide red products shall be inspected by the quality inspection department of the manufacturer, and the quality of all iron oxide red products shall be guaranteed to meet the technical requirements of this standard.
"Iron content in iron oxide red products of the technical indicators", "105 degrees of volatile matter", "water insoluble substance", "water soluble chloride and sulfate" and "screenings", "water slurry pH value", "oil absorption", "color", "relative tinting strength and so on nine" as the factory inspection items, after each batch of products should be item by item according to the provisions of this standard test method for inspection.
The iron oxide pigment of hebei aoming pigment manufacturing co., LTD., each batch of products are strictly in accordance with the technical requirements of inspection and qualified before being allowed to leave the factory, in the actual use of the feedback results also proved that the quality of pigments is fully qualified and durable, high standards of production, high standards of inspection, to make high-quality pigments.
