R & D


iron oxide

iron oxide

Manufacturing Process The Laux process Reaction of black: 9 Fe + 4 C6H5NO2 + 4 H2O 3 Fe3O4 + 4 C6H5NH2 Reaction of yellow: 2 Fe + C6H5NO2 + 2 H2O 2 FeO(OH) + C6H5NH2 Reaction of red: 2 Fe3O4 + ½ O2 3 Fe2O3 Initially, the Laux process was exclusively used to manufacture aniline (C6H5NH2) from nitrobenzene (C6H5NO2). Only when in 1925 the chemist, Dr Laux, found out that the iron oxide, being a by-product of this reaction, could be used, subject to certain chemical conditions, as an iron oxide pigment with extremely high colour strength. This process is primarily used for black iron oxide (e.g. Black 330), however, the reaction to get iron oxide yel ...
read more ...
Wet Film Guage

Wet Film Guage

Place a comb perpendicular to and touching the substrate. Hold the comb in position and wait a few seconds until the teeth are wet. Remove the comb from the film. The wet film thickness lies between the biggest value ‘coated’ or ‘wet’ tooth and the smallest value ‘uncoated’ or ‘dry’ tooth. ...
read more ...
Organics vs. Inorganics – Are they different?

Organics vs. Inorganics – Are they different?

Organic pigments are synthetic materials based on carbon usually derived from petrochemicals. They generally are not stable at elevated temperatures and have partial solubility in strong solvents, but do not dissolve in water. Inorganic pigments are metal salts and oxides, some natural and some synthetic, that generally are stable at elevated temperatures and do not dissolve in solvents. Due to their stable chemical structures, most inorganic pigments have better weatherability, dispersibility and opacity than organic pigments, however they will typically have lower chromaticity and tinctorial strength. ...
read more ...