FEPREN
Iron Oxide Pigments
Iron oxide pigments are red, black, brown, green, yellow and orange pigments manufactured from ferrous sulfate (an intermediate product from titanium dioxide manufacturing). It is a non-toxic pigment which comes in the form of powder and granulate. It is used for colouring coating, sealants, plastics, artificial leather and leather imitations, rubber and paper products, as well as ceramic pigments, glass and polishing products. The most frequent application is in the construction industry, in prefabricate manufacturing, concrete and clay roof tiling, coloured cement, bricks and tiling.
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For construction
FEPREN Iron oxide pigments find their widest range of application in the construction industry, especially for colouring concrete construction elements, such as concrete tiling, interlocking paving, concrete roof tiling, artificial rock, dry plaster mixes and asphalt or bitumen.
FEPREN pigments fulfill strict criteria for applications in the construction industry as defined by the European Standard EN 12878 to which they are certified. They show good weather resistance which is ensured by the fact that the products are synthetic pigments based on stable iron oxides. Light fastness has been confirmed by a number of tests. Generally, iron oxides are resistant to alkalis and are characterized by a high coloring power, which in the case of FEPREN pigments is guaranteed by the fact that they are synthetic pigments without any other constituents / fillers. If applied correctly, FEPREN pigments show good dispersibility (the ability to be processed) in concrete mixtures. Pigments based on iron oxides are inert and, therefore, environmentally safe.
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For asphalt concrete and emulsions
Asphalt is a natural or a synthetically manufactured mixture of bitumen, mineral substances and other additives and admixtures. Asphalt binder allows colouring with inorganic colour pigments thus creating diverse asphalt surfaces. Colour differentiation not only improves the aesthetic value of asphalt surfaces but it also contributes to visibility of local traffic and improves safety of traffic in such sections.
Transparent binders with the same manufacturing and user qualities are an alternative to standard asphalts but their colour is neutral with a slight yellowing hue. Here, inorganic pigments are effective especially if they are combined with mineral elements of a matching colour.
For paints
For plastics
Iron oxides are stable at the temperature of up to 600° C; yellow and, partially, also black pigments can be used safely at the temperature of up to 150° C. Crystalline water is released above this threshold with yellow pigments and increased temperature in the presence of oxygen can lead to oxidation of black pigments. Both these processes also cause a change of colour.
Most plastics are processed at around 200° C; therefore, usability of regular ferric yellow and black pigments is limited to plastics which are processed at low temperatures. Only thermostable yellow and black pigments or pigments with an increased thermal resistance secured by surface treatment can be used in other plastics.
Another factor limiting the use of ferric pigments is the particle (agglomerate) size or pigment milling grade. For certain plastics manufacturing methods such as pressing, extrusion or rolling finely milled pigments can be used; for blowing, injection molding or dry spinning and filament drawing micronized pigments are recommended.
FEPREN iron oxide conform to hygienic standards for substances which come in contact with foodstuffs.