Heubach’s Inorganic Pigments
Inorganic pigments are almost exclusively based on oxide, oxide hydroxide, sulfide, silicate, sulfate, or carbonate and can be classified into four main groups: white pigments, black pigments (carbon black), colored pigments, and specialty pigments.
Heubach focuses on the production and development of colored inorganic pigments, especially complex inorganic colored pigments (CICPs) and (encapsulated) bismuth vanadate pigments.
Inorganic Pigments (PDF)
Learn more about Heubach’s inorganic pigment range
Complex inorganic colored pigments
The quality and performance of consumer and industrial products as well as the requirements placed on their appearance and durability continue to grow. The result is steadily increasing demand for more durable yet cost-effective pigments which take into account the ecological aspects of the end product.
As a consequence, complex inorganic color pigments are of increasing importance to formulators. By optimizing the well-known chrome and nickel titanium yellow chemistries, they offer a versatile tool for formulating economic, stable, and innovative coatings in various colors (from yellow to green, blue and black). This is based on metal ions such as zinc, iron, titanium, nickel, cobalt, manganese, trivalent chromium, and antimony, which are hosted safely in stable lattices.
A much higher hiding of a coating can be achieved using CICPs instead of organic pigments, as a much higher pigment loading is possible due to their very low oil absorption. CICPs are therefore frequently used in combination with organic pigments for brilliant colored coatings, e.g., for lead-free topcoats.
Thanks to the fact that they offer outstanding light fastness and resistance to temperatures, chemicals (including acid and alkali), and weathering, they are also especially suitable for coatings which have to meet high durability standards. These include, for example, powder and coil coatings and baking enamels as well as plastics and exterior building products, such as cement, concrete, roofing granules, and ceramic applications.
Nickel Rutile (PY 53) and Chrome Rutile Pigments (PBr 24)
Nickel rutiles are light lemon-yellow pigments with different color shades. These are obtained by varying the calcination temperature and time, resulting in different particle sizes. The higher and longer the calcination temperature, the darker and redder the shade of the final product.
The color of chrome rutiles varies from light to medium ocher, depending on the particle size and coloring ion content. As with the nickel rutile pigments, the PBr 24 products become darker and redder by applying a higher temperature and increased calcination time.
A very important use for nickel and chrome rutile yellows is in industrial and architectural coatings as well as in the building industry, especially for coil coating steel and aluminum but also for machinery, vehicles, or containers.
Furthermore, rutile yellow pigments can be safely used in all plastics applications (PE, PP, PVC, etc.), such as in rigid poly(vinyl chloride) for outdoor use, for masterbatches, and for building products.
Rutile yellow pigments are being increasingly used in engineering plastics (ABS, PC, etc.) – for example in automotive applications, fibers, and thin film plastics – as a replacement for cadmium yellows, which have adverse toxicological and ecological properties. They can be deployed more economically for this field of application than a combination of titanium dioxide and expensive organic pigments.
(Inverse) Spinel Pigments (PBl 28, PBl 36, PG 50)
By increasing the trivalent chromium content in the crystal structure, the color shades in Heubach’s blue spinel pigments range from a red shade blue (PBl 28) to a green shade blue (PBl 36). A brilliant green is obtained with the PG 50, a complex inorganic color pigment using cobalt, zinc, aluminum, titanium, and nickel.
Typical applications for (inverse) spinel pigments are once again those which require high durability: Examples include coil coating, outside powder coatings, plasters, architectural coatings, and concrete.
Iron Chromate Brown Pigments (PBr 29)
These products exhibit colors from a warm chocolate brown to a dark, blue shade of brown.
PBr 29 pigments are used in cases where the cheaper iron oxides exhibit lower performance with respect to stability, color shade, and rheology.
Typical applications for PBr 29 include plastics, specifically PVC, where they offer much higher stability compared to iron oxides.
Black Spinel Pigments (PBk 27, PBk 28)
Black spinel pigments (PBk 27, PBk 28) are highly durable black color options.
Although black spinels show less jetness and color strength compared to carbon black, they are used in more demanding applications to increase temperature resistance and weathering stability. As a consequence, they are used in cookware coatings, silicone temperature resistant coatings, coil coatings, and ceramic applications.
(Encapsulated) Bismuth Vanadate Pigments
Bismuth vanadate pigments cover the spectral range from greenish to reddish yellow. They can be used in different coatings and plastics applications, where they exhibit improved opacity, high gloss, good tinting strength, and excellent weather and light fastness, especially in reduction with TiO2. Furthermore, they are quite easily dispersible and can be used in solvent- and water-based systems.
Alumina/silica encapsulated bismuth vanadates are the most suitable class of pigments for plastic applications, which require a stable color shade even at high temperatures. Due to their encapsulation, they exhibit improved resistance to acid, alkali, and SO2 as well as heat, light, and UV radiation.