Chrome oxide green, also known as chromium oxide, chromium oxide green, chromium sesquioxide or chromia, is one of four oxides of chromium. It is commonly called chrome green or chromium green when used as a pigment. Chromium oxide is a crystalline green powder, which has been classified as Pigment Green 17 and C.I. 77288 by the Colour Index System.
Its basic chemical composition is Cr2O3. Chrome green is not soluble in water, acids and alkalis. It can be used to refer to a mixture of chrome yellow (Lead Chromate) and Prussian blue (Ferrocyanate). Chrome Oxide Green is used in a wide variety of applications because of its excellent opacity, outdoor durability and heat fastness. Its hardness is also highly valued for surface finishing, where Chrome Oxide Greens are used as abrasive components. They are also used as a base oxide to produce several other metal oxide based pigments.
Chrome oxide green is used as raw material in the preparation of pigments for porcelain, ceramic glazes, plastics, cements, roofing tiles, linoleum, industrial coatings, frits, colored glass, stainless steel electrodes, paints, industrial coatings, inks and as catalyst in the chemical industry. In addition to these areas, it is also used in the production of aerospace super-alloys and refractory bricks for glass and fiberglass industry.
In order to meet the requirements from customers in different lines, we produce several grades of high quality and stable quality chrome oxide greens, they are refractory and technical grade, metallurgical grade, pigment grade, coating grade, construction grade.
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Most cadmium pigments are used in plastics. These pigments disperse well in most polymers to give good colouring and high opacity and tinting strength. The pigments are insoluble in organic solvents, have good resistance to alkalis and in most cases will remain colour fast for the life of the plastic. As a result, cadmium pigments have been used in a wide range of plastic products. Nowadays, their greatest application is in complex polymers which are processed at higher temperatures and require the unique durability and technical performance of a cadmium pigment. Their use is almost mandatory in many nylon, acrylonitrile butadiene styrene (ABS), polycarbonates, high density polyethylene, silicone resins and other modern thermoplastic polymers processed at high temperatures which preclude the use of organic pigments and also most alternative inorganic pigments in the range of hues provided by cadmium. Cadmium pigmented engineering polymers such as ABS are widely used in products which include telephones, gas pipes and fittings, electricity cables, beverage crates and motor vehicle radiator fans. Pigments are usually incorporated in plastics in proportions of 0.01 to 0.75 per cent by weight.
(b) Specialist and industrial paints
Bright cadmium yellows, oranges and reds are major pigments for artists’ colours where their permanence and opacity are the accepted standards against which other pigments are judged.
Cadmium yellows and reds can have service temperatures well above 300 C and are used in coatings for process chemical and steam pipes. They can also be incorporated in latex and acrylic coatings.
Cadmium pigments are usually incorporated in these paints in proportions of 10 to 15 per cent by weight.
(c) Ceramics and glasses
The unique abilities of highly stable cadmium pigments to withstand high processing and service temperatures make them the only choice in much of their colour range for glasses, ceramic glazes and vitreous and porcelain enamels. In transparent glasses the cadmium pigment particles are colloidally dispersed to produce the colours by selective absorption and scattering. The addition of 0.5 percent by weight of cadmium pigment produces bright transparent glasses with colour ranging from intense yellow through to ruby red depending upon the composition.
The bright colours of cadmium pigments are ideally suited to ceramics, vitreous enamels for glass and porcelain enamels for iron and steel domestic products.
(d) Miscellaneous uses
Cadmium pigments have a number of other minor uses in rubber, paper and inks although these are small in terms of cadmium consumption.
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The invention discloses a lead-free transparent frit for ceramic preparation.
The lead-free transparent frit for ceramic preparation is made of, by weight, 60 parts of SiO2, 20 parts of Al2O3, 5 parts of MgO, 30 parts of CaO and 20 parts of K2CO3. The optimal composition and proportion are determined by screening from a great amount of tests according to the property requirements of the lead-free transparent frit.
Test results show that the lead-free transparent frit for ceramic preparation is scientific and reasonable in component proportion, and ceramic products prepared by the lead-free transparent frit are fine in glaze smoothness, excellent in enamel, especially transparent and bright, free of lead, environment-friendly and wide in application range.
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Introduction of Cadmium Orange Pigmen
Cadmium Orange pigment is cadmium zinc sulfoselenide (CdS, CdSe) produced by co-precipitating and calcining, at high temperature, a mixture of cadmium sulfide and selenide sulfide in varied ratios forming a partially crystalline structure with sometimes hexagonal or cubic forms.
Cadmium orange pigments are the most durable yellow, orange and red inorganic pigments commercially available. They have excellent chemical and heat stability, and can be used in chemically aggressive environments and durable applications without color fade.
Cadmium sulfoselenide pigments were developed in response to the need for stable shades of cadmium orange to red colors. Cadmium and selenide salts are co-precipitated and then heated to 300°C.
This article comes from naturalpigments edit released