Pigments

Inorganic Pigments- They are of the type mineral-earth but generally are metallic oxides or synthetics. Pigments that are of the type Mineral-earth are very simple and naturally occurring colored substances. The preparation process is also simple and consists of the steps of washing drying, pulverizing and mixing into a formulation. The following table shows the refractive index of some of the very popular class of inorganic pigments.

Organic Pigments- Organic Pigments are not usually found in nature. That is the reason that a majority of these pigments are chemically synthesized. They contain carbon and comes with relatively low levels of toxicity, not providing any major environmental concern. Raw materials can include coal tar and petroleum distillates that are transformed into insoluble precipitates. Traditionally organic pigments are used as mass colourants. They are popular in plastics, synthetic fibres and as surface coatings-paints and inks. In recent years the organic pigments are used for hi-tech applications that includes photo-reprographics, opto-electronic displays and optical data storage

Monoazo Pigments

Diazo Pigments

Acid and base dye Pigments

Phthalocyanine Pigments

Quinacridone Pigments

Other polycyclic Pigments

Chemical structure of an Azo Pigment

Very good stability to solvents, light, heat, and weathering

Good tinctorial strength

Cost effectiveness

Consistency and unique shades

Completely non-toxic

Very bright, pure, rich colors

Organic pigments shows good color strength

Aluminium Pigments: Aluminium pigments are further divided into two categories namely leafing grade and non-leafing grade. The aluminum pigments are produced from aluminium that has purity in the range of 99.3-99.97%. The particle has lamellar shape with 0.1-2 um in thickness and diameter of 0.5-200 um. These pigments founds use in automotive topcoats.

As Corrosion protection coats

As Reflective paints

In Marine paints (covering coats)

Roof coatings

In Heat-proof and highly heat-resistance paints

Chrome effect paints

Aerosols

Zinc Pigments: Zinc Pigments come in two forms of powder and dust. Usually the zinc dust is finer as compared to powder and is spherical in shape. The dust also has a light coating of zinc oxide.