On which of the following basis is the coal tar pitch classified?

Explanation:

Coal tar pitch is classified on the basis of softening point into four grades as follows:

Additional InformationPitch 

• Most pitches used in building are obtained either as the residue of the direct distillation of crude tar produced by the high temperature carbonization of coal as a waste product.
• However, by fluxing back such pitch residues with high boiling coal tar distillates the material can be suitably conditioned to give products of desired softening points for a number of particular uses.

Uses of pitch

• Pitch is extensively used as ingredient in a number of water proofing, protective and binding compounds in masonry, timber and steel structures.
• It is also used in the manufacture of tar felt and flooring mastics, and as a base for coal tar paints designed mainly for cold applications.
• The pitch paints set by drying of the solvent.