(iii) Decimal System: Under this system, the digits of the integral part represent a basic unit and the decimal part represents a sub-group of the basic unit.
(iv) Block System: Each digit of the decimal represents further classifications of the materials. Under this system, specific number is assigned to denote a par­ticular class of material. classification of engineering materials A large numbers of engineering materials exists in the universe such as metals and non metals (leather, rubber, asbestos, plastic, ceramics, organic polymers, composites and semi conductor). This report highlights the classification of the engineering materials and their processing techniques.