Chemical Sciences, Earth, Atmosphere & Environment Sciences


Production of Superior Quality Writing Chalk Sticks


Chemical Sciences, Earth, Atmosphere & Environment Sciences

Focus Area:

Production of Writing Chalk Sticks

Social Benefits:

This chalk has ability to write four times more than the ordinary gypsum base chalk and 1.3 times more than the imported chalk, It has high bulk density, smooth finish, dust-free nature, and minimum handling breakage, less sensitive towards moisture, good visibility of writing and easy wiping qualities.

Developing Agency:

CSIR-Central Salt & Marine Chemicals Research Institute (CSMCRI), Gujarat

Technology Readiness Index:

Market Launch

Website Link :
Source (more info) :

Brief Description

Description :

It is prepared by mixing of Calcium Carbonate (CaCO3), other different additives and binder with water in the mixing machine. This wet material is converted in to cartridge (tablet)which is then utilized for extrusion through specially designed chalk extruded machine .The wet long sticks are cut in the required length pieces followed by drying. Finally grinding operation is performed manually for giving final finishing.

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