Specific Gravity of any elastometer is of considerable importance for its identification. Besides it can also be used for providing a rough assessment of it's physical properties. It can also be used for finding if the sample and the product are prepared from the same compound or not . A specific gravity balance may be used to find the specific gravity of plastics and other elastomers directly without involving any calculations. The time taken to find the specific gravity with the help of this balance is about a half a minute only.