
Specific Gravity


Plastic
Storage Tanks are made ratings of the specific gravity a
tank can hold. A tank with a rating of 1.5 specific
gravity (SG) should not be put into service holding a liquid
that weighs 1.8 SG. Our Double Wall Chemical Storage
Tanks are rated at 1.9 SG or above. We can even make
tanks with higher ratings, such as 2.2 SG, for specific
applications. 
... 
The specific gravity of a liquid tells you how much more or
less dense the liquid is than water. Water has a specific
gravity of 1.00. A liquid that is more dense than water,
has specific gravity is greater than 1. A liquid less dense
than water has a specific gravity is less than 1. 

To calculate the specific gravity of a liquid, take the weight of that
liquid and divide it by the weight of water. The
weight of water will vary slightly based on temperature and
pressure but for our purposes you can figure it at 8.34
pounds per gallon. 

The specific gravity of Sodium Hydroxide varies based on the
concentration and the temperature. The specific
gravity of a 50% solution of Sodium Hydroxide at 68 degrees
F. is 1.52. 

