Specific gravity = 1.35 (from data sheet)ĭensity = 0.0488 lb/cu in (from conversion table) What is the approximate weight (in pounds) of 3000 - 25' x 38' sheets of. Therefore, knowing the specific gravity and with the help of a conversion table on the shared drive one can determine the weight* of any given quantity of material in almost any units. Material density g/cc ÷ 1 g/cc = material density = specific gravity This means that the specific gravity of a material is virtually the same as its density in g/cc. It just so happens that the density of water in grams per cubic centimeter (g/cc) is very close to 1 (0.9976). 010' x 24' x 48' = 1152 cu in x 0.0433 lb/cu in = 49.88 lbs.įortunately, there is a loophole in the 'no units' rule for sp gr. In the above example the stack weighs about 50 lbs.ġ00 x. The density of polycarbonate is 0.0433 lb/cu in. It's hard to determine, for instance, the weight of a 100 sheet stack of 24' x 48', 0.010' polycarbonate.

The down side is that without units you can't do anything but compare different materials.

The specific gravity value of any given material is going to be the same in the US, Germany or China! (Also, materials with a specific gravity of less than 1 will float on water) This means you don't have to worry about conversions when comparing materials that have densities using different units. The units therefore cancel each other out. Why not? Specific gravity is determined by dividing the density of a material by the density of an equal volume of water using the same units. The main difference is that density has units and specific gravity does not. They are useful in determining yield and comparing different materials. Units = none.ĭensity and specific gravity are both ways of describing the weight (mass) of a certain quantity of material. The ratio of the density of a material at a given temperature to the density of an equal volume of water at the same temperature. Specific Gravity (sp gr) - AKA relative density. pounds per cubic inch (lb/cu in or lb/in3).pounds per cubic foot (lb/cu ft or lb/ft3).grams per cubic centimeter (g/cc or g/cm3).✝ensity (D) -The mass (or weight) per unit volume of a material at a given temperature.