2022: ☢️ Specific Gravity of Plastic (& Formula, Definition, Infographic)

Definition

The specific gravity of plastic is the ratio of the density of plastic to that of a reference substance (Usually water).

This information can be used to tell whether plastic will float (or sink) if dropped in water (Buoyancy).

Formula

SG = ρplastic / ρwater

Note: Both densities need to be in the same unit as they will cancel each other and produce SG.

Specific Gravity vs Density vs Specific Weight

There are important differences between density, specific weight and specific gravity. Follow these links to learn about the differences between them.

I will provide you the plastic specific gravity in a dimensionless unit (Unitless) in this page. You may check how it converts to kg/m³ (SI unit), g/cm³, g/ml, kg/l, lb/ft³ by following the link below:

Specific Gravity of Plastic (Relative to Water)

Plastics have a really wide specific gravity range depending on its composition.

SG = from 0.57 to 3.9

Source: Tregaltd

Specific gravity values are not very useful. Why not check the density of plastic (all units)?

My Specific Gravity Infographic

Put the plastic specific gravity in perspective!

How about an incentive to share this post? (You will help other colleagues find this blog)

Download and enjoy my infographic:

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