DIN 53357 is a German standard for "Testing of plastics; determination of the density of plastics". Here's a draft paper based on the standard:

A very specific request!

This standard specifies a method for determining the density of plastics by measuring the mass of a specimen of known volume. The method is applicable to all types of plastics, including thermoplastics, thermosets, and elastomers.

The density of the specimen is calculated using the formula above. The result should be expressed in units of g/cm³ or kg/m³.