Plastic and rubber density

A sample hung on a wire is weighed with a specified accuracy. Then, the still hanging sample is submerged in an immersive liquid in an immersion beaker, with the sample supported. The immersed sample is weighed with a specified accuracy. Knowing the sample mass determined in air and in water, the weight automatically determines the density.

Testing norms

  • PN-EN ISO 1183-1, method A – Nonporous plastic density determination methods
  • ISO 2781, method B – Rubber, vulcanized or thermoplastic, density determination.


  • analytical balance with density determining adapter
Document No. Title/Description
PN-EN ISO 1183-1 Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pyknometer method and titration method
ISO 2781 Rubber, vulcanized or thermoplastic - Determination of density