As 2331.3.1 Pdf -

Here's a comprehensive feature on the topic:

In conclusion, AS 2331.3.1 is an important standard for determining the density of plastics using the density gradient column technique. The standard provides a reliable method for quality control, material selection, and research and development. You can purchase a copy of the standard from Standards Australia or access equivalent standards from international organizations. as 2331.3.1 pdf

I'm assuming you're referring to the Australian Standard AS 2331.3.1, which is a part of a series of standards for methods of testing plastics. Here's a comprehensive feature on the topic: In