BS 2782-6:Methods 620A to 620D:1991

1 Scope and field of application
2 References
3 Definitions
4 Conditioning
5 Methods
6 Correction for buoyancy of air
7 Test report
Annex - Liquid systems for density gradient columns

Four methods for plastics in the form of sheet, film, tube, powder, granules, etc.

1.1 This International Standard specifies four methods for the determination of the density and relative density of non-cellular plastics in the form of sheet, film, tube, moulded objects, and moulding powders, granules and pellets.

– Method A

Immersion method for plastics in a finished condition, whether machined or otherwise formed (see 5.1.3), but not powders.

– Method B

Pyknometer method for plastics in the form of powder, granules, pellets, flake or moulded articles reduced to small particles.

– Method C

Titration method for plastics in forms similar to those required for method A, including pellets.

– Method D

Density gradient column method for plastics in forms similar to those required for method A, and including pellets. Density gradient columns are columns of liquid, the densities of which increase uniformly from top to bottom. They are particularly suited to measurement of small samples of products and to comparison of densities.