Scope:

ASTM D1603 includes carbon black content identification in olefin plastics such as polyethylene, polypropylene, and polybutylene. Quality control measurement in olefins is done by using this test. It is not advised to use it for acrylic or other polar monomer adjustments, non-volatile pigments or fillers other than carbon black.

Test Procedure:

In the ASTM D1603 test method, a sample of well-known mass is placed in a weighted combustion vessel. This sample is placed underneath a dry, oxygen-free purge of Nitrogen in a 600°C tube furnace. The combustion vessel with the remnants of burnt residue is cooled and measured after a certain length of time under nitrogen purge. A 600°C muffle furnace is mounted to oxidize the carbon residue. The combustion vessel is cooled and measured until the carbon is fully oxidized.

Specimen size:

One to a few grams

Data:

The percent carbon black is given by the equation; (Wrt-Wrm)Ws*100

Wrt = the mass of the residue from the tube furnace

Wrm= the mass of the residue from the muffle furnace

Ws= the original mass of the sample

Conclusion: 

ASTM D1603 test method covers the determination of the carbon black content in polyethylene, polypropylene, and polybutylene plastics.