Testing device for Non dispersible matter
Standard Test Method for non-dispersible matter by mechanical flushing (NDM).
The process provides information of the content of coarse impurities or constituents which are insoluble in water, such as ceramic constituents, metals or heavily compacted pigments.
A sample is mechanically flushed with water through a wire-mesh screen of a specific size until all that remains is a non-dispersible matter of the sampling.
This non-dispersible matter is dried, weighed and the amount of residues is expressed as mg/kg (ppm) of the original sample.
This method delivers rapid results, which can be compared with the stipulated limit values in quality control. In some cases, the impurities need to be categorised under an optical microscope on the basis of their colour, form and surface quality. Magnetic constituents can be detected with bar magnets. Further qualitative analysis can be conducted to establish the origin of impurities ( e.g. X-ray microanalysis (XMA) or energy dispersive X-ray microanalysis (EDX)).
Determination of non-dispersible matter after mechanical water flushing of for example regular untreated carbon blacks (may not be applicable to oil-treated carbon blacks because the oil would prevent proper wetting of the black by water)
General procedure for testing pigments and fillers
Functional principle according to ASTM D 7724
- High-quality, reliable and durable technology
- Easy handling, servicing and evaluation
- Fully-automatic operating program
- Collecting tank 50liter with integrated water pump (fully automatic)
- Handy screens (diameter 105 mm)
- Easy sieve entry and removal
- Absolute reproducibility of screening results
- No dust forming due to sealed construction
- Glass vessel for observation of process
- Automatic lifting system for vessel lid
- Low noise level