About Carbon Black Dispersion Testing

Pigments and carbon black are used in the polyethylene pipe industry for material identification as well as for surface protection to maintain physical and mechanical properties.

  • Approach

    Samples of pipe material are cut and pressed between microscope slides and then melted between 150°C and 210°C.  The pressed sample is examined under high magnification and the dispersed particles are graded by their size distribution.  The method calls out how to grade the materials based on particle size distributions.

  • Sample Considerations

    A total of 6 samples must be able to be removed from different parts of the product.  Each of these samples must weigh 0.60 grams.

  • Experience

    This is a standard test method for polyolefin pipes.