MaTestLab > Test Standards > ASTM D1895 Standard Test Methods for Apparent Density, Bulk Factor, and Pourability of Plastic Materials
ASTM D1895 Standard Test Methods for Apparent Density, Bulk Factor, and Pourability of Plastic Materials
The apparent density, bulk factor, and, where appropriate, the pourability of plastic materials like molding powders are all covered by ASTM D1895 test method. For the application of the many regularly encountered forms of these materials, from small powders and granules to large flakes and cut fibers, multiple techniques are provided. ASTM D1895 test methods provide useful indexes of performance of plastic materials such as powders and granules with respect to their handling in packaging and fabrication. The values stated in SI units are to be regarded as the standard in reporting ASTM D1895 test results.
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Introduction to ASTM D1895
The ASTM D1895 Standard Test Methods for Plastic Materials outline the physical characteristics of plastics, including apparent density, bulk factor, and pourability. This helps in product design, handling, and processing. The standard promotes consistent measurements and standardized testing processes, enabling better characterization and comparison of different plastic materials.
ASTM D1895 test methods provide useful indexes of performance of plastic materials such as powders and granules with respect to their handling in packaging and fabrication. The values stated in SI units are to be regarded as the standard in reporting ASTM D1895 test results. MaTestLab has the best network of testing labs in the USA and other countries.
ASTM D1895 Test Procedure
Specimen Selection
An accurate plastic substance is deemed essential for obtaining accurate test results because it is free from impurities and extraneous particles. It is ensured that there is sufficient substance to fill the equipment adequately, thus guaranteeing precise measurements.
Test Setup and Execution
The apparent density of the plastic material is measured using a calibrated container, and the mass of an empty container is weighed and recorded. The material is poured into the container, ensuring there are no voids or air pockets. The apparent density is calculated using W)/V. The surface is leveled, and the loose material is weighed. The container is tapped, and its weight is measured again. The bulk factor is calculated using the provided formula. The material’s pourability is measured using a standard funnel, and its flow behavior is recorded.
ASTM D1895 Test Specimens
Specimen Details
ASTM D1895 testing requires a representative, free-from-contaminants plastic material specimen from a homogenized batch for consistency and accuracy in measurements.
Specimen Dimensions
Uniform density in apparent density requires particulate particles of consistent size and shape, similar bulk factor particle distribution, and loose, granular pourability specimens, avoiding compacting or agglomerating particles.
ASTM D1895 Test Results
Apparent density is a crucial aspect of plastic material properties, expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). Higher-density materials have greater compactness and mass per unit volume, while lower-density materials have lower values. Apparent density provides information about packing and space-filling characteristics. Bulk factor, a dimensionless value, offers insights into material flowability and compressibility. Pourability, a qualitative assessment of a material’s ability to flow freely through a funnel, is essential for smooth and consistent flow.
Tests Related to ASTM D1895
Important tests relevant to ASTM D1895 include ASTM D792 for Density and Specific Gravity of Plastics by Displacement, ASTM D883 Terminology Relating to Plastics, and ASTM D1505 Test Method for Density of Plastics by the Density Gradient Technique.
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