Meaning
Standardized procedures determine the mass change of solid residues when heated under specific atmospheric conditions. Adherence to astm d7348 provides a measure of the residual carbon content in mineral additives or fillers used in industrial polymer composites. This value establishes the purity of a substance following a thermal reaction.
Filler Quality
Heat application drives off volatile matter and combusts carbonaceous material until the sample reaches a stable state. The resulting loss indicates the cleanliness of inorganic reinforcements such as fly ash or calcined clays. High carbon levels in these materials interfere with the chemical bonding between the polymer resin and the mineral surface.
Part Performance
Residual carbon acts as a contaminant that disrupts the consistent surface chemistry required for high performance mouldings. If the value measured by astm d7348 exceeds the tolerance set in the material specification, the final component may exhibit reduced tensile strength or visible surface defects. This data allows for the adjustment of compounding ratios or the modification of coupling agent loading.
Experimental Precision
The sample is weighed before and after exposure to furnace temperatures typically ranging between 750 and 950 degrees Celsius. Constant mass is achieved when subsequent weighings show no further reduction in the total weight of the crucible and its contents. This rigorous approach prevents the underestimation of organic content in the feedstock which could otherwise lead to outgassing during the injection moulding cycle.
Air flow must be maintained to ensure that all carbon is oxidized to CO2.
