Meaning
Quality assurance reports record the non-combustible solid fraction remaining after complete thermal degradation of a plastic specimen. The resulting ash residue represents the total quantity of inorganic fillers and reinforcements present within the original compound. Extrusion plants use this metric to verify masterbatch let-down ratios before launching production runs.
Pyrolysis Analysis
Muffle furnace exposure at six hundred degrees Celsius vaporizes the organic polymer backbone while leaving mineral species intact. Spectrographic examination of the ash residue reveals the ratio of glass fibers to mineral fillers in complex engineering formulations. Uniform residue distribution across multiple melt samples confirms adequate mixing inside the compounding barrel.
Discoloration in post-burn residue signals oxidation of trace metallic impurities or heavy metal color concentrates.
Viscosity Consequence
Deviations in ash residue levels alter melt viscosity and cause wall thickness variations during injection molding. Higher inorganic content accelerates barrel wear and increases gate erosion on high-cavity tooling.
Gravimetric Limit
Standard thermal gravimetric methods isolate inorganic fractions but fail to differentiate between functional mineral fillers and inert color pigments. Organometallic flame retardants partially decompose during ignition, leaving partial residues that require chemical correction factors. Precision testing protocols combine calcination with elemental spectroscopy to resolve constituent mineral species.
