Meaning
Thermal testing methodologies measure the changes in the mass of a specimen as a function of temperature under a controlled atmosphere. Plastic processors utilize thermo-gravimetric analysis to determine the organic filler content, moisture levels, and thermal stability of polymer compounds. This analytical technique helps verify that incoming resins conform to the specified composition before production begins.
Method Description
Specimen testing involves heating a small amount of polymer in a micro-balance furnace while continuously recording weight changes. Through thermo-gravimetric analysis, the temperature at which the polymer matrix begins to decompose is precisely identified. This measurement allows technicians to determine the ratio of polymer to reinforcing fillers, such as glass fibers or carbon black.
Processing Insight
Understanding polymer degradation limits ensures that melt temperatures are set safely. Using thermo-gravimetric analysis provides the maximum temperatures above which the plastic will begin to outgas in the injection barrel.
Quality Verification
Material incoming inspection relies on checking the resin batch composition to detect contamination or excessive moisture. Applying thermo-gravimetric analysis to molded parts helps diagnose molding failures by checking if the material underwent thermal degradation during the run. This testing establishes the root cause of brittle parts and assists in optimizing the process cycle times to prevent material overheating.
