Meaning
Thermal analysis vessels constructed from a high purity alloy of platinum and gold are designated as a platinum gold crucible. These containers provide an inert environment for the chemical breakdown of polymers during thermogravimetric analysis and differential scanning calorimetry. Stability at high temperatures prevents unwanted reactions between the container wall and the organic samples under investigation.
Processing Impact
Accurate resin characterization depends on this metallurgical consistency to avoid baseline drift during testing cycles. A platinum gold crucible suppresses catalytic oxidation that would occur in standard ceramic or metallic pans when heating volatile additives or halogenated polymers. The high cost of these units demands dedicated cleaning protocols to prevent cross contamination between different polymer batches.
Moulders rely on these precise thermal curves to set processing windows for complex injection moulding operations.
Material Economics
Virgin resin grades require higher purity standards during testing than production batches containing recycled content. Laboratory personnel select this vessel type specifically to minimize noise during the determination of melt flow rates and glass transition temperatures. Regrind materials often contain impurities that degrade the contact surface of the alloy if the crucible material is not sufficiently inert.
Proper selection ensures the reported thermal property values remain traceable to standard testing protocols.
Technical Boundary
Constant mass loss calibration confirms the integrity of the vessel during extended high temperature exposure. Chemical leaching from the molten sample limits the effective life of the container when handling additives like flame retardants. Every unit eventually shows signs of physical deformation or surface pitting after repeated heating cycles.
Analytical accuracy falls away once the interior geometry deviates from the manufacturer specifications.
