Molding Process
3 Aufrufe
Yellowing of PMMA products
Problembeschreibung
PMMA transparent products yellow and transparency decreases.
Ursachenanalyse
Processing temperature too high >260°C or residence time too long causes thermal degradation; PMMA depolymerizes to produce monomer MMA which is colored.
Lösung
Strictly control processing temperature at 200-240°C not exceeding 260°C; shorten residence time; use stabilized PMMA grades.
Wichtigste Erkenntnis
PMMA thermal stability is limited; strict temperature control is the key.
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