Molding Process
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Yellowing of PMMA products
Problem Phenomenon
PMMA transparent products yellow and transparency decreases.
Cause Analysis
Processing temperature too high >260°C or residence time too long causes thermal degradation; PMMA depolymerizes to produce monomer MMA which is colored.
Solution
Strictly control processing temperature at 200-240°C not exceeding 260°C; shorten residence time; use stabilized PMMA grades.
Key Takeaway
PMMA thermal stability is limited; strict temperature control is the key.
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