Polymethylmethacrylate
Amorphous engineering thermoplastic.
Abbreviation
PMMA
Molecular formula
C5H8O2
CAS no.
9011-14-7
General description
PMMA is a material with high strength, rigidity, heat resistance and scratch resistance. It has high optical transparency and gloss with good weather resistance and is resistant to weak acids and alkalis, non-polar solvents, fats, oils and water. However, the susceptibility to stress-cracking media (e.g. surfactants) must be taken into account. The impact strength, which is not too high, can be improved by modification, but this will impair the optical quality.
Features
Automotive interior
Automotive exterior
E&E applications
Grades with optimised chemical resistance
Grades with high optical quality
Light diffuse grades
Flame-retardant grades
Temperature stabilised grades
Impact-modified grades
Processing instructions
Drying
Adequate drying is necessary to avoid poor surface quality of the finished parts caused by moisture. ALTUGLAS™ HT types can be pre-dried up to 100 °C.
Drying temperature | 70 °C – 90 °C |
|---|---|
Drying time | 3 h – 4 h |
Residual moisture | 0,05 % |
Injection moulding
Melt temperature | max. 270 °C, see data sheets |
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Cylinder temperature | 220 – 250 °C |
Mould temperature | 70 – 80 °C |
Dwell time | min. 3 minutes to max. 10 minutes |