LG PMMA HI533 Resin can be used without preliminary drying. But in case of long-term storage or poor storage, it may
absorb moisture excessively. Moisture contents of 0.1% and over can cause silver streaks or blowholes inside.
Hence, it is desirable to perform preliminary drying in accordance with the following conditions.
Grades Drying Temperature Drying Time
General Purpose Grade
Optical Grade
70 ~ 80℃
4 ~ 6 hours
Impact Resistance Grade 60 ~ 70℃
Grades Drying Temperature Molding Temperature Injection Pressure
EH910 240 ~ 270℃ 70 ~ 90℃ 800 ~ 1,500kg/cm2
IH830 220 ~ 260℃ 70 ~ 80℃ 800 ~ 1,500kg/cm2
IG840 210 ~ 250℃ 70 ~ 80℃ 800 ~ 1,500kg/cm2
IF850 200 ~ 240℃ 60 ~ 80℃ 600 ~ 1,200kg/cm2
IF870 190 ~ 240℃ 60 ~ 80℃ 600 ~ 1,200kg/cm2
Impact Resistance Grade 200 ~ 250℃ 60 ~ 70℃ 500 ~ 1,100kg/cm2
In case that a molded product contacts organic solvent, annealing is absolutely necessary for the product. To
perform annealing effectively, fix the temperature at the upper limit, where defective molding products don't
appear. If you steep a product in 90% alcohol for 15 minutes, you will learn more about it.
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