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Acrypet IRH-30 PMMA量大優惠相關介紹如下（三菱麗陽）：

Annealing of molded products

So residual stress just after quick cooling still remains in a molded product that cracks may be formed in the paint process or at the contact with solvent. To prevent such crack forming, heat a molded product to the slightly lower temperature than the formable temperature to remove this residual stress