Cracks caused by residual stresses, residual stresses are mainly caused by the following three conditions, namely, overfilling, demolding, and metal inserts.
Cracks caused by external stress, the external stress here is mainly due to the unreasonable design of the stress concentration, especially at the sharp corners.
Cracks caused by the external environment, water degradation caused by chemicals, moisture absorption, and excessive use of recycled materials can deteriorate physical properties and cause cracks.
These problems are the cause of cracks in everyday plastic products. We must pay more attention to our lives!