Molding Process
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PC solvent-induced cracking
Problem Phenomenon
Spider-web-like fine cracks appear after products contact alcohol, cleaning agents, or gasoline, concentrated outbreak on the assembly line
Cause Analysis
PC has poor solvent resistance; ketones, esters, strong alkalis and aromatic solvents penetrate the surface layer reducing intermolecular forces, and residual stress is instantly released under solvent induction forming cracks
Solution
①Check all chemicals in assembly and cleaning processes, prohibit ketone and ester solvents; ②Switching to compatible cleaning agents other than isopropanol requires prior verification; ③High-stress parts used after annealing to reduce stress
Key Takeaway
Solvent cracking is the superposition of residual stress and chemical attack; controlling the chemical list and reducing residual stress are both indispensable；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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