Material Analysis
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ASA solvent bonding stress cracking
Problem Phenomenon
After ASA is solvent bonded with cyclohexane etc., microcracks appear at the joint, strength test dispersion is large, and cracks expand after storage.
Cause Analysis
Solvent softens the ASA surface layer to achieve bonding, but when solvent penetration is excessive or volatilization is incomplete, the residual zone becomes a stress concentration and embrittlement band; internal stress and solvent synergistically induce cracking.
Solution
①Control solvent dosage and coating uniformity; ②fully ventilate and volatilize after bonding; ③select recommended solvents (cyclohexane, butanone, etc.); ④low-stress molding at bonding areas and perform strength sampling.
Key Takeaway
ASA solvent bonding is an efficient process but the window must be controlled; solvent residue is a hidden danger of delayed cracking; bonding strength sampling prevents dispersion from getting out of control.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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