Production & Quality
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ABS stress cracking (solvent induced)
Fenómeno del problema
The product shows cracks after assembly or after contacting grease and solvents for a period of time, mostly starting from high-stress areas.
Análisis de la causa
ABS has limited solvent resistance; areas with large internal residual stress undergo environmental stress cracking under the action of solvents; internal stress caused by over-holding and uneven cooling is the internal cause, and the solvent is the external cause.
Solución
①Reduce holding pressure and cool uniformly to reduce residual stress; ②anneal at 70~80℃ when necessary; ③avoid contact with incompatible solvents/greases; ④avoid excessive interference in assembly; ⑤eliminate sharp corners in the structure.
Conclusión clave
ABS 'stress + solvent = cracking': reducing internal stress and avoiding solvents both work together; residual stress is a time bomb, the solvent is just the fuse, and high-stress parts must have the stress reduced from the process.
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