Stress cracking can induced by strenuous improper molding conditions, machining operations. ior thermoforming temperatures. The presence of molded-in metal terts orsharp corners in the part produces ater stress. These conditions produce small cks in the plastic; when liquid adhesive is applied, it can penetrate the part, aggravating the damage The crack may eventually propagate through the entire part, causing part failure. Molded-in stresses can be reduced by modifying the molding cycle or Only solvents, adhesives, and primers that are compatible with the plastic should be used. A minimum of adhesive should be used, and excess dhesive should be immediately cleaned up. Anaerobic threadlocking adhesives should not be ed with plastics that are Stresses induced by the threads in addition to stress from uncured adhesive outside the joint produce very high stress levels in the part. preparation methods to alleviate stress cracking include abrading the surface with sandpaper, cleaning with isopropyl alcohol, and assembling the parts immediately after application of alcohol. reduced at annealing parts after molding. to stress cracking. prone Surface