Knit Lines, Weld Lines and Molding History as Hidden Causes of Surface Defects
Defects that resist every downstream fix are often molded in. How knit lines and shear skin surface as laser marking, coating and bonding problems.
Environmental Stress Cracking in Bonded and Coated Assemblies
ESC needs stress and a chemical agent together, and assembly supplies both. How adhesives, coatings and joint design create cracking data sheets never predict.
Root-Cause Analysis of a Failed Plastic Part: What FTIR, DSC, TGA and SEM Each Tell You
Choosing analytical methods for a plastics failure investigation: what question FTIR, DSC, TGA and SEM each answer, and the sequence that avoids wasted testing.
Reading a Fracture Surface: Adhesive, Cohesive and Substrate Failure
The failure mode on a broken bond tells you which part of the process to fix. Classifying adhesive, cohesive and substrate failure, and what each implicates.
Why Paint and Ink Delaminate From Molded Plastic Parts
A decision tree for coating and ink delamination on molded plastics: find the failure interface first, then surface energy, contamination or cure.
