Characterization of a cosmetic defect (bump or hollow, size, morphology),

The characterization of a surface defect is a visual and structural analysis that allows for the identification, measurement, and understanding of the origin of a physical flaw present on a material or finished product. Bump, dent, scratch, sink mark, inclusion, or deformation: any surface anomaly can compromise the perceived quality of a product, trigger a supplier dispute, or reveal a malfunction in the manufacturing process. Objectifying this defect through laboratory analysis, rather than a simple visual inspection, allows you to document a non-conformity, resolve a claim, and ensure the long-term reliability of your production.

What defects and matrices are involved?
This analysis applies to a wide range of products, particularly in the packaging and plastics industries: bottles, caps, films, and injection-molded or thermoformed plastic parts. It characterizes both defects visible to the naked eye (bumps, dents, ejection marks, weld lines, surface finish defects) and microscopic anomalies (microcracks, porosity, inclusions, foreign bodies). For each case, the objective is to determine the nature of the defect, its size, its morphology, and, when possible, its origin.

Which analysis methods are used?
The choice of technique depends on the size of the defect, the material, and the level of detail required. Optical microscopy offers a quick initial observation of macroscopic defects. Scanning electron microscopy (SEM) allows observation at very high magnification, down to the nanometer scale, and when coupled with EDX, it also identifies the local chemical composition of an inclusion or foreign body. Finally, 3D scanning maps the surface of the part and precisely quantifies the geometry of the defect (depth of a depression, height of a bump). These approaches are often complementary and can be combined within the same expert report. For further information, consult our blog articles on laboratory SEM analysis and on materials deformulation, which is useful when a defect is related to the material's composition.

For which sectors?
This service mainly concerns the packaging , polymers and materials, but extends to any industrialist facing a cosmetic defect on a finished product or component.

Why choose YesWeLab?
At YesWeLab, we collaborate with a rigorously selected network of laboratories, most of which are certified and/or accredited (ISO 17025, COFRAC). These laboratories are chosen based on your specific needs, the matrices to be analyzed, and the required analytical techniques or methods. If you have any particular requirements, please do not hesitate to specify them in your request: our scientific team will do everything possible to respond accurately and promptly. Since 2020, numerous manufacturers, distributors, and engineering firms have entrusted us with the management of their analyses, sending us their samples through our digital platform. To learn more or submit a specific request, contact our team today.