Precipitate laboratory: identifying an unknown industrial deposit

An unknown industrial deposit can appear on a metal surface, process equipment, a circuit, packaging, a mineral material, or a polymer part. This type of contamination can cause appearance defects, performance losses, quality non-conformities, production stoppages, corrosion, or cleaning difficulties. To address the problem sustainably, it is essential to identify the chemical nature of the deposit, estimate its composition, and understand its likely origin in the industrial environment.

For an initial assessment, the laboratory uses in particular SEM-EDX to observe the morphology of the deposit and obtain a semi-quantitative identification of its elemental chemical composition. This approach is particularly useful for deposits on metal parts, filters, particles, or technical surfaces. To learn more about this capability, see our Laboratory SEM Analysis page.

Using a precipitate laboratory or a deposit identification laboratory is relevant as soon as a deposit appears unexpectedly in a bath, pipeline, reactor, heat exchanger, tank, packaging, or on finished parts. Analysis makes it possible to distinguish a process residue, a mineral salt, an oxide, a corrosion deposit, external contamination, material leaching, or an organic compound resulting from a chemical interaction.

The laboratory relies on complementary analytical techniques to handle a wide range of samples: metallic, mineral, or organic deposits, particles, surface contamination, or process residues. This cross-disciplinary approach makes it possible to better characterize an unknown industrial deposit and avoid a partial reading of the problem. Depending on the case, the investigation can be linked to other structure or inclusion analysis, as presented on our Laboratory Inclusion Analysis page.

The laboratory implements an analysis strategy tailored to the presumed nature of the industrial deposit, the amount available, and the substrate involved. The goal is to characterize the elemental, mineral, or organic fraction of the deposit, then interpret the results to guide corrective actions. Depending on the need, the investigation can be supplemented by expertise in corrosion, materials, pollutant leaching, or by an on-site audit to connect the analytical results with real production conditions.

When the deposit has a metallic component, the quantification of chemical elements can be carried out by ICP-MS or ICP-AES. For a mineral deposit, XRD makes it possible to identify and quantify crystalline phases. If the deposit contains an organic fraction, analysis by FTIR or GC/MS can be implemented to characterize the compounds present. In addition, expertise in Laboratory Metal Analysis can help link the deposit to a phenomenon of corrosion, wear, or material-process interaction.

The value of independent expertise is to obtain results that can be used for quality, production, maintenance, and HSE. The laboratory can also work on related issues such as material identification, contamination characterization, or defect analysis. For projects involving innovation, analytical development, or specific studies, it is possible to rely on the expertise of a Approved Cir Laboratory.

Beyond the analytical result, the laboratory supports manufacturers in understanding the observed phenomenon. If the origin of the deposit is not immediately identified, support can continue with a detailed analysis of the production environment and, if necessary, an on-site audit. The goal is to connect the composition of the deposit to the materials, fluids, equipment, thermal conditions, or cleaning sequences in order to define lasting corrective actions.

After identification, the composition of the deposit should be compared with raw materials, process fluids, contact surfaces, cleaning products, water, packaging, or storage environments. The laboratory can help define a targeted study plan: comparative analysis, additional tests, verification of a corrosion or leaching hypothesis, and prioritization of the most likely causes. This approach then makes it possible to correct the process, adapt the materials, or strengthen controls.