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Identification of glass fragments

Samples and fragments of unknown material that may be glass are analyzed and identified. It can for example concern customer complaints where glass splinters or glass fragments were found in foodstuff.

Purpose

The purpose is to verify whether splinters, fragments, pieces are of glass, to identify the type of glass, and to give an opinion on possible origin.

The result can be used as a basis for dialogue with customers in complaints cases, and to determine whether the source can be derived from their own production.

Method

The examination begins with a visual and light microscope review. We can often determine at an early stage if it is not glass, but for example plastic. Depending on the size and appearance, it can sometimes be seen how the glass broke and some information about how it was manufactured. The next step is to analyze the sample using X-ray spectroscopy (EDS) in scanning electron microscope (SEM). For the analysis, we need to cut out and prepare a small piece. If the sample is very small, it all goes to the analysis.

We compare with known glass samples and get a quantitative chemical analysis of the main components. We can then decide what type of glass it is and give comments about what such glass is usually used for. Many glasses are chemically quite similar, but if you have samples of a possible original glass to compare with, it can be determined whether it can be the same source or not.

Deliveries

A report with photo, chemical composition, and expert opinion on glass type and possible origin.

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Service

Analysis of unknown materials and fragments suspected to be glass, and identification of glass type

Price

Price on tender

Delivery time

The result is normally reported within three working weeks from the time that the sample has arrived at RISE, Glas in Växjö, Sweden. Urgent handling can be arranged when needed.

Preparations

Pack the sample so that it cannot be damaged in transport. Avoid using adhesive tape that adheres to the surfaces.

Contact person

Karin Hallstensson

Labingenjör

Read more about Karin

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