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Duct tape specimens

Pictured below is a diffractogram comparing the adhesive side of duct tape from different manufacturers. It is used as part of the material identification in forensic labs as every manufacturer uses a slightly different adhesive and a slightly different upper refractory surface with a different web support structure. An XRD scan of the upper surface, using Rigaku's MiniFlex benchtop diffractometer, combined with a scan of the adhesive side is sufficient to identify the duct tape to a specific manufacturer. Duct tape is one of the most common pieces of evidence left behind at crime scenes.

XRD of duct tape