Ceramic sample preparation is a technique that involves the formation of a solid pellet of material for analysis through methods that require flat, round samples known as sample discs. The sample discs are either produced by fusion of the sample with salt or through pressing in a press and die. Molds control the size of the sample discs.
Sample discs can be used for X-ray fluorescence (XRF) analysis, infrared spectroscopy and optical emissions spectroscopy. XRF discs do not require a binder or holder if the sample coheres under pressure. The prime requirement for an XRF binder is that it does not contribute impurities.