SPEX SamplePrep Spec-Caps are shallow, thin-walled aluminum cups which are routinely used in the production of pressed-powder sample discs for XRF. The Spec-Cap forms the bottom and partial sides of the completed sample disc (also called pellet, briquette, or planchet). Thus reinforced, the discs are resistant to chipping and breaking and are more easily handled, marked and stored than unclad discs.

The sample holders of most X-ray spectrometers will accept 31mm (11/4") sample discs. For these instruments, 3619 and 3619A Spec-Caps are ideal. Several spectrometer manufacturers have shifted toward 35 mm and 40 mm sample discs, and for these larger sizes we recommend 3615 and 3617 Spec-Caps, respectively.