BS ISO 20203:2005 pdf free.c- Calcined coke一Determination of crystallite size of cal lcined petrol leum coke by X-ray diffraction. BS ISO 20203 6.2.1 Back-fill technique Put the window on a glass slide (Slide 1) and transfer sufficient quantities of sample into the window. Work the sample towards the corners of the holder using a glass slide or spatula. Press down...