84: Gost 23345

: Use a square piece of white paper (typically 15x15 cm or 21x21 cm).

: Covers binding materials on a paper base (used for book covers). GOST 3441-88 : For electrical insulating impregnated paper . GOST 8942-85 : For paper tape used in printing devices. gost 23345 84

If you meant a different GOST number or a specific type of paper-making process, please let me know! : Use a square piece of white paper