ISO standards download ISO 247-1:2018 pdf download – Rubber — Determination of ash — Part 1: Combustion method ISO 247-1:2018 pdf download - Rubber — Determination of ash — Part 1: Combustion method. 8 Procedure 8.1 Method A Heat a clean empty crucible (6.1) of appropriate size for about 30 min in the muffle furnace... 02-20 Download Now