21 Substances which in contact Category 1 50kg or 50L 500kg or 4.3 (PG I) with water emit flammable gas 500L 22 Category 2 250kg or 2500kg or 4.3 (PG II) 250L 2500L 23 Category 3 1000kg or 10 000kg or 4.3 (PG III) 1000L 10 000L 24 Any combination of chemicals from Items 21 to 23 where 1000kg or 10 000kg or none of the items exceeds the quantities in columns 4 or 1000L 10 000L 5 on their own
21 Substances which in contact with water emit flammable gas Category 1 50kg or 50L 500kg or 500L 4.3 (PG I) 22 Category 2 250kg or 250L 2500kg or 2500L 4.3 (PG II) 23 Category 3 1000kg or 1000L 10 000kg or 10 000L 4.3 (PG III) 24 Any combination of chemicals from Items 21 to 23 where none of the items exceeds the quantities in columns 4 or 5 on their own 1000kg or 1000L 10 000kg or 10 000L