By the way, clear the pressure before publishing to make your saves a little cleaner. You can do this by pressing =.
Literally almost any element that is hard, destructible and non-conductive, such as CRMC. Or you can use WOOD - before the explosion, the bomb does not create enough heat to burn the wooden casing, but after the explosion, the wood will burn instantly, leaving no excess material and not preventing the remaining EXOT from reacting.
do you have any other items i can use for a replacement from iron?
I still strongly recommend against using IRON in EXOT bombs due to it absorbing electrons and thus reducing the bomb's efficiency. Also, you can use BCLN instead of CLNE to make your bomb "cleaner" and not leave a large chunk of indestructible material after it explodes. Also, since you're using clones anyway, you don't need that much ELEC, so you can just set the clones ctype to ELEC and replace all the ELEC with EXOT for more power.
By the way, clear the pressure before publishing to make your saves a little cleaner. You can do this by pressing =.
thank you