From Halopedia, the Halo wiki

ComL is a type of high explosive mixture used by the United Nations Space Command in the M9 High-Explosive Dual-Purpose Grenade. It is a generally stable mixture which is extremely destructive when primed and detonated.[1] Only 0.19 kg of ComL is used in one grenade. ComL is relatively inexpensive to use and is effective at propelling the shrapnel from the grenade.[2]

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