[url=http://paizo.com/threads/rzs2nhop?Can-Alchemists-bombs-crit]Had to find it on forums to double check. Only first d6 and bonus crit.[/url]

For Sledge, pg. 72 of Ultimate Equipment:

This heavy, two-handed hammer is normally used in carpentry 
and other construction tasks, and is also useful for driving in 
tent stakes to help secure campsites in areas with strong winds. 
If used in combat, treat it as an improvised earth breaker (see 
page 27).