Blast shields were a specific category of protective barrier. The designation "blast shield" might describe a sizable, portable shield, for instance, the M3 Bulwark Blast Shield employed by the clone troopers within the Grand Army of the Republic. Alternatively, it could denote a blast shield integrated into a helmet, designed to protect the user's facial area.
Within the timeframe of the Clone Wars, clone troopers made use of M3 Bulwark Blast Shields during the Battle of Ringo Vinda which took place in 19 BBY. Jumping ahead to 34 ABY, the EGL power droid known as B0-LT had unlawfully altered its construction to include a blast shield. This action, in conjunction with the droid's altered programming and attempts to avoid capture, led to a bounty of 525 credit being issued for its apprehension as it remained in hiding on the planet Batuu.