Imploding is both a Property and Trait.
While under the effects of this Property, whenever you would achieve a Result on a Die equal to the maximum that die can roll, such as an 8 on a D8 or 4 on a D4, that Die is removed from your Dice Pool.
If a Dice Pool is under the effects of both the Imploding and Unreliable Properties, Imploding is resolved first, before Rerolling any Dice due to the Unreliable Property.