What is the effect of air bubbles in the mixture of plaster?

The presence of air bubbles in a plaster mixture significantly affects its strength. When air bubbles are introduced during mixing, they create voids within the set plaster. These voids reduce the overall density and structural integrity of the material. Consequently, the plaster may become weaker and more susceptible to fractures or damage under stress. This reduction in strength makes it crucial to minimize air entrapment during mixing, ensuring a more uniform and robust final product.

Fluidity, setting time, and consistency can also be influenced by the mixing technique and the plaster formulation, but the most notable impact relates specifically to the strength of the plaster due to the formation of those air pockets.