Rubber blooming refers to the phenomenon, when the liquid or solid compounding agent is moved out from the inside of the rubber and gets settled on the outer surface of the rubber causing a white powder-like layer on the outer surface of the rubber.
It is a superficial phenomenon, which means it does not affect the physical properties of rubber. However, in order to make the product look good, the rubber industry tries to avoid rubber blooming.
Causes of rubber blooming
Uneven mixing results in poor dispersion
Too high temperature of the rubber compound
The vulcanization temperature is too high or too low
Different manufacturing method is used
Poor quality of raw materials.