PROTECTING THE OPERATOR
Speltex-40 is the material used at this interface, protecting the operator from over blasting and keeping the blast medium and dust in the cabinet where it should be. It is also used to protect the inside of the cabinet from being blasted away. By suspending sheet Speltex-40 from the inside top of the cabinet the rubber absorbs the impact and protects the metal from being worn away.
So in shot blasting and finishing specify Speltex-40.