ASTI-Tech F is a variant of ASTITech with a significantly stronger cell structure. This results in additional areas of application. ASTI-TECH 500 F is a heavy flexible foam with a density of 500 kg/m³ and a foaming factor of 2.2. ASTI-Tech 300 F is the medium-weight flexible foam with a density of 300 kg/m³ and a foaming factor of 3.7. With its solid cell structure, ASTI-Tech 500 F & 300 F are ideal for the production of made-to-measure shoe beds and individual upholstery. if it should be a little tighter. ASTI-Tech 150 F is the light soft foam with a density of approx. 185 kg/m³ and a foaming factor of approx. 6.0. For forefoot replacement. soft foam inserts. Made-to-measure shoe beds and individual upholster. if you want it to be a little tighter. As a B component for all ASTI-TECH settings, ASTI-TECH-B used.