How to choose suitable hardness of silicone for mold making？

For same casting materials, the hardness of silicone depends on the size and patterns.

-For a block &Cavity moulds

Shore A 5 and 10 for size 10-20 cm with small and fine patterns

Shore A 10 and 15 for size 20-30 cm with fine patterns

Shore A 20 and 25 for size 30-60 cm

Shore A 30 and 35 for size 60-90 cm with sample patterns

Shore A 40 for size more than 90cm

-For brush-on applications, our best-seller is Shore A 28