[Eric] started with an SLA-printed two-part mold and a silicone formulation with a Shore durometer of A 40 — this is the measure of hardness for silicone, polymers, and elastomers in the sense ...

The most popular durometers are the types A and D. Very soft materials are rated on the Shore OO scale. Rubber and polyurethane are rated on the Shore A scale and hard materials are rated on the Shore ...