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Silicone can be formulated for a specific softness represented by its target Shore durometer rating—a standardized system of measurement for representing the specific hardness of rubbery materials.
Within the Shore system, the most common scales are Shore A for soft materials and Shore D for hard materials. For both scales the higher the rating number, the harder the material.
All major-brand masks we tested during development reported a semi-rigid Shore 50A-rating (akin to the pink eraser on a pencil) with the majority of those masks manufactured from oil-based thermoplastic elastomers instead of true silicone.
Below is a chart with some common items and their Shore ratings.
