The Shore 00 Hardness Scale is the softest. It measures rubbers and gels that are very soft.
The Shore A Hardness Scale is measured based on ASTM D-2240 standards, ranges from extra soft to hard, measures flexible rubbers.
The Shore D Hardness Scale starts in the medium hard range and goes up to extra hard materials, measured based on ASTM D-2240 standards as well, typically for measuring hard rubbers, semi-rigid plastics and hard plastics.
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