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Old 7th September 2020
  #2
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Each tested product will have a Shore A hardness value but you may need to look up the more detailed product specifications on a web site rather than on the product in a shop.

I believe values from 25 to 35 fall in the range that acoustic caulks have. For example, I used Mapeflex PU45 which is working great for me. It has a Shore A hardness value of 38, so just outside the range on the stiffer side. It allows for up to 20% movement.