Shore hardness - how to interpret?

I'm looking at a data sheet for some polyurethane potting compound / encapsualtn.

It says its Shore A rating is 1:90 - 15:85

All the Shore durometer tables I see simply have a range of 0 to 95. Like this one:

Any ideas? Thanks

This is the data sheet:

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Apologies - I forgot to add the [OT], though its a little more on topic than a lot of the traffic lately!

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