Peppy has started to answer my question, but it seems the SLD website has been updated (or I haven't read everything the first time !) :
"Weight will vary depending on options chosen, but average weight for standard length Argon 90 is 16 oz in the Apex 3.6 oz Insulation, 19.5 oz in the 5.0, 22 oz in the 6.0, 25 oz in the 7.5 and 30 oz in 10.0"
This is very interesting : not so heavy, actually.
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