It would be too heavy for a solar balloon, and also very expensive. HDPE is about only 20 to 30 grams/m², and when it is degraded by the sun (after 200 or 300 hrs of use) the user is tired far before.
The xf-film (cross layers film) https://www.arktarps.com.au/product/lightweight-tarp/ used for tarps is very strong and have a high lifetime (I tested it outdoor for more than two years), but it weight (70 grams/m²) would be possible if the balloon is large enough.
Beside it I wonder if this xf-film could be used for low technology AWES thanks to its high lifetime compared to some months for fabric kites, that in spite of its low dimensional qualities.
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