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The fibers aren't that big an issue. If you want better heat tolerant fibers you can use basalt fiber.

The problem is the matrix, which softens under heat unless you use exotic things like ceramic matrix composites which are brittle.

Some casual googling earlier suggests to me that fiberglass ladders are fiberglass/polyester, not fiberglass/epoxy.

> This is actually a great case where asbestos shines.

Asbestos is heavy as rock.

Asbestos is rock.

And rock is as heavy as rock.