No idea mate, I wouldn't have fancied doing this job.Asbestos was removed from the product manufactured by the company using the name artex in 1984, I remember well how we moaned that the replacement product was inferior compared to the original. As for the other manufacturers, wondertex, suretex, clintex etc, they may well have continued to use asbestos up until 1999.
what about the people who mixed asbestos into the artex themselves?