Thanks for the link, Pud.
I am concerned with the cement. I have posted a comment on the web site that you linked.
The last comment was a year ago.
I'll let you know if I get a useful response.
Yours
Bill
Bill
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"Why not the best?"
Jimmy Carter
ESC depends on the applied or moulded-in stresses which exist. The extrusion process leaves no residual stress so no ESC. The test described in the link was a bit 'unreal world' type.