I’ve tried searching the information on the internet but it’s quite hard to specific which number of “shoreA hardness” is suitable, which means hard/stiff enough that the aluminium sleeve be able to slide in and soft enough to perfectly seal in the extrusion(irregular shape).
I think we should directly ask the supplier and just let them test and advise.
Please Note “ as from researching the EPDM gasket with 70 shore A hardness is my selection