Aluminum Roll Jacketing Siroc Aluminum Roll Jacketing is manufactured from alloys 3105 or 3003 under clients request alloy meeting ASTM B209 with an H-14 temper. The properties of these aluminum alloys provide the required strength to resist in-service abuse, but can be easily fabricated and installed. The attractive mill finish maintains its sharp appearance, a necessity for any insulation project. Aluminum's resistance to atmospheric corrosion makes its use ideal, even in marine, chemical, industrial environments, or in industries processing food or beverages. Aluminum's excellent resistance to corrosion reduces cost through long service without maintenance or painting.