The company that produces most of the billet material that a lot of the top Italian manufacturers is RSP Technologys based in the Netherlands. This is a technik that they developed them selves also quite expensive material compared with castings. This process involves a copper disc spinning and molten alloy being drizzled for want of a better word on to the disc and cooling at a phenominal rate, this produces a constant shard of cold alloy. The secret to this material is the rapid cooling. These shards are then chopped into small fragments and then compressed together at very high pressure as its forced through the relavent size die to form a bar. Material specs are
silicon iron+nicol copper thermal expantion
30% 2.7 1.5 14.8 i believe this best suited to AAC
30% 1.0 1.4 15.4
24% 1.0 1.4 16.8
21% 4.3 4.1 16.3 Regards Martin.