Shredded Aluminum (Twitch) or Floated Fragmentizer Aluminum Scrap is derived from a wet or dry media separation device, the material must be dry and not contain more than 1% maximum free zinc, 1% maximum free magnesium, and 1% maximum of analytical iron. Not to contain more than a total 2% maximum of non-metallic, of which no more than 1% shall be rubber and plastics.