[VAC] Re: Polishing - .05 inches of Alclad ?

[Robert Gill]

OK.Here's the skinny on ALCLAD. You may encounter the terms "ALCLAD" and "Pureclad". Both terms designate metal sheets that have an aluminum core coated with a layer of pure aluminum on one or both sides. The thickness of the coating depends on the thickness of the sheet. The nominal Alclad thickness is 4% of the complete thickness for material under 0.063 of an inch; 2.5% for material in the range of 0.063 to 0.187 inch and 1.5 percent for material 0.188 inch and thicker. As for the T3 (temper disgnator) it means the material was solution heat treated then cold-worked. T6 means it was Solution heat treated and then artifically aged. T4 - Solution heat treated T5 - Artifically aged only. T3/T6 are most used.   Robert Gill Valdosta,Ga   ----- Original Message ----- From: [EMAIL PROTECTED] Sent: Saturday, February 24, 2001 7:30 PM To: Multiple recipients of VACList Subject: [VAC] Re: Polishing - .05 inches of Alclad ? The cladding on Aluminum has always been something of a mystery.  It was on the 2024 T3, and on other aluminum used on Airstreams.  RJ, has spoken about it and others have kicked the subject around, but we have not had an "expert" talk about how Kaiser, or Reynods, or Alcoa applied the cladding.  Some have said it is  several hundreds thick, and some have said it is several thousands thick.  Is it pure aluminum?  Is it applied by electrolisis?   Is it much more expensive?  I've heard it referred to as alcad, and alclad.   What is it exactly, and who is the expert that will finally shed some light on this subject.  Of the over 300 members on this list, we should have some good aviation types that know. Anybody???? Bill Scott Charter Member and Membership Chairman Washington DC Unit,  WBCCI   #3221 Our Homepage;  http://www.servintfree.net/wbcci-dc/ Get your FREE download of MSN Explorer at http://explorer.msn.com