Never saw this before. On the packaging of a roll of 3M Scotch Foam Mounting Tape there is a referral to Stampin' Up! On the paper backing for the roll there is a 'project artwork' by Stampin' Up pictured. The Stampin' Up website is given 'For more great crafting ideas'. Like I said never noticed this info before-just tore off the packaging and used it.it also states, 'Strong, Permanent Mounting'. See what useful info you get if you 'read' the information on the packaging!
I also have a BIG roll I bought from Staples using my rewards check. Since it was a huge roll and from an office supply store, never even thought about it being acid free. Thanks for the info.