Armacell AP Self-Adhesive Sheet Insulation vs Armacell AF/ArmaFlex Self-Adhesive Sheet

These are the same sheet in different packaging: both are 36 x 48 inch, 1 inch thick Armacell elastomeric sheets with R4.2 and a -297 to 220°F range. The AP sheet is the plain self-adhesive product; the AF/ArmaFlex sheet adds published acoustic and moisture data and a fire class of B-s3,d0. Buy the AP sheet for straightforward duct and pipe wrap where you just need self-stick installation. Step up to the AF/ArmaFlex sheet if sound control, moisture resistance or documented fire performance matters. Owners of Armacell sheet generally report clean adhesion and easy cutting; the main complaint is that the adhesive grabs fast, so dry-fit before peeling.

• Choose the Armacell AP sheet if you want a plain self-adhesive 1 inch elastomeric sheet for duct, pipe or equipment wrap and do not need acoustic or fire-class documentation.
• Choose the AF/ArmaFlex sheet if you need published sound absorption, a moisture diffusion figure or a B-s3,d0 fire rating for the job.