Armacell AP Self-Adhesive Sheet Insulation vs 4x4 Inch Adhesive Foam Padding

These are not really the same product. The Armacell AP sheet is a genuine elastomeric insulation panel for ducts, pipes and walls, with a published R-value of 4.2, a 25/50 flame and smoke rating, and a wide temperature range. The unbranded foam pads are small 4 x 4 inch closed-cell cushions for furniture, doors and vibration damping, sold as a set of four. Buy the Armacell for real thermal insulation on a large area; buy the pads for small gap-filling, cushioning and noise jobs.

• Choose the Armacell AP sheet if you are insulating a duct, wall or large flat surface and need rated thermal and fire performance across 144 square feet.
• Choose the unbranded foam pads if you need a few small adhesive cushions for furniture feet, door gaps, a 3D printer or vibration damping.