The HVAC foil tape backing means the adhesive tape's carrier materials.
HVAC foil tape usually use a highly reflective Aluminum foil as the carrier. It coated with single faced adhesive and with release paper liner.
The thickness of Aluminum foil backing from 18um to 150um. But the actual common thickness is up to 50um. The thicker the aluminum foil is, the higher the tensile strength of the tape becomes.
But the thicker the foil, the more expensive it is. We usually use reinforced aluminum foil to increase its tensile strength but not much production costs.
Reinforced aluminum foil tape include FSK tape,Aluminum foil glass cloth tape,Foil scrim tape,PET laminated foil tape.
These products are reinforced to increase durability and ease of handling.
FSK is a laminated material by Aluminum foil, Scrim, Kraft.
Aluminum foil glass cloth also a laminated materials by Aluminum foil, fiberglass cloth.
HVAC foil tape can be combined with many types of insulation materials in reflective insulation systems. In these combinations, HVAC foil tape can act as the thermal insulation's facing material.