aluminum tape: Aluminum backing provides excellent reflection of both heat and light. High quality adhesive with super strong adhesion and holding power offers reliable and durable Foil-Scrim-Kraft Facing joints and seams sealing in HVAC ductwork application, Low moisture vapor transmission rate makes BondTape AF1825 an excellent vapor barrier. Service Temperature range from -40° to +150°C (-40° to +302°F). TYPICAL PHYSICAL PROPERTIES: PROPERTIESMETRIC ENGLISHTEST METHODFoil Backing25 Micron1.1 MilPSTC-33Total Thickness (Foil + Adhesive)65 Micron2.5/ MilPSTC-33Peel Adhesion18 N/25mm65 Oz./In.PSTC-1Rolling Tack (11mm ball)£ 20 cm£ 8.0 In.PSTC-6Holding Power3,000+ Min.3,000+ Min.PSTC-7Service Temperature Ranger-40 +150 °C-40 +302 °F----------