Armacell Product Selector

ArmaFlex Ultra Sheet and Roll

Regular or Self-Adhering Sheet/Roll

Armacell is constantly looking at ways to improve our products while making safety a top priority. Our new ArmaFlex® Ultra with FlameDefense™ technology resists burning and reduces smoke development. It is this commitment that elevated ArmaFlex Ultra to become the first elastomeric insulation Classified by UL to UL 723 at 25/50. R39561

When you specify ArmaFlex Ultra you know you are meeting the current IMC building codes which require that mechanical insulation products used in an air plenum be "listed and labeled" as achieving specific flame and smoke ratings, and that these ratings be regularly certified by a third party lab. That’s your guarantee that ArmaFlex Ultra is a safer elastomeric insulation material today and tomorrow.


Regular or Self-Adhering Sheet/Roll Insulation Classified by UL to UL 723 at 25/50. R39561

Product Advantages

  • First elastomeric insulation Classified by UL to UL 723 at 25/50 rating

  • Protection against thermal losses, condensation and moisture ingress

  • Meets code requirements for installation in plenums

  • Low water vapor permeability

  • Available with and without self-adhering backer

Application Areas

  • Refrigeration lines, line sets, chilled water pipes, hot and cold water piping

  • HVAC systems, VRV and VRF systems, ducts

  • Exposed ceilings and air plenums

  • Commercial, mechanical, industrial, construction

  • OEM transportation and equipment




Gray, flexible, closed-cell elastomeric thermal insulation in sheet/roll format. Available with and without a self-adhering backing.

Specification Compliance

  • ASTM C 534, Type II — Sheet Grade 1

  • ASTM D 1056, 2C1

  • ASTM E 84, UL723

  • Manufactured without CFCs, HFCs, HCFCs, PBDEs, or Formaldehyde.

  • ASTM C1338

  • NFPA 90A, 90B

  • Conforms to ASHRAE 90.1 and IECC energy code requirements

  • Complies with Toxic Gas Generation by Materials on Combustion Boeing Aircraft Standard BSS 7239.

  • All Armacell facilities in North America are ISO 9001 certified


  • Sheet: [width x length] 36" x 48" (.915 m x 1.22 m)

  • ½”, 1” (13mm, 25mm) Nominal Thickness

  • Roll: 48" wide (1.22 m)

  • Thickness (nominal) x Length: 1" x 35' (25 mm x 10.7 m); 1/2" x 70' (13 mm x 21.4 m)

For complete Specification details, download the product submittal sheet.


  • ArmaFlex 520– Air-drying, solvent-based contact adhesive for strong bonds and tight seams.

Armacell Manufacturing Locations

Did you know?

Armacell has 5 manufacturing facilities in the US and 1 in Canada. That means almost any product you order in North America is made in North America. Some exceptions apply.

Made In USA

© Armacell, 2014-2023 • 55 Vilcom Center Drive • Suite 200  • Chapel Hill, NC 27514 • tel 800 866 5638