Armacell Product Selector

AC AccoFlex

Tube Insulation

AC AccoFlex is the fiber-free, flexible, elastomeric pipe insulation for reliable protection against condensation, mold, energy loss and ultraviolet radiation in residential and commercial applications. AC AccoFlex is designed to meet the widest range of HVAC and refrigeration requirements in all climates.

The closed-cell nature of elastomeric foam insulation provides superior protection against thermal losses, condensation and moisture accumulation that leads to mold. It is the ideal choice for insulating mechanical piping systems.


The pipe insulation choice for the HVAC/R professional

Product Advantages

  • Closed-cell structure provides excellent condensation and energy-loss control

  • Effectively retards degradation due to ultraviolet (UV) radiation

  • Flexible material with dusted, relaxed ID’s for easy installation

  • Superior toughness to withstand on-site handling

  • Built-in vapor barrier eliminates need for additional vapor retarder

  • Complete size range for HVAC/R

Application Areas

  • Designed for use on air conditioning coil lines, indoors and out

  • Painting with WB Finish will minimize surface degradation due to prolonged UV radiation exposure


Black flexible elastomeric thermal pipe insulation


  • Wall Thickness (nominal): 3/8” 1/2”, 3/4” and 1” (10, 13, 19 and 25mm)

  • Inside Diameter, Tubular: 3/8”, ID to 4-1/8” ID (10mm ID to 105mm ID)

  • Length of Sections, Tubular: 6’ (1.83m)

Specifications Compliance:

  • ASTM C 534, Type I - Tubular Grade 1

Approvals, Certifications, Compliances:

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

  • All Armacell facilities in North America are ISO 9001 certified.

Outdoor Use:

No painting is necessary for performance of the product. However, all elastomeric-based cellular insulation will show surface defects after prolonged exposure to UV radiation. Painting with WB Finish will minimize these defects if installed outdoors.


Link to the AC AccoFlex Tolerances and R-values table here.

For complete Specification details, download the product submittal sheet.


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

  • ArmaFlex BLV – Black Low VOC Air-drying, solvent-based contact adhesive

  • ArmaFlex WB Finish – Latex-based, UV resistant protective coating for indoor or outdoor applications

  • ArmaFlex Insulation Tape – black foam, pressure-sensitive seam tape

  • Armacell Fabricated Fittings – Made to order pre-fabricated fittings in Tees, Elbows, P-Traps and more

  • ArmaFix EcoLight Insulation Pipe Hangers – Easy-to-use insulated pipe hanger supports that protect against compression, up to 2” wall thickness.

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, 2014-2022 • 55 Vilcom Center Drive • Suite 200  • Chapel Hill, NC 27514 • tel 800 866 5638 • email: