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NOTE: For more detailed product information, see the "Submittal Sheet" document.

*3/8" thick product construction does not include overlap tape. Hot melt adhesive on both seams is used for sealing purposes.


K-FLEX® INSUL-LOCK® DS (DoubleSeal) is a flexible closed-cell elastomeric insulation tube product used to conserve energy and prevent condensation on piping applications. It is pre-slit with a factory-applied pressure sensitive modified-acrylic adhesive with scrim reinforcement on the seam surface and a flexible PVC overlap tape with acrylic adhesive for doubled seam security. The system reduces installation time and costs, and ensures a strong, durable seal.

The product's closed-cell structure creates exceptional thermal properties (k-value of 0.245 at 75°F and wvt of 0.03 perm-in) that protect against moisture penetration in applications within a -40°F to +220°F temperature range.

K-FLEX® INSUL-LOCK® DS is widely used for its cold weather flexibility, durable skin surface, exacting manufacturing tolerances and lasting performance. It is available in 6’ lengths in wall thicknesses ranging from 3/8”* to 2”.

K-FLEX® INSUL-LOCK® DS is non-porous, non-fibrous and resists mold, fungal and bacterial growth. For added protection, it is protected with an EPA-approved antimicrobial agent.

K-FLEX® INSUL-LOCK® DS is GREENGUARD® certified under the Children and Schools classification, is approved through supervision by the Factory Mutual Research Corporation, and is 25/50-rated when tested to ASTM E 84 standards.

*3/8" thick product construction does not include overlap tape. Hot melt adhesive on both seams is used for sealing purposes.

  • Systems
    • Air conditioning
    • Cold water
    • Chilled water
    • Refrigeration
    • Duct wrap
    • Hot water
  • Projects
    • Commercial/multi-family housing
    • Hospitals
    • Hotels
    • Schools
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Manuals (1)

3/4" Pipe

Wall Thickness:






Length (Feet):


Operating Temp Range:

-40° to 200°F


3-6 PCF

Water Absorption:

0% by volume

Chemical/Solvent Resistance:


Mildew Resistance/Air Erosion:


Ozone Resistance:


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