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Black flexible foam 90-degree elbow pipe insulation, unslit, closed-cell Buna-N rubber PVC blend

Nomaco Kflex

Nomaco Kflex Pipe Fitting Insulation 801-LRE-068118

SKU CH-3C2F-Q6QQY

Buna-N rubber/PVC elbow insulation for 3/4 in pipe, unslit 90-degree form, plenum-rated with antimicrobial and flame-retardant properties

  • TypeTarps
  • Insulates pipes down to −297 °F with Buna-N rubber/PVC foam
  • Handles continuous heat up to 220 °F without degradation
  • Closed-cell structure delivers R-5.5 thermal resistance per inch
  • Plenum-rated with flame-spread index of 25 for code compliance
  • Antimicrobial, fire-retardant formula resists mould and flame spread

Pipe Fitting Insulation 90° Elbow

This 90-degree elbow fitting insulation is made from Buna-N rubber and PVC with a closed-cell foam structure. It fits pipe sizes of 3/4 inch and accommodates a tube outside diameter of 1 1/8 inch. The unslit design requires cutting during installation. It is rated for plenum use and offers antimicrobial and flame-retardant properties.

Sustained Temperature Range -297°F to 220°F

The insulation maintains its thermal performance continuously between -297 degrees F and 220 degrees F. Its R-value of 5.5 remains stable across this range without degradation from short-term peaks. The closed-cell foam resists moisture absorption that could reduce effectiveness over time. Flexible construction allows the material to endure thermal cycling without cracking.

Flame Spread Index 25 Plenum Rating

A flame spread index of 25 meets standard building code requirements for plenum-rated installations. The material self-extinguishes and limits flame propagation along pipe runs. Antimicrobial treatment inhibits mould growth inside the foam cells. These combined ratings define the practical limits for use in air-handling spaces.

Highlights

  • Insulates pipes down to −297 °F with Buna-N rubber/PVC foam
  • Handles continuous heat up to 220 °F without degradation
  • Closed-cell structure delivers R-5.5 thermal resistance per inch
  • Plenum-rated with flame-spread index of 25 for code compliance
  • Antimicrobial, fire-retardant formula resists mould and flame spread

Specifications

BrandK-FLEX USA
TypeTarps

Questions about this item

Will the 220 °F maximum operating temperature cause the insulation to soften or off-gas when the pipe runs hot all day?

The closed-cell Buna-N/PVC foam is rated to 220 °F continuous, so it remains stable and does not soften or release vapour under normal hot-water or steam service.

What pipe size and fitting type must already be in place for this 90-degree elbow to fit?

It is made for ¾ in pipe with a 1 ⅛ in tube outside diameter and an unslit 90-degree elbow form, so the matching copper or steel elbow must already be installed.

Can this plenum-rated, flame-spread-25 insulation be used next to older fibrous wrap without creating a fire-risk transition?

Yes — the plenum rating and 25 flame-spread index meet code for exposed ducts, and the flexible closed-cell rubber/PVC bonds cleanly to existing wrap with compatible adhesive.

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