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Black flexible foam tube pipe insulation 6 ft length 3/4 in wall thickness

K-Flex Usa

K-Flex Usa 6RX068278 Pipe Insulation 6 ft NBR/PVC 3/4 in

SKU CH-4PDR-4WEAF

Closed-cell NBR/PVC elastomeric tube insulates 2 7/8 in. pipe with R-4.3, rated -297 to 220 °F and plenum-safe

  • Flame spread index 41 meets strict fire codes
  • Smoke developed index 66 limits toxic emissions
  • R-value 4.3 reduces thermal loss
  • Operates from -297 °F to 220 °F
  • Plenum rated for air-handling spaces

K-Flex USA Pipe Insulation for 2 1/2 Inch Pipe

This closed-cell elastomeric tube is made from Buna-N rubber and PVC. It arrives in a six-foot length with a 3/4 inch wall and an unslit installation style. The product suits mechanical contractors and facility managers who need flexible thermal protection for piping systems. Plenum-rated construction allows use in air-handling spaces.

Inside Diameter Matches 2 7/8 Inch Tube Outside

The insulation is sized for pipe with a 2 7/8 inch outside diameter, which corresponds to a 2 1/2 inch nominal pipe size. Selecting the correct inside diameter is the single specification that determines fit; an undersized tube will not seat properly and an oversized tube leaves gaps. Verify the pipe OD before ordering.

R-Value 4.3 Handles -297 to 220 Degrees F

The material provides an R-value of 4.3 across a continuous service range from minus 297 degrees F to 220 degrees F. It comfortably handles chilled-water, refrigerant and hot-water lines within that span. The foam cell structure resists moisture ingress, while the flame spread index of 41 and smoke developed index of 66 meet typical plenum requirements. Outside this temperature window the insulation loses effectiveness.

Highlights

  • Flame spread index 41 meets strict fire codes
  • Smoke developed index 66 limits toxic emissions
  • R-value 4.3 reduces thermal loss
  • Operates from -297 °F to 220 °F
  • Plenum rated for air-handling spaces

Specifications

BrandK-FLEX USA

Questions about this item

What does an R-value of 4.3 mean for thermal performance on a 2-1/2 inch pipe?

An R-value of 4.3 indicates the insulation's resistance to heat flow; on a 2-1/2 inch pipe with 3/4 inch wall thickness, it reduces energy loss and controls condensation across the rated temperature range.

What does the plenum rating allow for this insulation?

The plenum rating means this NBR/PVC tube meets flame spread index 41 and smoke developed index 66 requirements for installation in air-handling spaces per building codes.

How much clearance does the 3/4 inch wall thickness add to the pipe diameter?

The 3/4 inch wall adds 1-1/2 inches to the overall outside diameter, so a 2-7/8 inch pipe becomes approximately 4-3/8 inches outside the insulation.

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