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Gray silicone-coated fiberglass insulated pipe jacket, 12 by 42 inches, 3 inch wall thickness

Unitherm

Unitherm IW4218 12 x 42 in Fiberglass Insulated Pipe Jacket 3 in Wall

SKU CH-NJAA-87GQA

Fiberglass insulated jacket fits straight pipe sections with 31 to 38 inch circumference and withstands 900 degrees F

  • ColorGray
  • TypePipes, Valves & Fittings
  • Withstands 900 °F ambient heat
  • Fits 31–38 in pipe circumferences
  • 3 in thick fiberglass mineral-wool insulation
  • Quick-release flap and wire-twist fastening
  • Silicone-coated fiberglass cloth jacket, R-0.48

Insulated Pipe Jacket for Industrial Piping

The Unitherm IW4218 is a fiberglass insulated pipe jacket designed for straight pipe sections in industrial environments. It uses silicone coated fiberglass cloth as the jacket material with fiberglass and mineral wool insulation. The cover measures 12 inches by 42 inches with a 3 inch thickness. It fits pipes with a circumference between 31 and 38 inches.

Maximum Ambient Temperature Rating 900 Degrees F

The single specification that decides suitability is the maximum ambient temperature rating of 900 degrees F. This defines the thermal limit for the insulation assembly in service. Buyers needing protection above this temperature must select a different product. The R value is 0.48 at this thickness.

Quick Release Fastening System for Installation

The jacket fastens with a quick release fabric flap and wiretwists. This system allows the jacket to be opened and closed without tools for inspection or maintenance. The gray color matches standard industrial coding. The product meets OSHA standards for workplace safety.

Highlights

  • Withstands 900 °F ambient heat
  • Fits 31–38 in pipe circumferences
  • 3 in thick fiberglass mineral-wool insulation
  • Quick-release flap and wire-twist fastening
  • Silicone-coated fiberglass cloth jacket, R-0.48

Specifications

BrandUNITHERM
ColorGray
TypePipes, Valves & Fittings

Questions about this item

What does the R-value of 0.48 mean for heat retention on a hot pipe?

The R-value of 0.48 indicates the thermal resistance of the 3 in thick fiberglass and mineral wool insulation, reducing heat loss from pipes operating up to 900 Degrees F.

How does the quick-release flap and wiretwist fastening work on site?

The silicone coated fiberglass cloth jacket wraps around the pipe and secures with a fabric flap and wiretwists, allowing tool-free installation and removal for maintenance on straight sections.

What pipe circumferences does the 12 x 42 in jacket accommodate?

The jacket fits straight pipe sections with a minimum circumference of 31 in and a maximum circumference of 38 in, covering a 42 in length.

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