We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Gray fiberglass insulated pipe jacket 12 by 42 inches 3 inch wall

Unitherm

Unitherm IW4206 12" x 42" Fiberglass Insulated Pipe Jacket 3" Wall bathware

SKU CH-TSMH-NHY21

Fiberglass insulated pipe jacket fits straight sections up to 42 in long and 38 in circumference, withstanding 900 °F and secured by quick-release flaps

  • ColorGray
  • TypePipes, Valves & Fittings
  • Fits pipes up to 38 in circumference
  • Withstands 900 °F continuous ambient temperature
  • Silicone-coated fiberglass cloth resists moisture and abrasion
  • Quick-release flap and wire twists speed installation
  • R-0.48 fiberglass and mineral wool core reduces heat loss

Industrial pipe insulation jacket

The Unitherm IW4206 is a silicone-coated fiberglass jacket designed for straight pipe sections in industrial settings. It fits circumferences between 31 and 38 inches with a 42-inch length and three-inch thickness. Maintenance teams use it to protect personnel and conserve energy on high-temperature lines.

Replacing damaged or missing wrap

This jacket replaces deteriorated insulation on existing pipe runs where a removable cover is preferred over permanent lagging. The quick-release fabric flap and wiretwists allow fast access for inspection or repair without cutting the material. The upgrade is worth it when operating temperatures approach the 900-degree Fahrenheit limit and OSHA compliance is required.

Limits of the silicone-coated fiberglass system

The R-value of 0.48 provides modest thermal resistance suitable for personnel protection rather than process control. The cover width of six inches and fixed 42-inch length restrict use to standard straight sections within the stated circumference range. Buyers needing continuous coverage on larger diameters or higher insulation values cannot meet those needs with this model.

Highlights

  • Fits pipes up to 38 in circumference
  • Withstands 900 °F continuous ambient temperature
  • Silicone-coated fiberglass cloth resists moisture and abrasion
  • Quick-release flap and wire twists speed installation
  • R-0.48 fiberglass and mineral wool core reduces heat loss

Specifications

BrandUNITHERM
ColorGray
TypePipes, Valves & Fittings

Questions about this item

What pipe circumference range does the 12" x 42" jacket with 3" wall fit?

It fits straight pipe sections with a circumference between 31 in and 38 in.

How do the quick-release fabric flap and wiretwists fasten, and what step is often missed?

Wrap the jacket around the pipe, engage the fabric flap, then tighten both wiretwists; skipping the second twist leaves the jacket loose.

When should the silicone-coated fiberglass cloth facing be inspected or replaced?

Inspect the facing after any exposure above 900 °F or if the cloth tears, because damage reduces the R-0.48 thermal barrier.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.