Tephrex® Knitted Basalt Sleeves

Basalt Sleeves Provide Excellent Thermal Protection

Basalt sleeves are primarily used in high temperature pipe insulation applications. They are constructed of lightweight basalt fiber yarns knit into heavy-wall sleeves that offer enhanced heat resistance, thermal performance, and durability when compared to typical fiberglass sleeve products. Basalt fibers are made from volcanic rock, making them environmentally friendly, non-hazardous, and 100% recyclable. Recommended for a continuous operating temperature of 1382°F (750°C), our flexible basalt sleeves expand one and a half times their diameter for optimal coverage and easy installation around awkward shapes and tight bends and over fittings, couplings, and other obstructions.

Knitted Basalt Sleeves Are Easy to Install

These slip-on high temperature exhaust sleeves are resistant to most oils, fuels, acids, alkalis, and other fluids, and their dense, single-wall design minimizes snagging, eliminates fraying, and enables neat, easy field-cutting without specialized tools. When used as an exhaust heat shield in automotive applications, basalt sleeves can facilitate efficient vehicle emission control systems by retaining high temperatures as gases flow through the exhaust. Basalt sleeves can also be used to protect pipes, hoses, and cables from high temperatures.

Ask About Our Custom Solutions

We also offer a wide variety of cutting and stitching options including serge, lock, and chain, making Davlyn Group your one-stop shop for custom solutions.

Quick Reference


  • Basalt


  • Knitted

Recommended Operating Temperature

  • 1382°F (750°C)

Size Range

  • 1″ (25.4 mm) to 6″ (152.4 mm)


  • Aerospace
  • Automotive
  • Locomotive
  • Heavy Equipment
  • Heavy Truck
  • Power Generation
  • OEM


  • Engine Exhaust Systems
  • Exhaust Gas Recirculation (EGR) Tubes
  • Insulation & Heat Containment

Custom Options

  • Pre-Cut Lengths
  • Special Bulk Packaging


  • REACH Compliant
  • RoHS Compliant
  • ASTM G85-11
  • ASTM D-5132
  • SAE J369
  • ISO 3795
  • FMVSS 302
  • CMVSS 302
  • PSA D45 1333
  • Free of Chemicals Listed in California’s Safe Drinking Water & Toxic Enforcement Act of 1986 (Cal Prop 65)
  • Free of Conflict Materials
  • Free of Asbestos

Read Our Thermal Protection Product Guide

Need some help navigating your project needs and our technical textile solutions? Browse Davlyn Group’s guide for thermal protection solutions.