Vermiculite Coated Fiberglass:
FlameShield™ 1500 - Very High Temperature, Heat & Flame Resistant Thermal Insulating Braided Fiberglass Sleeve
This high temperature, heat and flame resistant thermal insulating vermiculite coated braided fiberglass sleeve will withstand temperatures of 1500°F / 815°C continuous exposure.  The base high temperature braided fiberglass sleeving is fabricated from high quality type E fiberglass that will not burn.  The sleeve is then coated with a vermiculite dispersant.

This material resists most acids and alkalis and is unaffected by most bleaches and solvents.  It is highly flexible and conformable.
Very High-Temperature Vermiculite
Coated Braided Fiberglass Sleeve
Applications for this product include thermal insulation, protection of wires, cables, hose, tube and pipe as well as affording personnel protection and energy savings.

The vermiculite coating also adds abrasion resistance to the sleeve.

Tested and certified to meet ASTM E 162, ASTM E 662 and SMP 800C.
very high temperature heat and flame resistant vermiculite coated fiberglass sleeve