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Spark Plug Boot, Fiberglass, 7.5", Nat

Item #: 299-FCN0.75-NT  MPN : FCN0-75-NT


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299-FCN0-75-NT - Fiberglass Spark Plug Boots, 7.5" Natural, 1,200°F

For decades, Techflex™ Insultherm braided fiberglass sleeving has been the first choice among automotive professionals and enthusiasts alike for many of their thermal protection applications.

These innovative sleeves offer the same high temperature protection in an easy slip on sleeve that will extend the life of expensive spark plug wires by protecting them where they need it most... at the boot. Just slip these 3/4" diameter double thickness (triple thick at the sewn end) sleeves over any spark plug cable and boot (even right angle boots) to protect them from engine temperatures up to 1,200°F. Once installed, the sleeves require no clearance from hot surfaces, and can even rest directly on hot exhaust headers without affecting performance.

Insultherm Spark Plug Boot Sleeves are completely non-conductive, resist all engine chemicals, will not support combustion, and provide an easy, economical solution to the challenge of wire protection in the cramped, high temperature environment of any high performance engine compartment.

Insultherm Spark Plug Boot Sleeves can rest directly on hot headers and other engine components without burning, melting or becoming brittle.


Physical Properties Hard Vacuum Data (ASTM E-595 at 10-5 torr)
Monofilament Thickness (ASTM D-204) TML .02
Flammability Rating VW-1 CVCM .01
Recommended Cutting Scissor WVR .00
Colors 4 Outgassing Low
Wall Thickness .085 Oxygen Index (ASTM D-2863)
Abrasion Resistance High Operating Temperatures
Specific Gravity 1.0 - 1.8 Minimum Continuous -94°F/-70°C
Moisture Absorption % (ASTM D-570) .01 Maximum Continuous (MIL-I-23053) 1,202°F/650°C
Melt (ASTM D-2117) 2.048°F/1,120°C
Chemical Resistance 1=No Effect 2=Little Effect 3=Affected 4=More Affected 5=Severely Affected
Aromatic Solvents 1 Alipahtic Solvents 1
Chlorinated Solvents 1 Weak Bases 1
Strong Bases 1 Salt Water (O-S-1926) 1
Hydraulic Fluid (MIL-H-5606) 1 Lubricating Oil (MIL-A-8243) 1
De-Icing Fluid (MIL-A-8243) 1 Strong Acids 2
Strong Oxidants 2 Esters/Keytones 1
UV Light 2 Petroleum 1
Fungus (ASTM G-21) 1 Salts 1
Halogen Free Yes RoHS Yes


Part #
Diameter Wall Thickness Bulk Box
No Ring-Easy Install
7 1/2"

Material: Fiberglass
Color: Natural / White
MPN - Manufacturer P/N: FCN0-75-NT
Size: 7.5