Techflex Insultherm Fiberglass Header Wrap, 1” x 100 ft, Natural
Quick Overview
- Techflex Insultherm Header Wrap, 1" x 100 ft, Natural
- Fiberglass, rated 1,200 degrees F (649 C) continuous
- Keeps exhaust heat in the pipe and out of the engine bay
- Cuts with scissors; secure with stainless ties or clamps
- Wrap length guide and V8 example on this page
Show More
Item #: 299-HFN1.00NT
MPN : HFN1.00-NT
$47.25
per 100 Feet (USD)
In Stock & Ready to Ship
Techflex Insultherm Header Wrap, 1" x 100 ft, Natural
Exhaust and header insulation rated to 1,200°F (649°C): keeps heat in the pipe and out of the engine bay.
Techflex Insultherm Header Wrap is woven texturized fiberglass, vermiculite coated tape, 1" wide on a 100 ft roll. Wrapped onto headers with a 1/4" overlap, it holds exhaust heat inside the pipe, lowering under-hood temperatures and protecting nearby wiring, hoses and the starter. Use the wrap length guide below to work out how much you need, and the chart to compare widths, materials and roll sizes.
Key features
- Rated to 1,200°F (649°C) continuous.
- Material: Texturized fiberglass, vermiculite coated. The everyday choice for street and strip headers.
- 1" wide, 1/16" thick, 100 ft roll.
- Non-flammable; unaffected by fuel, oil and road salt.
- Cuts with scissors; secure with stainless ties or hose clamps.
Header wrap chart: every material, width and roll
| Part | Wrap | Material | Rated to | Width | Colour | Roll |
|---|---|---|---|---|---|---|
| 299-HFN1.00BK25 | Insultherm Header Wrap | Fiberglass | 1,200°F | 1" | Black | 25 ft |
| 299-HFN1.00BK50 | Insultherm Header Wrap | Fiberglass | 1,200°F | 1" | Black | 50 ft |
| 299-HFN1.00BK | Insultherm Header Wrap | Fiberglass | 1,200°F | 1" | Black | 100 ft |
| 299-HFN1.00NT25 | Insultherm Header Wrap | Fiberglass | 1,200°F | 1" | Natural | 25 ft |
| 299-HFN1.00NT50 | Insultherm Header Wrap | Fiberglass | 1,200°F | 1" | Natural | 50 ft |
| 299-HFN1.00NT | Insultherm Header Wrap | Fiberglass | 1,200°F | 1" | Natural | 100 ft |
| 299-HFN2.00BK25 | Insultherm Header Wrap | Fiberglass | 1,200°F | 2" | Black | 25 ft |
| 299-HFN2.00BK50 | Insultherm Header Wrap | Fiberglass | 1,200°F | 2" | Black | 50 ft |
| 299-HFN2.00BK | Insultherm Header Wrap | Fiberglass | 1,200°F | 2" | Black | 100 ft |
| 299-HFN2.00NT | Insultherm Header Wrap | Fiberglass | 1,200°F | 2" | Natural | 100 ft |
| 299-HSN1.00NT25 | Insultherm Header Wrap SI | Silica | 2,000°F | 1" | Natural | 25 ft |
| 299-HSN1.00NT50 | Insultherm Header Wrap SI | Silica | 2,000°F | 1" | Natural | 50 ft |
| 299-HSN1.00NT | Insultherm Header Wrap SI | Silica | 2,000°F | 1" | Natural | 100 ft |
| 299-HSN2.00NT25 | Insultherm Header Wrap SI | Silica | 2,000°F | 2" | Natural | 25 ft |
| 299-HSN2.00NT50 | Insultherm Header Wrap SI | Silica | 2,000°F | 2" | Natural | 50 ft |
| 299-HSN2.00NT | Insultherm Header Wrap SI | Silica | 2,000°F | 2" | Natural | 100 ft |
| 299-VWN1.00BA25 | Volcano Wrap | Basalt | 1,300°F | 1" | Basalt (bronze) | 25 ft |
| 299-VWN1.00BA50 | Volcano Wrap | Basalt | 1,300°F | 1" | Basalt (bronze) | 50 ft |
| 299-VWN1.00BA | Volcano Wrap | Basalt | 1,300°F | 1" | Basalt (bronze) | 100 ft |
| 299-VWN2.00BA25 | Volcano Wrap | Basalt | 1,300°F | 2" | Basalt (bronze) | 25 ft |
| 299-VWN2.00BA50 | Volcano Wrap | Basalt | 1,300°F | 2" | Basalt (bronze) | 50 ft |
| 299-VWN2.00BA | Volcano Wrap | Basalt | 1,300°F | 2" | Basalt (bronze) | 100 ft |
Equivalents: other brands' header wrap
Shopping for another brand? Each row is the same material, width and roll length.
| Our part | Instead of (brand) | Their part number | Description | Match |
|---|---|---|---|---|
| 299-HFN1.00BK25 | Heatshield Products | 321025 | Black Exhaust Wrap 1" x 25 ft | Same spec |
| 299-HFN1.00BK50 | DEI | 010107 | Exhaust Wrap 1" x 50 ft, black | Same spec |
| 299-HFN1.00BK50 | Heatshield Products | 321050 | Black Exhaust Wrap 1" x 50 ft | Same spec |
| 299-HFN1.00BK50 | Thermo-Tec | 11021 | Exhaust Wrap 1" x 50 ft, black | Near equivalent |
| 299-HFN1.00BK | DEI | 010118 | Exhaust Wrap 1" x 100 ft, black | Same spec |
| 299-HFN1.00NT25 | Heatshield Products | 311025 | Exhaust Wrap 1" x 25 ft, natural | Same spec |
| 299-HFN1.00NT50 | DEI | 010101 | Exhaust Wrap 1" x 50 ft, tan | Same spec |
| 299-HFN1.00NT50 | Heatshield Products | 311050 | Exhaust Wrap 1" x 50 ft, natural | Same spec |
| 299-HFN1.00NT50 | Thermo-Tec | 11001 | Exhaust Wrap 1" x 50 ft, natural | Near equivalent |
| 299-HFN1.00NT | DEI | 010117 | Exhaust Wrap 1" x 100 ft, tan | Same spec |
| 299-HFN2.00BK25 | DEI | 010099 | Exhaust Wrap 2" x 25 ft, black | Same spec |
| 299-HFN2.00BK25 | Heatshield Products | 322025 | Black Exhaust Wrap 2" x 25 ft | Same spec |
| 299-HFN2.00BK50 | DEI | 010108 | Exhaust Wrap 2" x 50 ft, black | Same spec |
| 299-HFN2.00BK50 | Heatshield Products | 322050 | Black Exhaust Wrap 2" x 50 ft | Same spec |
| 299-HFN2.00BK50 | Thermo-Tec | 11022 | Exhaust Wrap 2" x 50 ft, black | Near equivalent |
| 299-HFN2.00BK | DEI | 010116 | Exhaust Wrap 2" x 100 ft, black | Same spec |
| 299-HFN2.00BK | Heatshield Products | 322100 | Black Exhaust Wrap 2" x 100 ft | Same spec |
| 299-HFN2.00BK | Thermo-Tec | 11023 | Exhaust Wrap 2" x 100 ft, black | Near equivalent |
| 299-HFN2.00NT | DEI | 010103 | Exhaust Wrap 2" x 100 ft, tan | Same spec |
| 299-HFN2.00NT | Heatshield Products | 312100 | Exhaust Wrap 2" x 100 ft, natural | Same spec |
| 299-HFN2.00NT | Thermo-Tec | 11003 | Exhaust Wrap 2" x 100 ft, natural | Near equivalent |
| 299-HSN1.00NT25 | Heatshield Products | 325001 | Inferno Header Wrap 1" x 25 ft | Same spec |
| 299-HSN1.00NT50 | Heatshield Products | 325002 | Inferno Header Wrap 1" x 50 ft | Same spec |
| 299-HSN2.00NT25 | Heatshield Products | 325025 | Inferno Header Wrap 2" x 25 ft | Same spec |
| 299-HSN2.00NT50 | Heatshield Products | 325050 | Inferno Header Wrap 2" x 50 ft | Same spec |
| 299-HSN2.00NT | Heatshield Products | 325100 | Inferno Header Wrap 2" x 100 ft | Same spec |
| 299-VWN1.00BA25 | Heatshield Products | 371025 | Lava Exhaust Wrap 1" x 25 ft | Same spec |
| 299-VWN1.00BA50 | Heatshield Products | 371050 | Lava Exhaust Wrap 1" x 50 ft | Same spec |
| 299-VWN1.00BA50 | DEI | 010126 | Titanium Exhaust Wrap 1" x 50 ft | Near equivalent |
| 299-VWN2.00BA25 | Heatshield Products | 372025 | Lava Exhaust Wrap 2" x 25 ft | Same spec |
| 299-VWN2.00BA25 | DEI | 010131 | Titanium Exhaust Wrap 2" x 25 ft | Near equivalent |
| 299-VWN2.00BA50 | Heatshield Products | 372050 | Lava Exhaust Wrap 2" x 50 ft | Same spec |
| 299-VWN2.00BA50 | DEI | 010127 | Titanium Exhaust Wrap 2" x 50 ft | Near equivalent |
| 299-VWN2.00BA | Heatshield Products | 372100 | Lava Exhaust Wrap 2" x 100 ft | Same spec |
| 299-VWN2.00BA | DEI | 010130 | Titanium Exhaust Wrap 2" x 100 ft | Near equivalent |
Other brands' names and part numbers are their owners' trademarks, listed only to help you compare. Check sizes against your application.
How much wrap do I need?
Inches of wrap per foot of pipe, with a 1/4" overlap. Add 8" for each bend, or 14" for a bend tighter than 90°. Use 1" wrap on small primaries (it lies flatter round the bends) and 2" wrap on pipe 2-1/2" and larger.
| Pipe OD | 1" wrap per foot | 2" wrap per foot | Width to use |
|---|---|---|---|
| 1-3/8" | 70" | 30" | 2" wrap not recommended |
| 1-1/2" | 76" | 33" | 1" or 2" |
| 1-5/8" | 82" | 35" | 1" or 2" |
| 1-3/4" | 88" | 38" | 1" or 2" |
| 1-7/8" | 95" | 41" | 1" or 2" |
| 2" | 101" | 44" | 1" or 2" |
| 2-1/4" | 114" | 49" | 1" or 2" |
| 2-1/2" | 126" | 54" | Use 2" wrap |
| 2-3/4" | 139" | 60" | Use 2" wrap |
| 3" | 151" | 65" | Use 2" wrap |
| 3-1/4" | 164" | 70" | Use 2" wrap |
| 3-1/2" | 176" | 76" | Use 2" wrap |
| 3-3/4" | 189" | 81" | Use 2" wrap |
| 4" | 201" | 87" | Use 2" wrap |
Worked example
A V8 with 1-3/4" primaries, each about 30" long with two bends: 2.5 ft x 38" + 2 x 8" = 111" of 2" wrap per primary, about 9.3 ft. Eight primaries take about 74 ft, plus the collectors: two 50 ft rolls of 2" wrap.
Installing header wrap
- Wear safety glasses, gloves, a dust mask and long sleeves.
- Soak the wrap in a bucket of water. Wet wrap is more flexible, goes on tighter and makes less dust.
- Start at the exhaust port and secure the first turn with a stainless tie or hose clamp.
- Wrap with a 1/4" overlap, keeping tension and tightening every two or three turns. More overlap is not better: it traps too much heat in the pipe.
- Where primaries run too close to wrap singly, wrap them together.
- Finish at the collector and secure the end with a tie or clamp.
Some smoke on the first runs is normal while the coating cures.
Which heat protection do I need?
Heat reaches a hose or wire in three ways, and each needs a different kind of protection.
- Radiant heat. A header or turbo throws heat out in every direction, like a stove element, and it reaches anything in line of sight. Reflective foil stops it best: the aluminized face bounces it back before it gets in.
- Heat soak. Hot air and nearby hot parts warm a line slowly and steadily. Insulation stops it. Braided fiberglass traps thousands of tiny pockets of still air, the same way the insulation in a house wall does, and still air carries heat very poorly. Squash the fiberglass and the air goes, and most of the insulation with it.
- Flame, sparks and splash. A burst line, a backfire or weld spatter. This needs a covering that will not burn: a silicone jacket or a non-flammable fibre.
Foil-over-fiberglass products combine the first two: the foil reflects, the fiberglass insulates. Nothing should rest against a bare header; wrap the header, shield the line, or both.
| Situation | Use | Why it works |
|---|---|---|
| The exhaust itself: headers, down pipes, turbo crossovers | Header wrap | Keeps the heat inside the pipe, so far less of it radiates onto the hoses, wiring and bodywork around it. The best fix is usually at the source. |
| A hose or harness close to a header or turbo (strong radiant heat) | T6 ThermaShield split tube or ThermaShield Convoluted | The aluminized face reflects most of the radiant heat before it gets in, and the fiberglass behind it insulates against what does get through. |
| A firewall, floor pan, fuel cell or ECU box facing the exhaust | ThermaShield Flat or ThermaShield Wrap | The same foil over fiberglass, as a sheet that sticks on or wraps around odd shapes. |
| Lines in a hot engine bay: steady heat soak, little direct radiant heat | FireFlex fire sleeve | A thick layer of fiberglass holds still air, which insulates; the silicone jacket seals out oil, fuel and splash. Leave at least 1/8" of air gap so the fiberglass is never squashed. |
| Single wires, sensor and thermocouple leads near heat | Insultherm Tru-Fit fiberglass sleeving | A thin fiberglass braid that insulates without adding bulk. |
| Plug wire boots close to the headers | Insultherm spark plug boot sleeves | Double-thick fiberglass where the boot sits closest to the pipe. |
| Flame, sparks, weld spatter or molten splash | Dragon Sleeve, or FireFlex if the line also needs insulating | Dragon fibre will not burn and shrugs off sparks, but its thin wall holds little air, so it does not insulate much. FireFlex resists splash and insulates. |
All the lines compared:
| Product | What it is | Heat it handles | Continuous rating | How it fits | Best for |
|---|---|---|---|---|---|
| Techflex FireFlex fire sleeve | Thick fiberglass braid with a silicone jacket | Direct heat, open flame, oil and fuel splash | 500°F (260°C) | Slides on before the hose ends go on | Fuel, oil, brake and clutch lines near headers or turbos |
| Techflex T6 ThermaShield split tube | Aluminized fiberglass tube, split, closes with an adhesive strip | Reflects radiant heat | 491°F (255°C) material; reflects radiant heat from a 1,400°F source at 3/8" | Wraps around: no need to remove fittings | Assembled hoses and harnesses near exhaust |
| Techflex ThermaShield Convoluted | Seamless aluminized fiberglass, flexible convoluted tube | Reflects radiant heat | Not published | Slides on | Hoses and wires that bend in several directions |
| Techflex ThermaShield Flat (full adhesive) | Flat aluminized fiberglass with a full adhesive back | Reflects radiant heat | Not published | Sticks to any clean surface | Firewalls, floor pans, fuel cells, ECU boxes |
| Techflex ThermaShield Wrap (adhesive edge) | Flat aluminized fiberglass joined along one edge by adhesive | Reflects radiant heat | Not published | Wraps around odd shapes | Connectors, sensors, short runs |
| Techflex Insultherm Tru-Fit fiberglass sleeving | Acrylic-treated braided fiberglass | Direct heat, no flame or fluid seal | 464°F (240°C) | Slides on | Individual wires, thermocouple and sensor leads |
| Techflex Insultherm spark plug boot sleeves | Double-thick fiberglass sleeves, 7-1/2" long | Direct heat at the header | 1,200°F | Slips over the boot | Plug wire boots close to headers |
| Techflex header wraps: Insultherm, Header Wrap SI, Volcano Wrap | Woven tape wrapped around the pipe | Keeps heat inside the exhaust | Fiberglass 1,200°F; silica 2,000°F; basalt 1,300°F | Wrapped with 1/4" overlap, tied at the ends | Headers, down pipes, turbo crossovers |
| Techflex Dragon Sleeve | Thin double-wall braid of non-flammable Dragon fibre | Flame, sparks, weld spatter, molten splash; not an insulator | None published; the fibre decomposes at 842°F (450°C) | Slides on; the braid expands | Lines and wires exposed to sparks or open flame |
Frequently asked questions
1" or 2" wrap?
1" wrap follows tight bends on small primaries more neatly; 2" goes on in half the time and suits 2-1/2" pipe and larger. Under 1-1/2" pipe, use 1".
Which material should I choose?
Fiberglass for most headers. Silica for turbo manifolds, crossovers and anything that glows. Basalt for its strength and bronze look.
How many rolls for a set of headers?
Typically one 50 ft roll of 2" wrap for a four-cylinder and two for a V8. Use the guide above for your pipe size.
Ratings are the maker's published figures.
