Techflex T6 ThermaShield Split Heat Sleeve, 1/4” ID x 4 ft, Silver
Quick Overview
- Techflex T6 ThermaShield split heat sleeve, 1/4" (6.3 mm) ID, 4 ft piece
- Aluminized fiberglass: reflects radiant heat from sources up to 1,400 degrees F
- Wraps around assembled hoses and harnesses; seals with its adhesive strip
- Fits 1/4" hard line
- Material rated 491 degrees F (255 C) continuous; cuts with scissors
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$4.88
per EACH (USD)Techflex T6 ThermaShield Split Heat Sleeve, 1/4" (6.3 mm) ID, 4 ft Piece
Aluminized fiberglass tube that wraps around an assembled hose or harness and seals with its own adhesive strip: reflects radiant heat from headers, turbos and exhaust.
Techflex T6 ThermaShield is a preformed, split tube of fiberglass with a laminated aluminum face. Racetronix is a Techflex distributor. Because it is split along its length, it goes on after the hose ends are fitted: open it, lay it around the line and press the adhesive strip closed. The bright aluminized face reflects radiant heat before it reaches the line, and the fiberglass behind it insulates against what gets through. This is the 1/4" (6.3 mm) size, sold as a 4 ft piece.
Key features
- Reflects radiant heat from sources up to 1,400°F (760°C): the maker's test ran a braided hose 3/8" from a 1,400°F source without the sleeve breaking down.
- Wraps on: no need to remove fittings or unplug connectors.
- Closes with a high-temperature adhesive strip along its edge (not hook-and-loop).
- Material rated -76°F to 491°F (-60°C to 255°C) continuous; the glass melts at 2,048°F (1,120°C). Non-flammable.
- Cuts with scissors. Silver, 4 ft piece.
Which size fits my hose?
This size suits: 1/4" Aluminum hard line.
Choose the size whose inside diameter is equal to or just larger than the outside of your hose or bundle, so the tube closes fully along its adhesive strip without being stretched. If you are between sizes, take the larger one. The tube goes on over the hose between the fittings; it does not need to pass over them.
Hose outside diameters are nominal values from our own hose pages. Measure your hose if in doubt.
T6 ThermaShield chart: all sizes
| Part | Inside diameter | ID (mm) | Flat width | Wall | Weight per piece |
|---|---|---|---|---|---|
| 299-T6F0.25SV | 1/4" | 6.3 | 1-13/16" | 0.042" | 0.10 lb |
| 299-T6F0.38SV | 3/8" | 9.5 | 2-1/2" | 0.042" | 0.15 lb |
| 299-T6F0.50SV | 1/2" | 12.7 | 3-3/8" | 0.042" | 0.20 lb |
| 299-T6F0.63SV | 5/8" | 15.9 | 4-1/4" | 0.042" | 0.25 lb |
| 299-T6F0.75SV | 3/4" | 19.0 | 5" | 0.042" | 0.30 lb |
| 299-T6F1.00SV | 1" | 25.4 | 5-13/16" | 0.042" | 0.35 lb |
| 299-T6F1.25SV | 1-1/4" | 31.8 | 6-11/16" | 0.042" | 0.45 lb |
| 299-T6F1.50SV | 1-1/2" | 38.1 | not published | 0.042" | 0.50 lb |
| 299-T6F2.00SV | 2" | 50.8 | 7-3/8" | 0.042" | 0.60 lb |
All sizes are silver and sold as 4 ft pieces.
Equivalents: other brands' aluminized heat sleeve
Shopping for another brand? These do the same job: aluminized fiberglass sleeve that reflects radiant heat. None is identical. Most close with hook-and-loop, and the slip-on ones must go on before the hose ends.
| Our part | Instead of (brand) | Their part number | Description | Match |
|---|---|---|---|---|
| 299-T6F0.50SV | DEI | 010405 | Heat Shroud, hook-and-loop, fits 1/2"-1-1/4", 3 ft | Near equivalent (hook-and-loop) |
| 299-T6F0.50SV | Thermo-Tec | 14030 / 14031 | Express Heat Sleeve 1/2"-1", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F0.50SV | DEI | 010418 | Heat Sheath 1/2" x 36", slip-on | Near equivalent (slip-on) |
| 299-T6F0.63SV | DEI | 010405 | Heat Shroud, hook-and-loop, fits 1/2"-1-1/4", 3 ft | Near equivalent (hook-and-loop) |
| 299-T6F0.63SV | Thermo-Tec | 14030 / 14031 | Express Heat Sleeve 1/2"-1", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F0.75SV | DEI | 010405 | Heat Shroud, hook-and-loop, fits 1/2"-1-1/4", 3 ft | Near equivalent (hook-and-loop) |
| 299-T6F0.75SV | Thermo-Tec | 14030 / 14031 | Express Heat Sleeve 1/2"-1", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F0.75SV | DEI | 010403 | Heat Sheath 3/4" x 36", slip-on | Near equivalent (slip-on) |
| 299-T6F1.00SV | DEI | 010405 | Heat Shroud, hook-and-loop, fits 1/2"-1-1/4", 3 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.00SV | Heatshield Products | 274100 / 274101 | Thermaflect Sleeve, hook-and-loop, 1" x 3 ft / 10 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.00SV | Thermo-Tec | 14030 / 14031 | Express Heat Sleeve 1/2"-1", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.00SV | Thermo-Tec | 14035 / 14036 | Express Heat Sleeve 1"-1-1/2", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.00SV | DEI | 010419 | Heat Sheath 1" x 36", slip-on | Near equivalent (slip-on) |
| 299-T6F1.25SV | DEI | 010405 | Heat Shroud, hook-and-loop, fits 1/2"-1-1/4", 3 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.25SV | Thermo-Tec | 14035 / 14036 | Express Heat Sleeve 1"-1-1/2", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.25SV | DEI | 010404 | Heat Sheath 1-1/4" x 36", slip-on | Near equivalent (slip-on) |
| 299-T6F1.50SV | Thermo-Tec | 14035 / 14036 | Express Heat Sleeve 1"-1-1/2", 3 ft / 12 ft | Near equivalent (hook-and-loop) |
| 299-T6F1.50SV | DEI | 010420 | Heat Sheath 1-1/2" x 36", slip-on | Near equivalent (slip-on) |
Other brands' names and part numbers are their owners' trademarks, listed only to help you compare. Check sizes against your application.
Specifications
| Construction | Aluminum-laminated fiberglass, preformed split tube with adhesive strip |
| Inside diameter | 1/4" (6.3 mm) |
| Flat width | 1-13/16" |
| Wall | 0.042" (1.1 mm) |
| Continuous temperature | -76°F to 491°F (-60°C to 255°C) |
| Radiant heat | Reflects radiant heat from sources up to 1,400°F (760°C) |
| Melting point | 2,048°F (1,120°C) |
| Flammability | Non-flammable; halogen free; meets FAR 25 |
| Cutting | Scissors |
| Sold as | 4 ft piece, silver |
Installing T6 ThermaShield
- Clean and dry the line. The adhesive needs a clean surface on the sleeve edge, so keep oil off it.
- Cut the sleeve to length with scissors. It can be cut into shorter pieces and butted end to end.
- Open the split, lay the sleeve around the hose or harness with the aluminized face out, and peel the backing from the adhesive strip.
- Press the strip closed along its whole length, working from one end.
- Keep the closed seam away from the heat source where you can.
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
T6 ThermaShield or FireFlex fire sleeve?
T6 for radiant heat, when the line can see a header, turbo or exhaust, and when the hose is already assembled. FireFlex for steady heat soak, flame and fluid splash; it has to slide on before the hose ends go on.
Why does it say 491°F when it handles 1,400°F?
The two figures measure different things. 1,400°F is the temperature of the heat source the sleeve can face and reflect; 491°F is the continuous temperature the sleeve material itself is rated for.
Can I use it on a header or exhaust pipe?
No. It is made to protect lines and wiring from a nearby heat source, not to sit on the pipe. Wrap the pipe with header wrap instead.
Is it hook-and-loop?
No. T6 closes with a high-temperature adhesive strip, which stays flat and does not catch on things.
Ratings are the maker's published figures.
