Techflex ThermaShield Flat Heat Barrier, Full Adhesive, 6-7/8” Wide, Silver
Quick Overview
- Techflex ThermaShield Flat heat barrier, 6-7/8" (174.6 mm) wide
- Full adhesive back: sticks onto firewalls, floor pans and electronics boxes
- Aluminized fiberglass reflects radiant heat; rated to 1,200 degrees F
- Thin 0.025 in and flexible; follows curves; cuts with scissors
- Sold by the foot; silver
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$8.12
per Feet (USD)Techflex ThermaShield Flat Heat Barrier, 6-7/8" Wide, Full Adhesive Back, Sold by the Foot
Aluminized fiberglass with a full coat of permanent high-temperature adhesive: sticks straight onto firewalls, floor pans, fuel cells and electronics boxes and reflects radiant heat.
Techflex ThermaShield Flat is aluminized fiberglass with permanent, high-temperature adhesive over the whole back. Racetronix is a Techflex distributor. Peel it and stick it onto any clean surface that faces a heat source: the aluminum face reflects radiant heat and the fiberglass behind it insulates. The maker suggests it for electronic component boxes mounted close to engines; it suits firewalls, floor pans, tunnels, fuel cells and brackets too. This is the 6-7/8" (174.6 mm) wide roll, sold by the foot.
Key features
- Full adhesive back: peels and sticks onto any clean surface.
- Reflects radiant heat; the maker rates it to 1,200°F (649°C) without damage.
- Thin (0.025") and flexible, so it follows curves and folds around edges.
- Non-combustible; meets FAR 25; minimum -76°F (-60°C); very high abrasion resistance.
- Cuts with scissors. Sold by the foot.
ThermaShield Flat chart: widths we stock
| Part | Width | Width (mm) | Wall | Weight per foot |
|---|---|---|---|---|
| 299-TSN1.50SV | 1-1/2" | 38.1 | 0.025" | 0.020 lb |
| 299-TSN4.00SV | 4" | 101.6 | 0.025" | 0.056 lb |
| 299-TSN6.88SV | 6-7/8" | 174.6 | 0.025" | 0.109 lb |
All widths are silver and sold by the foot. Cut narrower with scissors, or lay strips edge to edge with a small overlap for wider areas.
Equivalents: other brands' adhesive heat barrier
Shopping for another brand? These are self-adhesive aluminized heat barriers in similar widths. Constructions and ratings differ, so they are near equivalents.
| Our part | Instead of (brand) | Their part number | Description | Match |
|---|---|---|---|---|
| 299-TSN1.50SV | DEI | 010408 | Cool Tape, self-adhesive aluminized glass, 1-1/2" x 15 ft | Near equivalent |
| 299-TSN1.50SV | Heatshield Products | 340001 / 340020 | Thermaflect Tape 1-1/2" x 3 ft / 20 ft | Near equivalent |
| 299-TSN4.00SV | Heatshield Products | 340410 | Thermaflect Tape 4" x 10 ft | Near equivalent |
| 299-TSN6.88SV | DEI | 010460 / 010461 / 010462 | Adhesive-backed reflective sheet, 12" x 12" / 12" x 24" / 24" x 24" | Near equivalent (sheet, cut to width) |
| 299-TSN6.88SV | Thermo-Tec | 13575 | Adhesive-backed heat barrier, 12" x 24" | Near equivalent (sheet, cut to width) |
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; full coat of permanent high-temperature adhesive |
| Width | 6-7/8" (174.6 mm) |
| Wall | 0.025" (0.6 mm) |
| Temperature | Up to 1,200°F (649°C) without damage (maker's rating); minimum -76°F (-60°C) |
| Flammability | Non-combustible; meets FAR 25 |
| Abrasion | Very high (maker's test) |
| Cutting | Scissors |
| Sold as | By the foot, silver |
Installing ThermaShield Flat
- Clean the surface with a degreaser and let it dry. The adhesive needs a clean, dry, oil-free surface.
- Make a paper template for curved or awkward areas, then cut the material to shape with scissors.
- Peel back a few inches of the liner, place the edge, and press it down as you peel the rest, working from the center out to push out air.
- Press or roll it down firmly, especially at the edges.
- Fit it to the surface that faces the heat, with the aluminized side toward the heat source.
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 |
| Techflex Weld Wrap HD | Silicone-coated silica braid with hook-and-loop closure | Weld spatter, slag, sparks; heat | 500°F (260°C) continuous; 2,000°F (1,093°C) intermittent | Wraps on with hook-and-loop | Welding leads and hoses; lines that see sparks |
Frequently asked questions
ThermaShield Flat or ThermaShield Wrap?
Flat has adhesive over the whole back and sticks onto a surface. ThermaShield Wrap has adhesive along one edge only and wraps around a hose, harness or connector.
Can I stick it on the exhaust or header?
No. It is made for surfaces that face the heat, not for the hot part itself. Wrap the pipe with header wrap.
Can I cover a wider area?
Yes. Lay strips side by side with a small overlap, or use the widest roll and cut it to shape.
Ratings are the maker's published figures.
