BSTFLEX 13mm (1/2") Aluminized Self-Closed Heat Shield Sleeve 78" — Side-Entry, Oil-Resistant Thermal Wrap

BSTFLEX 13mm (1/2") self-closed aluminized heat shield sleeve is a side-entry, self-wrap thermal protector designed to shield hoses, wire harnesses and cables from high temperatures up to 150°C.

This 78-inch (2 meter) protective sleeve combines aluminum foil, fiberglass and polyester into a flexible, side-entry wrap that slips around existing wiring, hoses or tubing for fast heat mitigation. At 0.5 mm thickness with a 25% overlap design, the sleeve offers robust thermal insulation performance and oil resistance for automotive and industrial environments. It is intended as a passive barrier against radiant and convective heat, improving component longevity when routed near exhausts, manifolds or other hot zones.

How does this sleeve reduce heat exposure to wires and hoses?

The aluminized outer layer reflects radiant heat while the fiberglass core provides insulating bulk, reducing the temperature transfer to enclosed items. Because the sleeve is side-entry and self-wrapping, it can be installed around already-routed harnesses without disconnecting connectors. This structure helps lower operating temperatures around sensitive cables and rubber hoses when placed between the heat source and the component.

• Reflective aluminum layer redirects radiant heat away from protected parts
• Fiberglass layer offers thermal resistance and dimension stability
• 0.5 mm thickness and ≥100°C tested insulation performance
• Side-entry design allows retrofitting on installed lines

What temperatures and environments is the BSTFLEX sleeve suitable for?

The sleeve is rated for continuous use from -40°C up to +150°C, making it suitable across a wide range of climates and engine bay conditions. It resists oils and handles typical automotive heat exposure; however, it is not intended as a replacement for rigid shielding in direct flame scenarios. For extreme flame contact, purpose-built flameproof barriers should be used instead.

• Working temperature range: -40°C to +150°C
• Proven thermal insulation reduction: ≥100°C performance threshold
• Oil-resistant outer materials for under-hood exposure
• Avoid direct contact with open flames or molten sources

How do I install the side-entry, self-wrap sleeve on my vehicle or equipment?

Installation is straightforward: open the side-entry seam, position the sleeve around the cable bundle or hose, and wrap it closed so the edges overlap approximately 25% for secure coverage. Trim to length with scissors if needed, and ensure the sleeved area does not pinch flexible hoses or obstruct moving parts. For best results, place the sleeve between the heat source and the vulnerable component rather than directly on the hottest surface.

• Slip sleeve around existing harnesses via the side entry seam
• Maintain ~25% overlap along the wrap for stable closure
• Cut to fit with sharp scissors; avoid sharp bends at edges
• Keep sleeve clear of rotating parts and open flames

What comes in the package and what should I check before buying?

The listing includes one 78" (2 meter) piece of BSTFLEX self-wrap aluminized sleeve at 13 mm (1/2") inner diameter. Confirm the sleeve diameter and length against your harness, hose, or tubing dimensions so you have full coverage; the product thickness is 0.5 mm. If you plan multiple runs or larger bundles, order additional lengths or larger diameters as needed.

• Package contents: 1x BSTFLEX self-wrap aluminized sleeve (78" / 2 m)
• Inner diameter: 13 mm (1/2"); thickness: 0.5 mm
• Side-entry design with 25% overlap—verify size for full coverage
• Contact seller support for sizing questions prior to purchase

Who is this for? The BSTFLEX 13mm self-closed aluminized heat shield sleeve is aimed at DIY mechanics, automotive technicians, fabricators and industrial maintenance teams who need a fast, retrofit-capable solution to reduce heat exposure for wire harnesses, fuel and vacuum lines, and small-diameter hoses. It’s especially useful when routing or repairing existing systems where disconnecting wiring is impractical, or when adding a reflective barrier to extend component life in hot engine bays and close-to-exhaust installations. Remember to avoid direct flame contact and choose appropriate diameters for bundled applications.