BSTFLEX 40mm Heat Shield Fire Sleeve 5ft Red

BSTFLEX 1.57" (40mm) red fire sleeve — a 5-foot, silicone-coated fiberglass protective cover engineered to shield automotive hoses, fuel lines and electrical wiring from extreme heat and abrasion.

This heat-resistant sleeve combines a fiberglass inner core with a silicone outer coating to provide durable insulation and flame-retardant protection for under-hood and industrial applications. Designed for installers, mechanics and DIYers, it slips over lines and harnesses to reduce thermal transfer, resist molten splash, and extend component life while meeting multiple safety standards and laboratory tests.

How does this sleeve protect hoses and wiring from high temperatures?

The BSTFLEX sleeve uses a fiberglass body to resist heat and a silicone coating that helps block radiant and convective heat transfer. It tolerates a wide operating temperature range and passed tests for flame resistance and molten splash, offering robust defense where heat exposure is a problem.

• Operating range: -60°C to 260°C for continuous service
• Fiberglass core provides thermal barrier and structural stability
• Silicone exterior repels oils and reduces heat absorption
• Proven against molten splash and flame exposure in certification tests

Will it fit my hose or wire and how easy is installation?

This product is sized for a 1.57" (40 mm) inner diameter and comes as a continuous 5-foot (1.5 m) length, making it suitable for many medium-diameter hoses and looms. The sleeve is designed for straightforward retrofit: slide it over the line or feed wiring through before final routing; trimming to length is simple with appropriate cutting tools.

• Inner diameter: 1.57" (40 mm) — fits many automotive and industrial lines
• Length: 5 feet (1.5 m) — continuous, easy to cut to needed segments
• Installation: slip-on or feed-through application, simple trimming
• Silicone coating reduces snagging and eases routing in tight spaces

What certifications and durability tests support performance?

BSTFLEX fire sleeve has been evaluated against a range of industry standards and lab tests that assess flame resistance, smoke/toxicity, and mechanical durability. Those certifications and tests indicate suitability for demanding environments like rail, automotive, and industrial settings where safety and longevity matter.

• Meets DIN EN45545-2 and related rail combustibility standards
• Passed molten splash, abrasion, oil resistance and tensile strength tests
• UL 1441, MSHA, ROHS and REACH compliance for material safety
• Thermal conductance and timed flame exposure tests validate heat performance

Does the silicone finish affect odors or chemical resistance?

When exposed to high temperatures, silicone can emit a slight odor; this is a normal property of silicone coatings and not a defect. The outer silicone layer also enhances resistance to oils and common automotive fluids, helping the sleeve remain effective in service.

• Minor silicone odor possible at elevated temperatures — expected behavior
• Improved oil and fluid resistance compared with bare fiberglass
• Coating helps prevent fiber abrasion and prolongs sleeve life
• Suitable for areas with intermittent fluid exposure and heat cycling

Who is this for? Installers, mechanics, fleet maintenance teams and hobbyists who need a reliable, compact heat shield for medium-diameter hoses, fuel lines, hydraulic lines and wiring looms will find this sleeve useful. It’s intended where thermal protection, flame resistance and abrasion durability are priorities, and where a five-foot continuous length and 40 mm diameter meet routing needs. BSTFLEX backs the product with lifetime warranty coverage and a suite of test certifications relevant to automotive and rail applications.