Silicone Fiberglass Fire-proof Tube-SFT1500: Product Overview

The Silicone Fiberglass Fire-proof Tube-SFT1500 is a heavy-duty industrial cable protection sleeve built with an alkali-free fiberglass braid interior and an iron oxide red silicone rubber exterior. This fiber-inside, silicone-outside dual-layer construction delivers six protective properties in one product: fireproofing, flame retardancy, thermal insulation, heat preservation, acid and alkali resistance, and anti-aging performance. Engineers specifying cable protection for steel mills, EV battery packs, rail transit, and high-voltage power systems will find that each performance claim in the Silicone Fiberglass Fire-proof Tube-SFT1500 is supported by documented test results across multiple internationally recognized standards.

Validated Technical Performance

The Silicone Fiberglass Fire-proof Tube-SFT1500 has been tested against multiple internationally recognized standards:

• Flammability (SAE J369): VW-1 vertical-burn classification—the most demanding flame rating under this standard.
• Thermal Conductivity (ASTM E1530): Pass.
• Dielectric Strength (EN 6059-501:2010, ASTM D3755-20): Average 7,000V; individual minimum 6,000V.
• Thermal Runaway (1,100°C, 20 minutes): Pass—structural integrity maintained under sustained extreme thermal exposure.

For high-voltage EV and energy storage wiring harnesses, VW-1 flame classification combined with 6,000V minimum dielectric strength addresses both flame containment and electrical isolation requirements from a single sleeve. Test standards vary by industry: SAE J369 is referenced in automotive and industrial applications; rail transit and power infrastructure projects may specify different compliance frameworks.

Key Technical Features

Wide Continuous Operating Range

Stable from -70°C to +260°C continuously, the Silicone Fiberglass Fire-proof Tube-SFT1500 eliminates the need for separate products in cold-environment installation and high-temperature cable runs within the same project.

1,650°C Thermal Spike Resistance

Without melt-through or structural collapse, the SFT1500 provides the safety margin needed for cable runs exposed to molten metal splash, open flame, or direct contact with high-temperature surfaces in steel, glass, and foundry environments.

Heavy-Duty Wall Construction

Wall thickness from 1.8 mm to 5.7 mm depending on the selected ID. When specifying fiberglass cable sleeves, define wall thickness tolerance and incoming measurement method in the purchase order—discrepancies between stated and measured wall thickness are a recurring cause of incoming inspection disputes.

Six-Property Integrated Protection

One sleeve covering fireproofing, flame retardancy, thermal insulation, heat preservation, acid and alkali resistance, and anti-aging reduces insulation SKU count for projects spanning multiple hazard types.

Multi-Certification Facility

ISO 9001, IATF 16949, ISO 14001, ISO 45001, and Military GJB9001C certified. Formal VW-1 flammability documentation is available for EV harness supplier qualification audits—covering both automotive quality management and defense procurement requirements in a single supplier.

Application Scenarios

Steel, Metallurgy, and Glass Manufacturing

Molten metal splash and radiant heat in these environments exceed the limits of standard insulation. The Silicone Fiberglass Fire-proof Tube-SFT1500 provides a VW-1 flame classification and 1,650°C thermal spike tolerance with documented test backing. Cable insulation showing visible color deepening or surface hardening in high-temperature zones is a sign of thermal oxidation aging—the silicone coating in the SFT1500 resists this degradation under normal industrial operating conditions.

EV Battery Packs and High-Voltage Wiring

Battery pack harnesses require both thermal runaway containment and dielectric isolation under normal high-voltage operation. The SFT1500 passes the 1,100°C/20-minute thermal runaway protocol and maintains a 6,000V individual minimum dielectric value—addressing both requirements for EV and stationary energy storage applications.

Rail Transit and Power Substations

Metro, high-speed rail, and transformer station installations require cable protection with long service life and minimal maintenance access. Chemical corrosion resistance, ozone resistance, and anti-aging properties meet the multi-decade reliability requirements of grid and rail infrastructure. Busbar systems in distribution cabinets also benefit from the SFT1500's combined electrical insulation and flame protection.

How the Silicone Fiberglass Fire-proof Tube-SFT1500 Compares to Standard Heat Shrink

Standard heat shrink formats—including dual wall heat shrink tubing and 1/2 inch heat shrink tubing—provide basic cable sealing for moderate environments. The Silicone Fiberglass Fire-proof Tube-SFT1500 addresses three requirements these products are not designed to meet: 1,650°C thermal spike tolerance, formal VW-1 flame classification, and 6,000V minimum dielectric strength in one sleeve. For applications that do not require any of these properties, standard heat shrink remains the appropriate and cost-effective choice.

Specifications

Silicone Fiberglass Fire-proof Tube-SFT1500 — fiber inside, silicone outside. Supplied in 20 m reels. Custom lengths and non-standard inner diameters available on request.