Product Description
Ultra-low temperature resistant and ultra-resistant mineral oil and fuel oil cross-linked polyolefin locomotive wire sheath material is made of high-purity resin as the base material, and halogen-free flame retardant, cross-linking agent, antioxidant, etc. are added to mix and extrude and granulate. In terms of performance, it combines excellent properties such as halogen-free, heat-resistant, flame-retardant, low smoke, and oil-resistant. It has no precipitation pollution, meets the relevant requirements of Rohs, etc., and is easy to extrude and process.
Application Field
Suitable for locomotive cables of European standard EN50264.
Product Parameters
| Testing items | VALUE | Typical Value | UNIT | Method |
| Physical properties | ||||
| Hardness | 94±3 | 93 | Shore Hardness A | GB/T 2411 |
| Density | ≤1.50 | 1.45 | g/cm3 | GB-T 1033 |
| Number of failures at low temperature embrittlement temperature | ≤15/30 | 0/30 | PCS | GB/T 5470 |
| Tensile strength before irradiation | ≥8 | 8.5 | MPa | GB/T 1040 |
| Elongation at break before irradiation | ≥200 | 220 | % | GB/T 1040 |
| Tensile strength before aging | ≥10 | 13.2 | MPa | GB/T 1040 |
| Elongation at break before aging | ≥150 | 160 | % | GB/T 1040 |
| Thermal elongation 0.2MPa×200℃×15min | ||||
| Elongation under load | ≤100 | 10 | % | GB/T 2951 |
| Permanent deformation | ≤25 | 0 | % | GB/T 2951 |
| Aging performance 135℃×168h | ||||
| Change rate of tensile strength | ≤±30 | 10 | % | GB/T2951.12 |
| Change rate of elongation at break | ≤±30 | -13 | % | GB/T2951.12 |
| oil resistant 100℃×72h | ||||
| Change rate of tensile strength | ≤±30 | -10 | % | GB/T2951.12 |
| Change rate of elongation at break | ≤±40 | -18 | % | GB/T2951.12 |
| oil resistant 70℃×168h | ||||
| Change rate of tensile strength | ≤±30 | -16 | % | GB/T2951.12 |
| Change rate of elongation at break | ≤±40 | -25 | % | GB/T2951.12 |
| Acid and alkali resistant | ||||
| N-oxalic acid solution | ||||
| Change rate of tensile strength | ≤30 | -20 | % | GB/T2951.12 |
| Elongation at break | ≥100 | 130 | % | GB/T2951.12 |
| N-sodium hydroxide solution | ||||
| Change rate of tensile strength | ≤30 | -14 | % | GB/T2951.12 |
| Elongation at break | ≥100 | 140 | % | GB/T2951.12 |
| Volume Resistivity at 20℃ | ≥1.0×10^13 | 2.2×10^14 | Ω.cm | GB/T 1410 |
| Dielectric strength | ≥20 | 22 | MV/m | DIN EN 6024 |
| Oxygen index | ≥30 | 36 | % | GB/T 2406 |
| Amount of halogen acid gas | ≤0.5 | 0.1 | mg/g | IEC 60754 |
| PH | ≥4.3 | 5.6 | - | IEC 60754 |
| Conductivity | ≤10 | 7 | μs/mm | IEC 60754 |
The application of 125°C irradiation cross-linked zero halogen flame-retardant polyolefin cable materials in high-speed rail locomotive wire and cable sheath materials is to meet the strict requirements of high-speed rail locomotives for cable materials during operation.
European Standard Irradiation Cross-linked Halogen-Free Flame-Retardant Polyolefin High-Speed Rail Locomotive Cable Materials Have The Following Characteristics
Temperature resistance: It can withstand a long-term operating temperature of 125°C and is suitable for wiring of electrical equipment inside locomotives.
Halogen-free flame retardant: It does not contain halogen, and produces less toxic gas and corrosive smoke during combustion, which improves the safety of high-speed rail locomotives.
Irradiation cross-linking: Through the irradiation cross-linking process, the mechanical properties and chemical corrosion resistance of the material are enhanced, so that it can maintain stable performance even in harsh environments.
Environmental protection characteristics: It meets environmental protection requirements, produces less smoke and toxic gases during combustion, which is beneficial to environmental protection and passenger safety.
Chemical reagent resistance: It can resist the erosion of oils and other chemicals and is suitable for various environments that may be exposed to inside locomotives.
Weather resistance: It has good weather resistance and can adapt to outdoor environments and temperature changes.
Flexibility: The cable material is flexible, which is convenient for installation and wiring, especially when the space inside the vehicle is limited.
Compliance with standards: It usually complies with international and European standards, such as the EN50264 series of standards, and the Chinese national standard GB12528.11-2003.
The wiring in the European railway industry mainly follows these technical systems. Therefore, materials used in European locomotive cables must meet these technical systems and standard requirements:
① EN 50306 (Thin-walled locomotive and rolling stock wiring) Commonly used for internal wiring in locomotives and rolling stock. Key features include: Thin-walled and lightweight; High-temperature rating (typically 105℃/120℃); Oil-resistant, flame-retardant, low-smoke halogen-free; Strong stability in confined spaces. Common application models: EN 50306-2 / 3 / 4
② EN 50382 (High-temperature and high-voltage locomotive and rolling stock cables) Used in high-heat areas such as locomotive traction systems or near power units: Temperature rating up to 150℃-260℃; Uses high-temperature materials (XLPO, silicone rubber, PFA, ETFE, etc.); Suitable for traction systems, braking systems, and high-voltage wiring.
③ EN 50264 (Multi-core and medium-thick-walled locomotive cables) Suitable for medium-intensity scenarios in locomotives and rolling stock: Operating temperature typically 90-120℃; Oil-resistant and mechanical fatigue resistant; Common multi-core cable structure.
Common industry applications: Vehicle interior control wiring (EN 50306): door control, HVAC, interior lighting, communication and signaling systems; Traction power wiring (EN 50306) 50382): Motors, inverters, braking systems, power circuits; Undercarriage (high mechanical strength areas): Rail vehicle connecting cables, undercarriage moving harnesses, oil-resistant areas;
Material Systems (Insulation/Sheathing) The following material systems are widely used in European locomotive lines:
A. Cross-linked Polyolefin (XLPO) Appears in standards such as EN50306 / EN50264.
Features: Lightweight, heat resistant to 105℃–125℃, excellent electrical properties
B. High-Temperature Cable Materials (Specified by EN50382)
Includes: Silicone Rubber/SiR, EPDM (cross-linked system), PTFE/PFA/ETFE/FEP (fluoropolymer)
Features: Temperature range 150℃–260℃, very high mechanical and electrical stability
Applications: Near high-heat areas such as engines, brakes, and traction converters
C. Low Smoke Halogen-Free (LSZH)
Applications: Control lines, signal lines, and light-load power lines inside locomotives and rolling stock;
One of the core requirements of railways.
Commonly used materials: XLPO, LSZH flame-retardant polymer systems
Features: Extremely low smoke density during fire, no halogen acid gases, excellent flammability (passes EN45545)
