Composite Sleeper

Description

Item	Specification	Notes
Regular Cross-section	100×100mm, 150×150mm, 200×200mm, 300×300mm	Can be trapezoidal or U-channel integrated molding (compatible with QU70/P24 rails, etc.)
Standard Length	1000/2000/2500/3000/6000mm	Maximum customized length: 12 meters
Color	Customizable	–
Dimensional Tolerance	Length, Width, Height: ±1mm	Bolt hole positions precisely match rail fasteners
Structural Form	Solid molded integrated formation; U-channel integrated type	Solid type: No delamination, no bubbles; U-channel type: Comes with rail limit slots and pre-embedded metal sleeves

Molecular Weight: ≥3 million g/mol; 3–5 million g/mol preferred for heavy-duty applications; 5–7 million g/mol for specialized wear-resistant scenarios.
Modification Formula: Additives such as UV stabilizers, antistatic agents, flame retardants, and wear-resistant fillers can be incorporated as needed; insulation modification is required for electrified tracks, while UV-resistant masterbatch is added for outdoor applications.
Density: 0.93–0.96 g/cm³; weight is only 1/8 that of steel and 1/3 that of concrete sleepers, facilitating manual handling and installation.

Tensile Strength: ≥30 MPa (premium molded versions can exceed 32 MPa); resistant to tearing and cracking.
Compressive Strength (10% strain): ≥25–55 MPa (≥50 MPa required for heavy-duty gantry crane sleepers); minimal deformation under long-term rolling loads (deformation <0.5 mm after 100,000 load cycles).
Charpy Notched Impact Strength: ≥80–150 kJ/m²; unnotched impact strength >150 kJ/m²; resistant to brittle fracture from wheel impacts or heavy object strikes.
Flexural Strength: ≥30–45 MPa; resists bending deformation caused by concentrated track loads.
Elongation at Break: ≥100%; high toughness with no risk of brittle fracture.
Static Load Capacity: A single standard solid sleeper supports a static load of 2–8 tons; customized thickened versions accommodate 300-ton class heavy-duty equipment.

Design Service Life: Over 50 years for indoor industrial/mining use; over 30 years for outdoor UV-resistant modified versions—far superior to wooden sleepers (3–5 years).
Corrosion Resistance: Fully resistant to acids, alkalis, salts, coal slurry, and chemical waste liquids; immune to mold and insect infestation.
Noise and vibration reduction: Absorbs impact vibrations from the track; operating noise is reduced by over 30% compared to steel sleepers.
Environmental friendliness: Recyclable via re-granulation; free from preservative chemical contamination; a more eco-friendly alternative to treated timber sleepers.

Test Item	Standard Indicator	Description
Water Absorption	<0.01%	Almost non-absorbent; no expansion or deformation in humid mines and ports.
Operating Temperature Range	-50℃ to +80℃	No brittle fracture at low temperatures; suitable for cold storage and northern outdoor tracks; extreme low temperature resistance up to -269℃.
Melting Point	136–138℃	Avoid prolonged exposure above 80℃ in high-temperature workshops.
Shore D Hardness	63–68	Balances toughness and surface wear resistance; resistant to indentation and cracking.
Coefficient of Friction (vs Steel)	0.07–0.18	Self-lubricating; low sliding resistance on steel rails; noise reduction and vibration damping.
Wear Resistance (Mortar Abrasion)	Wear loss ≤0.02g/1000 revs	Wear resistance is 7 times that of carbon steel and 4–5 times that of nylon.
Insulation Resistance	>10^10 Ω·cm	Insulation against leakage for electrolytic aluminum and subway tracks.

Light-duty tracks for standard factory facilities: Molecular weight 3 million; impact strength ≥80 kJ/m²; compressive strength ≥25 MPa.
Heavy-duty tracks for mines/ports: Molecular weight 4–5 million; impact strength ≥120 kJ/m²; compressive strength ≥45 MPa.
Insulated tracks for electrolytic aluminum plants/subways: Enhanced with insulation-grade modification; volume resistivity >10¹⁰ Ω·cm.
Outdoor applications: Formulated with UV-resistant carbon black (black material) to delay aging and cracking.