railway plastic dowel

Railway plastic dowel is also called railway ferrule, railroad plastic sleeve, rail plastic insert, concrete insert or rail dowel for concrete sleeper. It is usually imbedded into the concrete sleeper together with railroad screw spikes to guide railroad tie plates and rail clips to fasten the rail track.

Railway plastic dowel is usually used in the rail fastening system as foundation. It is inserted into the concrete sleeper separately before assembling other fastening accessories to form rail fastening system. Rail plastic sleeve ensures the good connection and linkage of rail fastening system with concrete sleeper, screw spikes or rail track bolts.

railway plastic dowel
railway dowel in rail fastening system

Moreover, another function of rail plastic dowel insert is to insulate the railroad fasteners from the ties. Therefore, the strength and fatigue life of the rail plastic sleeve is crucial to the safety of the whole rail track line. Taking WJ-8 fastening system for example, the collaboration of anchor bolts and imbedded plastic sleeves in the track slabs make the tie plate tightly fastened to steel rail and railway sleepers. The screw spikes go through rail clips into the railway plastic dowel, to fulfill a enough elasticity range, to avoid the rail bolt against becoming loose, and to decrease the maintenance work accordingly.

Rail plastic dowel is usually used in SKL fastening systems, and can be classified according to its raw materials: PA66 or HDPE, depending on different technical specification requirements of clients.

Types of Railway Plastic Dowel

Type For different sizes of screw spikes or anchor bolts
Material Reinforced Nylon 66 (PA66: Nylon 66.69%, glass fiber 30%, other 1%) HDPE
Technical specifications Density:1.3-1.45g/cm3
Tensile strength: ≥170Mpa
Elongation: ≤4.4%
Bending Strength: ≥250Mpa
Impact Strength(No gap): ≥80KJ/m2
Melting point:250-270°C
Insulation resistance:≥1×108Ω
Glass fiber content:30-35%
Density: 0.95-0.98g/cm3
Tensile strength: ≥19Mpa
Elongation: >80%
Melting point: 170-190°C
Insulation resistance: ≥1×1010Ω
Color Yellow, black, white, blue, green, etc, based on clients' requirements

HDPE Rail Sleeve

Technical Parameter Density Tensile Strength Elongation Melting Point Insulation Resistance Hardness
Unit g/cm3 Mpa % Ω A
Technical Requirement 0.95-0.98 ≥19 >80 170-190 ≥1×1010 ≥98
Value 0.95 19 150 190 3.5 ×1010 98(A)

PA66 Rail Plastic Dowel (PA66: Nylon 66.69%, Glass Fiber 30%, Other 1%)

Technical Parameter Unit Technical Requirement Value
Density g/cm3 1.3-1.45 1.45
Tensile Strength Mpa ≥170 178
Elongation % ≤4.4 4.0
Bending Strength Mpa ≥250 290
Impact Strength (No gap) KJ/m2 ≥80 85
Melting Point 250 -270 270
Insulation Resistance Ω ≥1×108 5×108
Glass Fiber Content % 30-35 35
Hardness HRR ≥110 118
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