Rail Plastic Dowel

Rail Plastic dowel (Rail Plastic Sleeve)

Also know as plastic sleeve, plastic insert, concrete dowel, concrete insert, Nylon Dowel, PA66 Dowel, being widely used in rail fastening.

It was also called rail plastic sleeve/plastic insert/concrete dowel/ concrete insert, which is a counter-party fastener for a sleeper screw spike or anchor bolt, and it is pre-imbedded into the concrete or wooden sleeper tie, installed together with screw spikes, "guide plates and rail clips to fasten the rail tracks.

Functions of the Rail Plastic Dowel

Rail Plastic Dowels

In a set of rail fastening system, the plastic dowel can be considered as the fastening foundation, as it needs to be pre-inserted into the concrete sleeper separately before assembling the rail fastening system parts. It is used to guarantee the good connection and linkage of the rail fastening system with the concrete sleeper, with screw spikes or bolts.On the other hand, similarly as the rail pad or rail insulators, the plastic insert’s another function is to insulate the fastener parts from the ties. Therefore, the quality of this small pre-inserted part into the concrete sleeper, especially its strength and fatigue life, is of great importance to the whole rail line.

Types of Rail Plastic Dowel

Rail Plastic Dowels are always used in SKL fastening systems, and can be classified according to its materials needed: of PA66 or HDPE, depending on different technical specification requirements from clients.

Materials: HDPE, PA6, PA66, PA66+GF30%; Dimension: Different Size Available, Customized according to the drawing; Standard: DIN, NF, AREAMA, etc

HDPE Plastic Dowel Specifications:

No.	Technique parameter	Unit	Technical requirement	Value
1	Density	g/	0.95-0.98	0.95
2	Tensile strength	Mpa	≥19	19
3	Elongation	%	>80	150
4	Melting point	°C	170-190	190
5	Insulation resistance	Ω	≥1×1010	3.5×1010
6	Hardness	A	≥98	98(A)

Material PA66 : Nylon 66.69%, glass fiber 30%, other 1%

PA66 Plastic Dowel Specifications

No.	Technique parameter	Unit	Technical requirement	Value
1	Density	g	1.3—1.45	1.45
2	Tensile strength	Mpa	≥170	178
3	Elongation	%	≤4.4	4.0
4	Bending Strength	Mpa	≥250	290
5	Impact Strength(No gap)	KJ/m2	≥80	85
6	Melting point	°C	250°C—270	270
7	Insulation resistance	Ω	≥1×108	5×108
8	Glass fiber content	%	30—35	35
9	Hardness	HRR	≥110	118

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