Testing standard TB/T for Rail insulator of rail clip IV fastening system
Release Time:
Nov 10,2022
The testing of rail insulator G4 and G4J of type IV rail fastening system should be according Standard TB/T 3395.2-2015.
1.1 Description of rail clip IV fastening system components
① Number of parts for each set of rail clip IV fastening system
|
Item No. |
Name |
Qty/set(pcs) |
Material |
Mass or Volume |
Remark |
|
1 |
G4 spring clip |
2 |
60Si2MnA |
1.60kg |
Used in general areas |
|
JA spring clip |
1.26kg |
Used at rail joints |
|||
|
JB spring clip |
1.28kg |
||||
|
2 |
Rail shoulder TZ4 |
2 |
QT450-10 |
2.80Kg |
|
|
3 |
Rail insulator G4 |
2 |
PA66 |
107.3cm3 |
Used in general areas |
|
Rail insulator G4J |
2 |
91.4cm3 |
Used at rail joints |
||
|
4 |
Rubber pad RP4 |
1 |
Natural or synthetic rubber |
250cm3 |
|
②The Rail insulator ,which is also called GFN liner, is divided into two types: The G4 Rail insulator is used in general sections and the rail insulator G4J is used at the rail joint sections.
③C4, JA, and JB types of rail clips are available. C4 clips (Φ20mm) are installed in general sections, and JA and JB clips (Φ18mm) are installed in rail joint sections. The anti-rust paint of JA rail clip is gray, and it is used with the rail insulator G4(non-black) of No. 7, 8, and 9 joints; The anti-rust paint of JB rail clip is black, and it is used with the rail insulator G4J(black) of No. 10, 11, 12 and 13 joints.
The testing of rail insulator G4 and G4J of type IV rail fastening system should be according Standard TB/T 3395.2-2015. Here below is rail insulator part from the avaliable vision of standard TB/T 3395.2-2015.
Standard TB/T 3395.2-2015
Part 5.4 Rail insulator
5.4.1 Raw material
The raw material of rail insulator should be PA66 or other materials not less than its performance.
The physical and mechanical properties of raw materials should meet the requirements of Table 2.
Table 2 Physical and mechanical properties of raw materials for rail insulator
|
Item No. |
Properties |
unit |
Requirement |
|
1 |
Density |
g/cm3 |
1.30~1.45 |
|
2 |
Melting point |
℃ |
255~270 |
|
3 |
Tensile Strength |
MPa |
>=150 |
|
4 |
Bending strength |
MPa |
>=200 |
|
5 |
Unnotched impact strength |
kJ/m2 |
>=80 |
|
6 |
Volume resistivity |
Ω∙cm |
>=1x1014(dry state) |
|
7 |
>=1x1010(wet state) |
||
|
8 |
Glass fiber content |
__ |
30%~35% |
5.4.2 Specification and dimensions
The type and size of the rail insulator shall conform to the design stipulations, and the flatness of the pressing rail surface and the side prisms against the rail bottom shall be 0. 5mm.
5.4.3 Appearance
The surface of the rail insulator shall be uniform in color and without visible defects such as air holes, coke marks, flash and burrs.
5.4.4 Drainage rate
Rail insulator should absorb water modulation. The discharge rate of the rail insulator after water absorption modulation shall not be less than 0.5%.
5.4.5 Hardness
Rail insulator hardness should not be less than 105 HRR.
5.4.6 Shear resistance
The ears at both ends of the rail insulator shall not be damaged after shearing by a force of 4.5kN.
5.4.7 Impact toughness
The rail insulator shall not crack after impact test.
5.4.8 Internal voids
There should be no air bubbles or holes inside the rail insulator.
5.4.9 Insulation resistance
The insulation resistance of the rail insulator shall be greater than 5x106Ω.
Kunshan Alex manufactures and supplies kinds of GFN-66 Liner (PA66 rail insulator) according to TB/T standard, and other standard like EN, ASTM, IRS, GOST, JIS,etc, which are extensively used for railway tracks worldwide. Our rail insulators are processed by experienced engineers to meet maximum reliability and efficiency.
How to order?
Contact our sales team and send your designed drawings of the rail insulator, or provide a sample for us to measure the dimensions and offer for you.
Trust our service and quality will satisty you.
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