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Rail Pads
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Rail Pads :: Product Details
:: Customer Base
:: Tests & Certificates

The key superior feature of this rail pad is:-

1.      Reduces vibration and impact transmission from rail to sleeper by providing resilience and impact attenuation.

2.      Give adequate resistance to longitudinal and rotational movement of rail.

3.      Ensures long life- Minimum 10 years.

4.      Properties are stable over a wide range of operating temperatures during life.

5.      It does not deform, abrade or move out of fastening system under dynamic loads.

6.      It is not adversely affected by ozone, ultra violet light , oils and related chemicals.

7.      Reduces possibility of rail foot corrosion and concrete sleeper erosion

8.      Provides more resistance to longitudinal rail movement due to creep or thermal expansion.

9.      Provides electrical résistance between rail and sleeper

10.  Provides conforming layer between rail and sleeper to avoid contact areas of high pressure.


The design , material of the pad and vulcanizing process need to be given due consideration so as to obtain the fine balance between resilience and damping , creep properties and fatigue life of the rubber. The above mentioned salient advantages are obtained by adopting a multi pronged approach as briefly given below:-

a)      Optimized shape factor: The ratio of loaded area to the force free area has been optimized after computer simulations,

b)      Right ingredients: natural rubber RMA 1X which is completely free from dust, particles of bark of rubber trees etc. is used instead of RMA IV specified in IR specification along with synthetic rubber.

c)      Right Vulcanizing agent. : Our vulcanizing agent does not leave any free sulphur practically after vulcanizing, which in other cases continues the vulcanization process in service and results in premature ageing.

d)      Anti-degradants: A mix of anti oxidant, anti ozonants , anti flex resistant chemicals are used. This is in addition to protective agents against heat.

e)      Fillers: Only reinforcing fillers are used.

f)        Coupling Agent: These chemicals assure a chemical bond between rubber and the reinforcing filler instead of physical bond.

g)   Optimum vulcanizing Process : the rate of heating and cooling during the process of vulcanization play an important role in obtaining the final product. These have been properly designed and followed to obtain the improved rail pad.


Comparative Data

Australian Specification 33A issue 07 for Rail Pad

Sl. No. Properties   Australian Specification Observed Value
1. Dimension & Visual check   Drawing Enclosed VP-2668B
2. Hardness (Shore 'A')   68±5 70
3. Tensile Strength (Kg/      
  (a) Before ageing   170 (min.) 186
  (b) After ageing at 100 ±°C for 96+ 0/-2 hrs.     154
(c) % Retention after ageing 83%
4. Elongation at Break(%) 300(min.) 320
(a) Before ageing 224
(b) After ageing at 100 ±°C for 96+ 0/-2 hrs. 70%
(c) % Retention after ageing
5. Relaxed Modules at 100% elongation
(a) Before ageing (Kg/ 50
(b) Change after ageing at 100± 1°C for 96+0/-2 hrs 26%
6. Compression Set (a) 25% strain constant at 70°C for 22 hrs. 30% (max) 25%
(b) 25% strain constant at 23°C for 70hrs. 20% (max) 18%
7. Tension set 50% Strech (%) at 100±1°C for 24+0/-2 hrs. 22
8. Load Compression Test At 18-90 KN 68 KN/mm
At 70-90 KN 222KN/mm
9. Electrical Resistance 1 x 10 12 Ω cm at 100V DC  38.5 x 1012
10. Ash content (%)   20% 18%
11. Specific Gravity 1.18
12. Heat Build - up Test 10°C (ASTM d623)


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