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Oil resistant

Cables demonstrating various degrees of oil resistance are specified for use in a number of applications such as railways, shipbuilding, offshore platforms and wind turbines.  

Often the most difficult performance parameter for the cable sheath is the retention of mechanical properties after immersion in IRM902 and IRM903 oils at elevated temperatures.  Standards for offshore drilling rigs may also require resistance to oil drilling muds which can be more demanding in this respect.  Cables used in these applications also have the added difficulty of having to be installed and to operate in very cold climates.

Some typical standards are;

  BS7655-1.4 2000   Insulation and sheathing for cable elastomeric cables 
  BS7655-1.5 2000   Insulation and sheathing for cables - coil end leads 
    BS7655 2.0 2000    Sheathing compounds for ships wiring and offshore applications 
  BS7655 2.6 1997   Ordinary duty oil resisting types 
  EN50305 2002    Railway rolling stock cables - thin wall 
  EN50264-1    Railway rolling stock cables - standard wall
  IEC 60092-359   Sheathing materials for shipboard power and telecom cables 


These types of cable are usually made using rubber as the sheathing and insulation.  However, there are a number of companies who are keen to enter this market who do not have the use of the continuous vulcanisation (CV) line necessary to cure the rubber.  In addition, even in those companies that have this technology, there can be a shortage of capacity and it is expensive to install more.


SX-0620 is a new grade of crosslinkable oil resistant sheathing compound, which has exceptional resistance to IRM902 and IRM903 and, at the same time, is flexible even at cold temperatures.  It employs the sioplas crosslinking technique, which also means that it can be processed on conventional cable extrusion equipment.


An added benefit is that because the sioplas process is a low pressure process, it is not necessary to use hard rubber insulated cores to avoid deformation during the CV process.  If the applicable standard allows sioplas crosslinked or even thermoplastic insulated conductors, these can be used instead, thus making important savings on processing costs and possibly CV capacity.

If the construction of the cable is two layer, with an inner insulating layer and an outer to provide the oil resistance, the inner layer can be without flame retardancy and SX554 is an ideal flexible choice.  If the construction requires additional fire performance then SX-0612 is recommended or SX559 for the highest fire performance.

Grades available

Density
(g/cm2)

Tensile
strength
(Mpa)

Elongation
at break
(%) 

Oil resistance
Min days with 60% property retention

Limiting oxygen
index
 

Data
sheet

 IRM902 at 100°C

IRM903 at 70°C

 Oil resistant products

 SX-0620:CM601  Oil resistant flexible silane crosslinkable HFFR sheathing  

1.48

10

170

7

32

Data sheet icon

 Complimentary products
 SX-0612:CM601  Halogen free flame retardant silane crosslinkable insulation

1.47

13

180

-

-

33

Data sheet icon

 SX559:CT08-81A  Halogen free flame retardant silane crosslinkable insulation

1.49

14

165

-

-

36

Data sheet icon

 SX554:CM493  Flexible silane crosslinkable EPR insulation

0.90

9

420

-

-

-

Data sheet icon

Please note that all of the silane crosslinkable grades are shown as a system with a graft and a catalyst.  These are normally used in the ratio of 95:5.  The most common catalyst masterbatch is shown in the table but there are others available which helps us to more accurately match your property requirements and processing conditions.