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Industrial Technologies
SterilTR Industrial Technologies

Polymer Crosslinking for tubes foams cables and wires

Radiation modification of polymer materials means useful directional change of their properties as a result of irradiation.

high temp cableRadiation modification of polymer materials means useful directional change of their properties as a result of irradiation. Due to the high molecular weight of the polymer low radiation doses, the most commonly used, can cause a significant change in polymer properties.
 
In practical terms the most important transformation in polymers is crosslinking. Crosslinking is used in a variety of industrial processes such as the modification of polyolefin (preferably polyethylene and PVC) insulation cables and wires, heat shrinkable films and tubes production, vulcanization of elastomers and their products (components of tires, rubbers etc.).
Radiation crosslinking began more than 50 years ago when it was discovered that polyethylene (PE) could be crosslinked by means of radiation processing.
 
Crosslinking is the process that links the molecules in a wide meshed three-dimensional structure through the formation of crosslinks.
 
Radiation doses for crosslinking are usually lie in the range from 50 to 150 kGy. Multifunctional monomers can be mixed with the polymer to increase the G(X) value and reduce the dose requirement. Antioxidants, UV stabilizers and flame retardant compounds can be added to improve the performance of the material for particular applications. Such additives may inhibit the crosslinking effect, so the properties of commercial materials are usually different from the pure polymers.
 
The electron beam crosslinking of the insulation jacketing on wire and cable is one of the most well established industrial uses of EB processing. Crosslinking prevents insulation from dripping off an over-heated wire, as could result from a short circuit, or when exposed to the high heat of an automotive engine or even a fire.

crosslinked foam 


Polyethylene, polyvinylchloride, ethylene-propylene rubber, polyvinylidene fluoride and ethylene tetrafluoroethylene copolymer are some of the materials used in this application. Increased tolerance to overloaded conductors and high temperature environments, fire retardation, increased abrasion resistance, increased tensile strength, reduction in cold flow and increased resistance to solvents and corrosive chemicals are product improvements obtainable by this method.
 

Mainly crosslinked

Polyethylene
Polyacrylates
Polyvinyl chloride
Polysiloxanes
Polyamides
Polystyrene
Polyacrylamides

 cable crooslink method

 

 

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