York Wire & Cable offers portable cords with both Thermoset and Thermoplastic constructions.  Thermoset (rubber) material hardens or sets under direct application of heat, and once it sets, is not able to be resoftened by heating.  Thermoset is a more durable compound than Thermoplastic.  Thermoset cords include the following types:

SOOW (Service, Oil Resistant Jacket, Oil Resistant Insulation, Weather Resistant)
               Has a tough, flexible Thermoset rubber jacket which is abrasion, sunlight,
               ozone, oil, and chemical resistant.  SOOW is also water submersible and
               flame retardant.  SOOW is designed for indoor and outdoor use with
               industrial equipment, heavy tools, battery chargers, portable lights, and
               power extensions.  SOOW meets CSA approval for outdoor use.

SJ      (Service, Junior)  Junior Service cord (300 Volt).  SJ has an all rubber
            construction, remains flexible at low temperatures, and is designed for indoor
            use with portable tools, equipment, and motors.

SV      (Service, Vacuum)  Junior light duty vacuum cord (300 volt).  SV remains
            flexible at low temperatures and is for use with vacuum cleaners and other light
            duty equipment.

SVO    (Service, Vacuum, Oil Resistant Jacket)  Same as SV, but jacket is oil
              resistant.

Themroplastic (plastic) material softens when heated and becomes firm upon cooling.  It is not as durable or as flexible as Thermoset material, but is much lighter in weight and offers excellent low temperature resistance.  Thermoplastic cords include the following types:

SEOW / STW  (Service, Thermoplastic Jacket, Oil Resistant Jacket, Weather
                          Resistant) Features a thermoplastic elastomer jacket and insulation,
                          which offer exceptional low temperature capabilities.  SEOW has an
                          oil resistant jacket, and is water resistant and extremely lightweight.
                          SEOW is suitable for outdoor use in industrial applications with
                          construction tools and other electrical equipment, but is not
                          recommended for contact with hot surfaces.  SEOW meets CSA
                          approval for outdoor use as STW.

STOW / STW  (Service, Thermoplastic Jacket, Oil Resistant Jacket, Weather
                         Resistant) Hard service thermoplastic cord which will deform under
                         extreme pressure or heat. STOW features an oil resistant jacket, and
                         is for indoor or outdoor use with heavy tools, equipment, portable
                         lights and power extensions.  STOW meets CSA approval for
                         outdoor use as STW.

STO  (Service, Thermoplastic, Oil Resistant Jacket) Same as STOW but for indoor
           use only.

STW  (Service, Thermoplastic, Weather Resistant)  Same as STOW but the jacket is
            not oil resistant.  STW meets CSA approval for outdoor use.

SVT  (Service, Vacuum, Thermoplastic)  Same as SV but with a thermoplastic
           insulation and jacket.