Typical Characteristics of Insulation & Jacket Compounds

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Abbr Name
CFEP Cellular Fluorinated Ethylene/Propylene copolymer
Cellular Fluorinated Propylene, expanded or "foam" FEP, consists of individual closed cells of inert gas suspended in a Fluorinated Ethylene/Propylene medium, resulting in a desirable reduction of the dielectric constant.
CPE Cellular Polyethylene
Cellular polyethylene, expanded or "foam" Polyethylene, consists of individual closed cells of inert gas suspended in a Polyethylene medium, resulting in a desirable reduction of the dielectric constant.
EPDM Ethylene-propylene-diene elastomer)
EPDM is a chemically cross-linked elastomer with excellent flexibility at high and low temperatures (150° to -55°C). It has good insulation resistance and dielectric strength, as well as excellent abrasion resistance and mechanical properties. EPDM also has better cut-through resistance than Silicone rubber, which it replaces in some applications.
FEP Fluorinated Ethylene/Propylene copolymer
This material has excellent electrical properties, temperature range and chemical resistance. It is not suitable where subjected to nuclear radiation and does not have good high voltage characteristics. FEP is extrudable in a manner similar to PVC and polyethylene. This means that long wire and cable lengths are available. TFE is extrudable in a hydraulic ram type process. Lengths are limited due to amount of material in the ram, thickness of the insulation, and preform size. TFE must be extruded over a silver or nickel-coated wire. The nickel and silver-coated designs are rated 260°C and 200°C maximum, respectively.
Thermoplastic fluoropolymer material with excellent chemical resistance, electrical properties, thermal characteristics, and impact resistance. The temperature rating is -70°C to 150°C.
The temperature range of this material can vary from -55°C to 90°C. The actual range would depend on the formulation used. Neoprene is both oil-resistant and sunlightresistant, making it ideal for many outdoor applications. The most stable colors are Black, Dark Brown, and Gray. The electrical properties are not as good as other insulation materials. Because of this, thicker insulation should be used. Typical designs where this material is used are lead wire insulation and cable jackets.
PE Polyethylene (Solid and Foam)
A very good insulation in terms of electrical properties. Low dielectric constant, a stable dielectric constant over all frequencies, very high insulation resistance. In terms of flexibility, polyethylene can be rated stiff to very hard, depending on molecular weight and density: low density being the most flexible, and high-density, high-molecular weight formulation being very hard. Polyethylene also has an excellent moisture resistance rating. Correct Brown and Black formulations have excellent weather resistance. The dielectric constant is 2.3 for solid insulation and 1.64 for foam designs. Flame retardant formulations are available with dielectric constants ranging from about 1.7 for foam flame retardant to 2.58 solid flame retardant polyethylene.
Polymer Alloy
Polymer Alloy is a plenum grade chloride-based jacketing material with low smoke and low flame spread properties. Cables jacketed with Polymer Alloy meet the UL Standard 910, Plenum Cable Flame Test.
PP Polypropylene (Solid and Foam)
Similar in electrical properties to polyethylene, this material is primarily used as an insulation material. Typically, it is harder than polyethylene. This makes it suitable for thin wall insulations. UL maximum temperature rating may be 60°C maximum. The dielectric constant is 2.25 for solid and 1.55 for foam designs.
PU Polyurethane
This material is used primarily as a cable jacket material. It has excellent oxidation, oil, and ozone resistance. Some formations also have good flame resistance. It is a sturdy compound with excellent properties, making it an ideal jacket material for retractile cords.
PVC Polyvinyl Chloride
Sometimes referred to as vinyl. Extremely high or low temperature properties cannot be found in one formulation. Certain formulations may have -55°C to 105°C rating. Other common vinyls may have -20°C to 60°C. The many varieties of PVC also differ in flexibility and electrical properties. The price range can vary accordingly. Typical dielectric constant values can vary from 3.5 to 6.5. (FR-PVC - Fire Resistant Polyvinyl Chloride)
PVDF Polyvinylidene Fluordide
  PVDF is a high-molecular-weight polymer with the predominant repeating unit ---CH2 ---CF2----. It is a crystalline material with an extremely high melting point. PVDF is used on cables meeting UL Standard 910, Plenum Cable Flame Test.
  The description of rubber normally includes natural rubber and SBR compounds. Both of these materials can be used for insulations and jackets. There are many formulations of these basic materials. Each formulation is for a specific application. Some formulations are suitable for -55°C minimum, while others are suitable for 75°C maximum.
  This is a very soft insulation which has a temperature range from -80°C to 200°C. It has excellent electrical properties plus ozone resistance, low moisture absorption, weather resistance, and radiation resistance. It typically has low mechanical strength and poor scuff resistance.
  Fluorocopolymer thermoplastic material having excellent electrical properties, heat resistance, chemical resistance, toughness, radiation resistance, and flame resistance. The temperature rating is -65°C to 150°C.

Hypalon and Tefzel is a registered trademark of DuPont
Silicone is a registered trademark of General Electric
Halar is a registered trademark of Ausimont Corporation

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