Insulation & Sheath Material options
Polyvinyl Chloride（PVC）
PVC is the most widely used material throughout the cable industry because of its good mechanical and
electrical properties,combined with cheap cost. The three most common materials used are PVC (-20℃ to 80℃),
PVC AF which is flame retardant (oxygen index >32% and halogen content<18%.)
Polyethylene(PE)
PE has excellent insulation characteristics and is used for data and RF transmission. It is very resistant to water
penetration and thus used as sheath for outdoor/underground cables.It has three major types.ie.Low, (LDPE)
medium (MDPE) and high (HDPE). Generally speaking, the higher the density, the better the mechanical
performance.Callular polyethylene has even lower capacitance than solid PE and is used for low loss data cable.
Nylon(PA)
Nylon has excellent abrasion and chemical resistance and is an excellent sheathing material.It is however,less
flexible than other materials.
Fluoropolymer(PTFE/FEP/ETFE)
The three most common materials used are polytetrafluorethylene (PTFE) (-80℃ to 260℃), fluorethylene-
propylene (FEP) (-80℃ to 205℃) and ethylenetetrafluorethylene (ETFE) (-80℃ to 155℃)
These materials are usually used in aerospace industry where wide temperature range is required.
Low Smoke Halogen Free (LSHF)
It is a flame retardant compound designed to reduce both the spread of fire and the volume of toxic gas and
smoke during fire.It is usually used in Mass Transit Railway,banking and high rise building.
Lowe Smoke and Fume (LSF)
These materials differ from the LSHF materials in their fire retardancy and gas emission characteristics. In
general, these materials are graded by their hydrogen chloride emission charaterstics usually between 5 per
cent and 15 percent emissions for the LSF materials as compared to 0.5 per cent for the LSHF materials.
Elastomeric Compound
They have excellent thermal stability and also makes the cable flexibie.The most common material are EPR and
XLPE. Both of them are used for insulation material in low and medium voltage cables.
Polypropylene(PP)
It exhibits same electrical characteristics of PE but has better mechanical and temperature properties.It is
usually used for small cables with thin sheath and overall diameter.
UV Stabiliser
With the inclusion of UV Stabiliser such as carbon back compound in the formulation,PE exhibits extremely good
aging properties and high UV and weather resistance whereas PVC or LSHF have improved resistance to
degradation from exposure to UV radiation.