Fillers, Binders & Identification Methods

Fillers are generally used for three reasons:

1. To fill gaps in a cable for a more attractive appearance.

2. To create and maintain a sequence or lay-up of components.

3. To add strength to a cable.

Types of Fillers


Solid Plastic

Typically PVC,

and to a lesser degree, Polyethylene. These fillers are available

in any size and are commonly used in the cores of many cables.



These fillers

are used extensively in power cables (SJT, SVT, etc.). They are

available in flame moisture resistant versions.


Foamed & Fibrillated Polypropylene

Used mainly

for the ability to mold to the gap to be filled. These are the

most commonly used cable fillers for computer based cable.


Cotton, Rayon

Cotton or

rayon fillers are used as a good middle choice between solid and

fibrillated polypropylene fillers due to their “filling” ability

and low cost.



Used mainly as

a strength member, Kevlar is very expensive and should be used

when longitudinal strength is required. Kevlar is commonly used in

Fiber Optics cables to improve impact and strain resistance.

Types of Binders



Polyester and

polypropylene tapes are commonly used to hold cable bundles

together and are frequently used to provide isolation between

conductors and shields.


Nylon & Textile

Nylon binders

are mainly used when flexibility of a cable must be maintained.

They are also used in telephone cables to separate bundles and are

supplied color coded for that purpose. Textiles can be braided or


Cable Identification Methods


ID Threads


manufacturing company has identification threads which can be run

inside the cable should the need arise to identify the



Printed ID Types

ID tapes with

a manufacturer’s legend printed with appropriate UL and CSA

information can be run in the cable.


Surface Marking

a) Indent

Print – Physical impressions of appropriate information in the

cable jacket.

b) Surface Ink – Inked information on the jacket surface.

c) Embossed Legend – Raised lettering on the cable jacket.

d) Sequential Printing – Printing occurs every foot in ascending

numerical order.