Heat Shrink Tubing Glossary



Adhesive Bonded:
Cables bonded by adding an adhesive coating to the surface of the cable components, then joining and curing the adhesive to form a cable. See Bonded Cable.


Requirement for Soldering Fluxes, Association Connecting Electronics Industries / Replaced by 01-Jan-2004.
Revision A covers requirements for qualification and classification of rosin, resin, organic and inorganic fluxes according to the level and halide content of the fluxes. It includes solder fluxes, flux-containing materials and low residue fluxes for non-clean precesses.


American Society for Testing and Materials, American Standard Testing Method


ASTM D2671:
Standard Test Methods for Heat-Shrinkable Tubing for Electrical Use
These test methods cover the testing of heat-shrinkable tubing used for electrical insulation. Materials used include poly(vinyl chloride), polyolefins, fluorocarbon polymers, silicone rubber, and other plastic or elastomeric compounds.
The values stated in inch-pound units are the standard except for temperature, which shall be expressed in degrees Celsius. Values stated in parentheses are for information only.


ASTM D638:
Standard Test Method for Tensile Properties of Plastics
This test method covers the determination of the tensile properties of unreinforced and reinforced plastics in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment, temperature, humidity, and testing machine speed.


A device used to line an opening, which prevents abrasion to any wires and cables that are being passed through that opening.


Cable Sheath:
The overall protective covering applied to cables.


Damage to the surface of a metal by chemical reaction.


Covalent bonds linking one polymer chain to another. They have the characteristic property of thermosetting polymer materials.


The fractional increase in the length of a material stressed in tension.


Flame Resistance:
The ability of a material to not propagate flame once the heat source is removed.


The measure of a material's ability to support combustion.


Heat Distortion:
Distortion of the flow or configuration of a material due to the application of heat.


Hygroscopic: Capable of absorbing moisture from the air.


Insulating Joint:
A device, which mechanically couples and electrically insulates the sheath and armor of contiguous lengths of cable.


IPC J-STD-004:
Requirements for Soldering Fluxes, Association Connecting Electronics Industries / 38 pages, replaced by ANSI/IPC J-STD-004A.
Amendments: All current amendments are included with the purchase of this document.
Describes general requirements for classifying and testing of rosin, resin, organic and inorganic fluxes for high quality interconnections. This standard is a flux characterization, quality control and procurement document for solder flux and flux-containing materials of all compositions, including no-clean. Supersedes QQ-S-571 and MIL-F-14256. Co-produced with EIA. Amendment released April 1996.


An outer protective sheath over primary insulation, braids, shields, cable components, or over the cable itself. In fiber optics, a jacket is a covering over a single fiber, bundle of fibers or cable, which protects against the environment.


Joint industry standard Requirements for Electronic Grade Solder Alloys and Fluxed and Non-Fluxed Solid Solders for Electronic Soldering Applications.
Solder alloy quality (purity) is critical to successful soldering. Excessive impurities in a solder alloy will negatively affect solder joint formation, and ultimately solder joint quality and reliability. J-STD-006 Requirements for Electronic Grade Solder Alloys and Fluxed and Non-Fluxed Solid Solders for Electronic Soldering Applications is an important quality control document that describes requirements and test methods for electronic grade solder alloys. J-STD-006 is one of three documents related to soldering materials, the other two documents are J-STD-004 Requirements for Soldering Fluxes and J-STD-005 Requirements for Soldering Pastes


Kynar® :
Pennwalt trade name for polyvinylidene fluoride. Typically used as insulation for wire wrap wire.


Longitudinal Shield:
A tape shield, flat or corrugated, applied longitudinally with the axis of the core being shielded.


Longitudinal Wrap:
Tape applied longitudinally with the axis of the core being covered.


back up




Modulus of Elasticity:
The ratio of stress to strain in an elastic material.


Moisture Absorption:
The amount of moisture, in percentage, that a material will absorb under specified conditions.


Moisture Resistance:
The ability, of a material to resist absorbing moisture from the air, or when immersed in water.


A synthetic rubber with good resistance to oil, chemical and flame. Also called polychloroprene.


Oil Aging:
Cable aged in an accelerated manner by placement in an oil bath and heated to a pre­set temperature for a stated time.


Oxygen Index:
Percentage of oxygen necessary to support combustion in a gas mixture.


Reactive form of oxygen, typically found around electrical discharges and present in the atmosphere in small quantities.


Plastic Deformation:
A change in dimension that occurs when an object or material is under load, which is not recovered when the load is removed.


A chemical agent added to plastics to make them softer and more pliable.


Polyester: Polyethylene terephthalate, used extensively as a moisture-resistant cable core wrap.

Polyethylene: A thermoplastic material having excellent electrical properties.


A general name for polymers containing halogen atoms. The halogens are fluorine, chlorine, bromine and iodine.


A material of high molecular weight formed by the chemical union of monomers.


Any of the polymers and copolymers of the ethylene family of hydrocarbons.

A thermoplastic that is similar to polyethylene, with the exception of being stiffer and having a higher softening point (temperature); also possesses excellent electrical properties.


Multiple voids in an insulation cross- section.


back up


Pull Strength:
See Pull Tension.


Pull Tension:
The maximum pulling force that can be safely applied to a cable without damage.

Polyvinyl Chloride (PVC):
A general-purpose thermoplastic widely used for wire and cable insulations and jackets.


Rulan® :
DuPont's trade name for their flame- retardant polyethylene insulating material.


Secondary Insulation:
A nonconductive material that protects a cable’s conductor against abrasion and provides a second electrical barrier.


Selenium Cure:
Process used to cure neoprene and rubber-jacketed wires and cables.


Characteristic of a material whose flame is extinguished after the igniting flame source is removed.


A cable containing a flexible inner core and relatively inflexible sheathing.


An insulation cross-section having a partially open space between the conductor and the insulation perimeter.


A filament or group of filaments, such as fibers or wires, which are wound around a central core.


A wrapping applied over a wire or the core of a cable.


See Cable Sheath.


In cables, a metallic layer placed around a cable’s conductor to prevent electrostatic or electromagnetic interference between the enclosed wires or external fields.


Shield Coverage:
Amount of outer cable covered by the shielding material.


back up


A material made from silicon and oxygen, which can be found either in thermosetting elastomer form, which is noted for its high heat resistance, or as a liquid.


Silicone Treating:
A silicone liquid treatment applied to insulated conductors to allow for easy jacket stripping.


Specific Gravity:
The ratio comparing a material’s density (mass per unit volume) to that of water.


A joining of conductors, generally from separate sheaths.


Splice Closure:
A device used to protect a cable or wire splice.


Tear Strength:
The force required to initiate or continue a tear in a material under specified conditions.


Teflon® :
DuPont company trade name for fluorocarbon resins. FEP, PFA and TFE are typical materials.


Tefzel® :
DuPont trade name for a fluorocarbon material typically used as wire wrap insulation.


Temperature Rating:
The maximum temperature at which an insulating material may be used in continuous operation without loss of its basic properties.


Tensile Strength:
The pull stress required to break a given specimen.


Thermal Aging:
Exposure to a thermal condition or programmed series of conditions for preset periods of time.

A material, which softens when heated and becomes firm upon cooling.


A material, which hardens or sets when heat is applied, and which, once set, cannot be re-softened by heating. The application of heat is called "curing."


UL 224:
An Underwriters Laboratories standard that gives requirements for heat-shrink tubing, cross-linked tubing and insulating tubing made of extruded thermosetting, elastomeric, or thermoplastic polymers.


Wall Thickness:
The thickness of the applied insulation or jacket.


Water Absorption:
A test to determine the water absorbed by a material after a given immersion period.


back up