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Hot Set Test for Cross-Linked Materials in Cables

The Hot Set cable test is a straightforward means of determining if the material used in insulation or sheathing has been sufficiently cross-linked. A cross-linked material is one which has been altered to tighten and increase bonding between the polymer chains. When insulation and outer sheathing materials are cross-linked it is typically to improve mechanical and electrical properties. The cross-linking can be done either during polymerisation or post polymerisation.

Hot set testing for cross-linked materials is conducted in accordance with BS EN 60811-507, which provides the test methods for testing non-metallic materials of all types of cables. The approved test methods are intended to be referenced in standards for cable construction and for cable materials. 

Eland Cables undertakes hot set testing its cable portfolio as part of its rigorous quality assurance protocols, but The Cable Lab also offers this cable test as an independent service on cables from third-party sources.

Hot set testing is performed on the insulation or sheathing material and not on the complete cable so the first step is to prepare the cable sample by removing the conductors and any braiding, armouring or tapes. Depending on the cross-sectional size and shape of the overall cable, the samples are either cut as a tubular slice or cut into smooth dumb-bell shaped pieces. The central 20mm (or 10mm for smaller samples) is marked by two lines.

In addition to an oven capable of maintaining the required temperature within specified tolerances, the ISO 17025 test method requires grips with attachable weights.

The cable testing samples are suspended in the oven and weights attached to the end of the insulation material for a defined time and temperature, specified for each material type in the relevant standard. The samples are held at this temperature for a period of 10 minutes and the degree of stretch between the marker lines is determined. The force applied through the weight is then removed by cutting the sample at the point where the weight is attached and the samples are allowed to settle in the oven for a further 5 minutes weight-free. Once removed from the oven, the samples are then cooled slowly to ambient temperature and the marker lines measured again to determine how much each sample has recovered by. It should be noted that the ambient temperature is also determined by the ISO 17025 test methods in order to achieve continuity and consistency in results.

The mean values of 3 samples are recorded and compared against the standard requirements resulting in a pass or fail.

 

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The Cable Lab®

UKAS-accredited specialist cable testing laboratory

About Eland Cables

The Cable Lab® our in-house cable testing facility, is UKAS-accredited to ISO 17025, which is the single most important standard for calibration and testing laboratories around the world. Accreditation to this international standard demonstrates our laboratory's technical competence and the accuracy of its results.

For our customers, it means peace of mind. They can have full confidence in the quality of our products and can demonstrate due diligence in selecting their cable supplier.

Our customers can also rely on the Cable Lab's services for an independent, objective and comprehensive quality assessment of cables procured from third parties.

Read more...

About Eland Cables

About Eland Cables

Established in 1975, Eland Cables is a supplier of power, data, instrumentation and control cables and cable accessories to the world's most demanding industries and to some of its most prestigious projects. Our reputation is built on an unswerving focus on quality, technical expertise and customer service.

Quality

Our focus on quality has resulted in our in-house specialist cable testing facility securing the ISO 17025 accreditation. This certifies the competence, impartiality and performance capability of our laboratory and its evaluations. In turn, it means peace of mind for our customers with regard to the quality of the cables they source from us.

Expert tecHnical support

Our highly-qualified technical team is on hand to provide technical support with all aspects of cable selection, technical specification, regulatory requirements, and bespoke cable design and manufacture.

Complete Cable Solutions

We are a key contributor to projects in over 100 countries every year, adding value through comprehensive technical support, reliable logistics, innovative solutions, and a customer-centric approach.

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The Cable Lab®

UKAS-accredited specialist cable testing laboratory

About Eland Cables

The Cable Lab® our in-house cable testing facility, is UKAS-accredited to ISO 17025, which is the single most important standard for calibration and testing laboratories around the world. Accreditation to this international standard demonstrates our laboratory's technical competence and the accuracy of its results.

For our customers, it means peace of mind. They can have full confidence in the quality of our products and can demonstrate due diligence in selecting their cable supplier.

Our customers can also rely on the Cable Lab's services for an independent, objective and comprehensive quality assessment of cables procured from third parties.

Read more...