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Explanation of technical terms related to Heat Shrinkable Cable Accessories

2022-12-19
There are many professional terms involved in the relevant technical documents of the Heat Shrinkable Cable Accessories. They are used as the proof parameters that the Heat Shrinkable Cable Accessories meet the technical requirements, which can make people understand the relevant indicators of the product at a glance. The following is the main common terms of Heat Shrinkable Cable Accessories.

1. Hardness: It is a physical measure of the degree of compression deformation or the ability to resist puncture. Shore hardness refers to the worth reading measured by Shore hardness tester. The description method A and D are two kinds, respectively representing different hardness ranges. Shore A hardness tester is used for testing below 90 degrees, and Shore D hardness tester is used for testing above 90 degrees.

2. Fracture strength: refers to the maximum stress of material fracture.

3. Elongation at break: the ratio of the displacement value of the sample to the original length when it breaks. Expressed as a percentage (%)

4. Oxygen index: it refers to the minimum oxygen concentration required for flame-burning of materials in the oxygen-nitrogen mixed air flow under specified conditions; Expressed as a percentage of the volume occupied by oxygen; The higher the oxygen index, the better the flame retardancy.

5. Dielectric strength: A measure of the electrical strength of a material as an insulator. It is defined as the maximum voltage per unit thickness when the sample is broken down, expressed as volts per unit thickness; The greater the dielectric strength of a substance, the better its quality as an insulator.

6. Dielectric constant: also known as medium permanence, dielectric coefficient or capacitance, it is a coefficient of insulation capacity characteristics, expressed by the letter ε, unit is method/meter (F/m).

7. Electric trace: that is, the fine, wire charring trace formed on the surface of the insulating (or protective) material by the arc of sufficient energy, and cause the increase of leakage current and then form a destructive channel.

8. Needle insertion degree: the depth of the standard cylinder into the grease sample held at 25℃ within 5 seconds. The unit is 1/10 of a millimeter; The greater the needle penetration, the softer the grease is. On the contrary, the harder the grease is, the greater the consistency is.
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