Mainly to test the tensile strength and elongation at b […]
Mainly to test the tensile strength and elongation at break of insulating and sheathed plastic materials, including before and after aging, as well as flexural test, bending test, load breaking core test, insulated core tear test for finished soft cable, Static bending test, etc. Tensile strength before and after aging, and elongation at break before and after aging are the most important and most basic indicators of wire and cable insulation and sheathing materials. It is required to be used as the material for wire and cable insulation and sheathing, and it must have sufficient tensile strength. It is easy to break and has certain flexibility.
Aging refers to the ability of insulation and sheath materials to maintain their original properties under high temperature conditions. Aging should not seriously affect the tensile strength and elongation of materials. It directly affects the service life of wire and cable. If the tensile strength and elongation at break are unqualified, it is very easy to break the sheath or insulator when the wire and cable is installed and installed, or the wire and cable used in light and heat environment. The sleeve and the insulation are easily brittle and broken, causing the live conductor to be exposed and the risk of electric shock.
In addition, since the flexible cable is not fixedly laid, there are repeated dragging and bending in use, so the soft cable standard is additionally provided with dynamic bending test, bending test, load breaking core test, and insulated wire on the finished wire and cable. Core tear test, static bending test, etc., to ensure that the cable meets the requirements in actual use.
For example, the dynamic flexural test mainly assesses whether the flexible cable is broken by the external mechanical tension and bending, whether the stranded wire of the soft conductor breaks to reduce the electrical transmission performance, or pierce the insulation to reduce the electrical properties of the insulation; A test method that is affected by stress is whether it is deformed or cracked and affects the electrical insulation properties of the cable.