Electroinsulating ceramic forming tubes ETEK and ETEX
Scope of application
As an electrical insulation, fire - and heat-resistant protective shell of power current-carrying cables, cores, safety wires in particularly critical areas, for example, fire alarms, connections to fire warning systems. ETEK and ETEX tubes are ideally suited as a protective shell that can withstand the action of fire in case of fires, providing reliable insulation of the conductor.
Operating principle
The ETEK tube made of a ceramic-forming rubber compound creates an electrical and thermal barrier. When exposed to high temperatures (fire) on the ceramic-forming silicone rubber, a mineral strong ceramic-like dielectric layer is formed on the surface of the conductive cores, which ensures the operability of the fire-resistant cable in fire conditions. The rubber compound used in the production of ETEK and ETEX pipes is characterized by a very low content of harmful substances in the combustion products as a result of flame exposure, does not create an aggressive environment, and forms a strong, dense hydrophobic ceramic-like layer. The ceramic layer formed by the combustion of organosilicon rubber is not conductive even at high temperatures.
Technical specifications
Parameters |
Result, not less than * |
Hardness, units Shore A |
65 |
Nominal tensile strength, MPa |
6,5 |
Elongation at break, % |
250 |
Specific volume electrical resistance, Ohms * cm |
≥1015 |
Dielectric strength, kV / mm |
≥22 |
Operating temperature range, 0C |
-60÷+300 |
Maintenance of working capacity during flame exposure, min (according to GOST IEC 60331-23-2011) |
180 |
Standard color |
** |
* The data shown in the table are for informational purposes only and are typical characteristics of the material and cannot be used for drawing up technical specifications.
** The color of ETEK and ETEX tubes depends on the brand of rubber compound used and is specified when ordering
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The ceramic coating formed when exposed to fire has high insulation and mechanical characteristics and meets the requirements of the international standards NFC 32070CR1, BS 6387 class Z, EN 50200.