Remark:
The UL910/NFPA262 Steiner horizontal tunnel furnace is mainly used for the flame retardant performance test of CMP-level wires and cables, and is mainly used for cables in horizontal subsystems that are directly laid in ventilated or forced ventilation environments without using metal pipelines.
This flame-retardant test standard represents the most stringent flame-retardant test standard for UL and even the entire wire and cable flame-retardant test. Only cables with a fluorine material sheath can pass the flame-retardant test method. Due to the high decomposition temperature (more than 400 degrees) and high ignition point (above 800 degrees) of fluoroplastics, it is not easy to burn when the fire is low, so it has better fire resistance than other organic materials.

Standard :
Testing apparatus for ASTME 84,UL910,NFPA262 .

Technical parameters of tunnel furnace:

1. The combustion box is made of stainless steel, with refractory bricks laid inside; it has good heat preservation performance. The internal size of the combustion box is 305mm x 451mm, and the length is 7.6m;
2. The internal fixtures are made of SUS304 stainless steel, which is anti-rust and anti-corrosion;
3. The double-layer quartz glass observation window can observe the spreading distance of the flame, and display the position of the flame through the indicator light, and the record is more intuitive.
4. The height of the combustion box is suitable for personnel to watch the combustion status and installation, and adjust the sample;
5. The combustion box cover adopts the overall design, and adopts the water tank sealing design according to the standard, equipped with 2mm thick 304 stainless steel water sealing tank to ensure that the flue gas does not leak during the test.
6. The box cover is made of refractory and stainless steel. The box cover is equipped with a hook and a lifting device;
7. The sample holder is equipped with a cooling water circulation support holder, which is resistant to high temperatures and can support burning covers such as calcium silicate boards;
8. The upper cover of SUS304 stainless steel heat preservation machine body is filled with heat-resistant heat preservation material
9. Equipped with an escalator-type sample installation platform to facilitate installation, installation and removal of samples and furnace maintenance;
10. Stainless steel exhaust pipes are beautiful and corrosion-resistant;
11. Independent multifunctional exhaust pressure detection device: real-time monitoring of changes in exhaust pressure during the test. The detection range is 0～250Pa, the accuracy is ±0.5Pa, and the system pressure test accuracy is ±2Pa;
12. Fan: 380V, 50Hz, 3Kw equipped with frequency converter can change the wind speed. The maximum flow rate is at least 8000m3/h, which can discharge the flue gas generated by the bad combustion of the sample to the outdoors in time to ensure the safety of the test;
13. Double-head copper gas burner: the burner is 1320mm away from the air inlet, and can output standard 5.3MJ/min heat. According to different standards, the gas flow can be controlled by a mass flowmeter. The measuring range is 0～160L/min, which can be changed. The calorific value output of the burner, the maximum output energy can reach 100MJ/min;
14. Automatic ignition system: to ensure the safety performance of the test, high voltage igniter, 12KV, 50mA, the minimum high voltage of the ignition electrode is 1.8kVp;
15. Smoke density system: Provide a separate signal processing system to ensure that the sensor is linear;
16. Automatically record temperature and flue gas sensor signals, sample collection frequency is 1Hz;
17. Mass flow controller: SUS316 stainless steel material, maximum pressure 1000psi (70bar), leakage rate less than 1×10-7ml/s, NIST calibration, 0～5VDC and 4～20mA signal, loop protection, propane flow range 0～ 2.3g/s, control speed ≤2s, control accuracy within the range of 0.6～2.3 g/s is ±1%FS, repeatability ±0.5FS, temperature range 0～50℃, humidity range 0～90%, digital display, automatic During the control test, the gas supply meets the heat requirement of 5000Btu (5.3MJ)/min, and the software automatically records the amount of gas used;
18. Standard test software, which can automatically record system wind speed, temperature, smoke density and other test data.

Auxiliary device:
- Tap water source system
- Methane combustion gas system
- Car lifting system

1. Fire Testing Equipment

2. Building Material Fire Tester

3. Wire and Cable Fire Tester

4. Environmental Test Chamber

5. Textile Testing Equipment

6. Plastic Testing Equipment

7. Tensile Testing Machine