I. Scope of Application

1.1 It is applicable to the test for evaluating the surface combustion performance of materials by radiant heat flux.
1.2 ZY6125-PC, also known as radiant plate heat flux tester, is one of the most widely used methods for determining flame propagation performance in laboratories. The specimen is placed at a 30° Angle to the radiation plate, 120mm from the upper edge and 340mm from the lower edge of the radiation plate. The ignition source is a medium-sized gas blowtorch. The blowtorch is a 230mm long ceramic tube with a diameter of 6mm, placed at an Angle of 15° to 20° to the test piece. During the test, the specimen is exposed to the heat source of the radiation plate and a medium-sized blowtorch for up to 15 minutes. After the specimen is ignited, the time it takes for the flame front to reach the reference mark is recorded. In the experiment, the amount of heat radiation released by the flue gas, the smoke concentration, the droplets from combustion and the flame spread index Is were recorded. Calculate the radiation plate index Is equal to the factor Fs of sample flame spread multiplied by the factor Q of heat change, that Is, Is=Fs * Q
1.3 This testing machine can also be used to evaluate the flame spread performance of components such as interior panels, ceilings, sound insulation materials, Windows, door lintels, and seat side panels of trains in accordance with the NFPA 130 standard for flame retardancy of rail vehicles in the United States. Judgment criteria: The test duration should be no more than 15 minutes, or the flame should reach 380mm at the reference mark.
Ii. Compliance with Standards
2.1 Comply with ASTM E 162-08B "Standard Test Method for Surface Flammability of Material Using a Radiant Heat Energy Test Method for Evaluating the surface burning performance of materials using radiant heat sources.
Iii. Main Parameters
3.1 Radiation Section:
3.1.1 Radiant panel: Composed of porous refractory materials, the exposed size of the radiant panel is 305mm×457mm, and it can withstand temperatures above 815℃. 3.1.2 Air compressor: Generates an air flow rate of 3000L/min; The air pressure is 2.8 inches of water column (700Pa).
3.1.3 Gas Supply pipeline: Install air filters, pressure regulators and stop valves to regulate the gas flow
3.1.4 Ignition System: High-voltage electronic ignition;
3.2 Sample Holder:
3.2.1 Sample holder: Made of heat-resistant chromium steel, with a 3-inch (76mm) interval line observation mark engraved on the surface of the sample holder. 3.2.2 Support frame for the sample holder: This frame will have two stainless steel crossbars, each with a diameter of 0.5±0.13 inches (12.7±3.3mm), allowing the sample to be directly fixed in front of the radiation plate. The supports and support components are made of metal. Since the installation Angle between the sample and the radiation plate is of crucial importance, the specified dimensions of the frame are made strictly in accordance with the dimensions marked in ASTM E162-08b as shown in Figure 1, and the tolerance is controlled within 0.125 (3.2mm).
3.3 Test blowtorch: Outer diameter ￠4.8mm, inner diameter ￠3.2mm, length 205mm. To extend the service life of the test blowtorch, a porcelain tube sleeve was installed on the part of the blowtorch exposed to the radiation source. The inner diameter of the porcelain tube is 5.2mm and the outer diameter is 7.14mm. The blowtorch is installed horizontally and placed at an Angle of 15° to 20° to the horizontal plane of the sample. When not in use, the blowtorch can be removed. The blowtorch is composed of a Venturi mixer, where acetylene and air are pre-mixed in the Venturi. The flame height of the combustion burner is 76mm, and the distance between the burner and the central surface of the upper part of the sample is 12.7mm.
3.4 Chimney: Made of 0.040-inch (1.0mm) stainless steel plate, the shape and size are as shown in Figure 1. The installation position of the chimney with the sample and the radiation plate is strictly designed in accordance with Figure 1.
3.5 Thermocouples: Eight thermocouples are installed at equal intervals and in parallel on the chimney. The installation positions are shown in Figure 1. K-type stainless steel armored thermocouple with a diameter of 3.2mm; The temperature-sensing wire is 0.5mm and can measure a maximum temperature of 1200°C. The verification of the rated unit heat output of the blowtorch is carried out by regularly calibrating the temperature of the thermocouple on the chimney, and the verification procedure is executed in accordance with A1.2.
3.6 Data Acquisition System:
3.6.1 Collect and record the real-time temperature curves and data of the thermocouple on the chimney from 38°C to 538°C, with a collection frequency of once every 5 seconds.
3.6.2 Computer data acquisition system: The accuracy of temperature acquisition is 0.01%
3.6.3 The frequency of all data collection, recording and storage shall be once every 5 seconds and continuously for one hour.
3.7 Exhaust hood: Install an exhaust hood with a fan on the smoke and dust. When the radiant panel is not in operation, the fan at the top of the chimney can produce a wind speed of 100 feet per second (0.5M/S) (30.5M) per minute. When the radiant panel is in operation, the fan can generate approximately 250 feet per minute (78M/min).
3.8 Radiation Pyrometer:
3.8.1 Adopt high-precision radiation pyrometers from Swiss KELLER Company;
3.8.2 Measuring range: (480-530) ℃ blackbody temperature;
3.8.3 Measurement Accuracy: ±0.3℃
3.8.4 Sensitivity: Constant within the wavelength range of 1 μ m to 9 μ m;
3.8.5 Installation position: Approximately 1.2 meters away from the radiant panel, capable of sensing temperature to a circular surface with a diameter of 254mm above the radiation.
3.8.6 The calibration of the blackbody temperature range and procedures of the radiation pyrometer shall be carried out in accordance with Appendix A1.
3.9 Timer: Resolution 0.01min, accuracy 1 second /h.
3.10 Heat flux meter
3.10.1 Measuring range: (0-15) Kw/m ²
3.10.2 Accuracy of heat flux meter: ±0.2Kw/m ²;
3.10.3 Heat flux meter accuracy: <±3%;
Iv. Equipment Structure
4.1 The structure of this machine consists of two parts: the combustion box and the control box.
4.2 Material of control box/combustion box: Made of high-quality stainless steel plate, processed by CNC machine tools, with an elegant and generous arc shape.
4.3 Other mechanical parts are made of high-quality stainless steel or A3 material with thickened electroplating to prevent corrosion and rust.
V. Control System:
5.1 Control Mode: The board card module I/O board is adopted, with PID+SSR control mode. The acquisition system can collect and record the CHF value of the radiation flux curve, as well as the flame extinction time and the distance of flame propagation.
5.2 Status Value display: The software automatically has the status recognition function for conducting tests, such as when the heat flow rate meets the standard requirements; 5.3 Heat Flow meter calibration procedure, step-by-step calibration;
5.4 Printing of record, test and calibration reports; Record and print data every 5 seconds (at least within 1 hour);
5.5 Computer: One laptop

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CHENFENG TESTING EQUIPMENT CO., LTD (DAXIAN INSTRUMENT EQUIPMENT CO., LTD) is Located in Changan Town (Dongguan City ,Guangdong Province, China),a famous historical town with prosperous industry and convenient transportation.

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