GB/T 15442.2-1995 Classification and test methods of fire performance of decorative fire retardant coatings Large plate fuel method GB/T15442.2-1995 standard download decompression password: www.bzxz.net

Part 1 Testing methods for main building materials Additional notes:
This standard is proposed by the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the Seventh Subcommittee of the National Fire Protection Standardization Technical Committee. This standard was drafted by the Sichuan Fire Science Research Institute of the Ministry of Public Security. This standard is formulated with reference to the "American Fire Regulations" NFPA703 "Standard for Fireproof Impregnated Wood and Fireproof Coatings for Buildings". The main drafters of this standard are Chen Genbao, Shen Shufeng, and Cheng Daobin. 9. "Fireproof Performance Classification and Test Methods of Decorative Fire Retardant Coatings Large Panel Burning Method" GB/T15442.2--1995
1 Subject content and scope of application
This standard specifies the test of the flame retardant properties of fire retardant coatings applied to the surface of combustible substrates under specified conditions. This standard is applicable to the determination of the flame retardant properties of decorative fire retardant coatings. 2 Reference standards
GB 9278 Temperature and humidity for coating sample state adjustment and test 3 Test equipment
3.1 Test device
The test device consists of a test piece rack, a burner, a jet aspirator, etc. (see Figure 1). 3.1.1 The test rack is a frame made of 30mm×30mm angle steel, and its internal dimensions are 760mmrm×760mm×1400mm. The lower end of the frame has a foot height of 100mm, and the upper end is used to place the test piece.
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Figure 1 Test device
1—Test piece; 2—Asbestos pressure plate; 3—Thermocouple; 4--Test rack; 5—Burner; 6~Fuel gas regulating valve; 7--Jet aspirator; 8--Blower; 9-Air regulating valve 54mm, center aperture 14mm.
3.1.5 The air volume of the blower is 1~～5m2/mino3.1.2 The asbestos pressure plate is made of 900mm×900mm×20mm asbestos plate, with a circular hole of 500mm in diameter in the center.
3.1.3 The burner is composed of two copper sleeves with an inner diameter of 42mm, a wall thickness of 3mm, a height of 42mm and an inner diameter of 28mm, a wall thickness of 3mm, and a height of 25mm, and is installed on a reducer straight-through pipe joint with a nominal diameter of 40mm×32mm. The distance from the burner port to the test piece is 730±6mm.
3.1.4 The jet aspirator consists of a reducing tee pipe joint with a nominal diameter of 32mm×32mm×15mm and a nozzle screwed into one end of the tee pipe joint. The nozzle is 3.2 Control device
3.2.1 Thermocouple
Thirteen. Fireproof materials
Temperature monitoring uses thermocouples with an accuracy of Class II and K graduation. Among them, armored thermocouples with an outer diameter of no more than 3mm are used for flame temperature monitoring; thermocouples with a wire diameter of no more than 0.5mm are used for the back-fire surface temperature test of the specimen, and their hot contacts should be welded at the center of a copper sheet with a diameter of 12mm and a thickness of 0.2mm. 3.2.2 Temperature recorder and temperature digital display The graduation number of the temperature recorder and temperature digital display should match the selected thermocouple. The temperature recorder is an electronic potentiometer for continuous recording, with an accuracy of not less than 0.5 level (the flame temperature test can be carried out with an accuracy of 1 level); the temperature digital display has an accuracy of 0.5% ± 1 word.
3.3 Timer
The timer uses a quartz clock or a stopwatch, with a timing error of no more than 1s/h and a reading resolution of 1s. 3.4 Fuel
The fuel uses commercially available liquefied petroleum gas or natural gas. 3.5 Test room
The test room is divided into a combustion room and a control room, with an observation window between the two rooms. The length, width and height of the combustion room are limited to 3 to 4.5m, and the distance from the test frame to any part of the wall shall not be less than 900mm. During the test, there should be no external airflow interference. 4 Preparation of test pieces
4.1 Selection and size of test substrate
The test substrate is a first-level five-layer plywood, the substrate thickness should be controlled at 5±0.2mm, and the test board size is 900mm×900mm. The surface should be flat and smooth, and ensure that there are no joints or knots in the plane 250mm from the center of one side of the test plate. 4.2 Coating ratio
The wet coating ratio of the test piece is 500g/m2, and the coating error is ±2% of the specified value. If it is necessary to apply in batches, the interval between two coatings shall not be less than 24h, and the brushing should be even. 4.3 State adjustment
After applying the fire retardant coating, the test piece should be adjusted to a constant mass under the conditions of temperature (23±2)C and relative humidity (50±5)% specified in Article 3.1 of GB9278 (the mass change between two weighings 24h apart shall not be greater than 0.5%). 5 Test procedure
5.1 Check whether the thermocouple and each instrument are working properly. 5.2 Place the state-adjusted test piece horizontally on the test stand, with the side coated with the fire retardant coating facing down, the center of the test piece facing the burner, and the asbestos pressing plate on its back. 5.3 Place the armored thermocouple for measuring flame temperature horizontally under the specimen, with its hot junction 50mm away from the center of the fire surface of the specimen (during the test, if the thickness of the bubble layer due to coating expansion is greater than 50mm, it is allowed to move the thermocouple vertically downward until the hot junction is exposed from the bubble layer). Then place the copper sheet surface thermocouple for measuring the back-fire surface temperature at the center of the back-fire surface of the specimen, and cover the copper sheet with a 30mm×30mm×2mm asbestos board. The asbestos board should be close to the back of the specimen and fixed in an appropriate manner. No other objects are allowed to be pressed.
5.4 Turn on the temperature recorder and fan first, then turn on the air control valve and gas control valve, and ignite. Press the timer button while igniting the fuel gas. Observe the test phenomenon and record the flame temperature and the back-fire surface temperature of the specimen every 2 minutes. 1036
Part 1 Testing methods and standards for main building materials When the test is carried out for 5 minutes, if the gas is liquefied petroleum gas, the supply should be (16±0.4)L/min (equivalent to 1632～1716kl/min). Then adjust the air supply to control the flame temperature. The whole test process is heated according to the requirements of the time-temperature standard curve TT(C)
Figure 2 Time-temperature standard curve
Temperature rise T- T.
line. When the temperature of the back-fire surface of the test piece reaches 220℃ or the back-fire surface of the test piece is penetrated, close the gas valve and record the combustion test time (min).
5.5 The flame temperature during the entire test process is calculated according to formula (1): T - To = 345log1o(8t + 1)bZxz.net
Wherein, T -
is the flame temperature at t (℃);
To is the ambient temperature at the beginning of the test (℃); (min)
- the time of the test (min).
represents the function curve of the above formula, that is, the time-temperature standard curve, as shown in Figure 2, and its corresponding representative values ​​are shown in Table 1: Temperature rise table changing with time
Temperature rise TT.
Temperature rise T-To
Temperature rise-To
The allowable deviation of the area under the time-temperature curve measured in the test and the area under the time-temperature standard curve is: a. ±10% within the first 10 minutes of the test; 6. ±5% within the range from 10 minutes to 30 minutes of the test. 5.6 After each test, the next test shall be conducted only when the room temperature drops below 40℃. 5.7 Repeat the test for 3 specimens, and take the average value of the burning time of the 3 specimens as the integer as the flame retardant time (min) of the fire retardant coating.
6 Test report
The test report of the large panel combustion test shall include the following contents: a. Name and manufacturer of the fire retardant coating;
6. Production date and batch number of the fire retardant coating;
c. Name of the unit sending the sample;
d. Test date;
e. Coating ratio;
f. Test results;
g Test personnel.
Additional remarks:
This standard is proposed by the Ministry of Public Security of the People's Republic of China. Materials
Thirteen, fire protection
This standard is under the jurisdiction of the Seventh Subcommittee of the National Technical Committee for Fire Protection Standardization. This standard was drafted by the Sichuan Fire Science Research Institute of the Ministry of Public Security. The main drafters of this standard are Chen Genbao, Shen Shufeng and Cheng Daobin. 10. "Fire performance classification and test methods of decorative fire retardant coatings-tunnel combustion method" GB/T15442.3-1995
Subject content and scope of application
This standard specifies the flame propagation characteristics of fire retardant coatings applied on the surface of combustible substrates under laboratory conditions using a small tunnel furnace.
This standard is applicable to the determination of flame propagation performance of decorative fire retardant coatings. 2 Reference standards
GB9278 Conditioning of coating sample state and temperature and humidity of test 3 Test equipment
3.1 Tunnel furnace
The tunnel furnace is composed of angle steel frame and ceramic fiber board (or asbestos cement board) (see figure) 100
Tunnel furnace structure diagram
1-blowtorch; 2-thermocouple insertion hole; 3-test piece bracket; 4-glass observation window; 5-igniter 6-air supply hole; 7 frame; 8-fuel gas pipe; 9-base The angle steel frame is welded by 25mm×25mm×3mm angle steel. The top of the angle steel frame is 610mm long and 3.1.1 wide.
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