GB/T 15442.3-1995 Fire performance classification and test methods of decorative fire retardant coatings Tunnel combustion method GB/T15442.3-1995 standard download decompression password: www.bzxz.net

e. coating ratio;
f. test results;
g. test personnel.
Additional notes:
This standard is proposed by the Ministry of Public Security of the People's Republic of China. 13. Fireproof materials
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. The main drafters of this standard are Chen Genbao, Shen Shufeng and Cheng Daobin. 10. "Fireproof 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 test temperature and humidity 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) 00
Tunnel furnace composition diagram
1-blowtorch; 2-thermocouple insertion hole; 3--test piece support: 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 100mm wide. The longitudinal direction of its plane forms an angle of 28° with the horizontal plane, which is the support of the test piece. The whole steel frame is welded on a steel base with a length of 610mm, a width of 250mm and a thickness of 12mm. The lower end of the angle steel frame is 185mm away from the base, and the upper end is about 480mm away from the base.
3.1.2 The flue end of the tunnel furnace is open; there is a 25mm diameter air supply hole at the center of the lower end of the tunnel furnace 110mm away from the base.
3.1.3 The heat-resistant glass plate observation window is located at the lower side of the specimen support. It is made of a piece of quartz glass or heat-resistant high-silicon glass with a length of 622mm, a width of 50mm and a thickness of 3mm. Marks are made on this glass at intervals of 25mm from 100mm to 500mm at one end. A metal light shield is set above the observation window with a downward tilt of 60'. Inside the specimen support is a serrated stainless steel calibration plate with a tooth spacing of 25mm. 3.1.4 On the side of the test plate support, above the center line of the blowtorch, there is a thermocouple insertion hole with a diameter of 3mm, through which the hot junction of the thermocouple is delivered to the back-fire surface of the test piece's ignition point. 3.1.5 The tunnel furnace should be placed in a room without forced ventilation. 3.2 Burner
3.2.1 The burner is a gas blowtorch with a top diameter of 20mm, a height of about 200mm, and an adjustable air intake hole. 3.2.2 The fuel can be natural gas, liquefied petroleum gas or city gas. The blowtorch should be adapted to the type of gas used so that it can inhale sufficient air to form a blue flame combustion state. 3.3 Ignitor
The ignition device is a high-voltage electric spark or other appropriate ignition device. 3.4 Cover
The cover is composed of an insulating asbestos board and a steel plate pressed on the asbestos board, and its dimensions are 600mm long, 90mm wide and 10mm thick
3.5 Temperature monitoring instrument
3.5.1 The flame center temperature is measured using an armored thermocouple with an accuracy of Class I, K division and an outer diameter of no more than 3mm. 3.5.2 The temperature recorder and the temperature digital display should match the thermocouple. The temperature recorder uses an electronic potentiometer with an accuracy of no less than 0.5 and can record continuously; the temperature digital display has an accuracy of 0.5% ± 1 character. 3.6 Timer
The timer is a quartz clock with the function of automatically ringing every 15 seconds. 4 Preparation of test pieces
4.1 Standard board and size
4.1.1 Asbestos standard board
The size of asbestos standard board is 600mm long, 90mm wide and 6~8mm thick. 4.1.2 Oak standard board
The oak standard board is 600mm long, 90mm wide and 8~10mm thick, with an air-dry density of 0.7~0.85g/cm3 (or wood of Fagaceae with similar air-dry density). The board surface is required to be flat and smooth, without knots and defects, and the texture should be consistent with the length direction of the board.
4.2 Selection and size of test substrate
The test substrate is a first-grade five-layer plywood with a thickness of (5±0.2)mm. The test board is 600mm long and 90mm wide. The surface of the test board should be flat and smooth, without knots and obvious defects. 4.3 Coating ratio
Thirteen, fireproof material 1039
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 shall be uniform. 4.4 State adjustment
After applying the fire retardant coating, the test piece shall be adjusted to a constant mass (the mass change of two weighings before and after 24h is not more than 0.5%) under the conditions of 23±2℃C and relative humidity (50±5)% specified in Article 3.1 of GB9278). 5 Test procedure
5.1 Calibration of the test device
Before the test, the test device shall be calibrated with a standard plate. During calibration, it is stipulated that the flame propagation ratio of the asbestos standard plate is "0" and the flame propagation ratio of the oak standard plate is \100\. 5.1.1 Open the gas valve, ignite the fuel gas, and adjust the gas supply. When the gas is liquefied petroleum gas, the supply volume is about 860mL/min [equivalent to (90±2) kJ/min]. The amount of air to be inhaled should be adjusted until the flame turns blue inside, and the middle flame temperature measured from the back temperature test point of the specimen should reach 900±20℃. Keep the system in working condition and close the gas switch valve. 5.1.2 Place the asbestos standard plate treated according to Article 4.4 with the smooth side facing down in the specimen holder; cover it with an insulating cover. 5.1.3 Open the adjusted gas valve of the blowtorch, ignite the fuel gas and start the timer at the same time, observe the expansion of the blowtorch flame along the bottom and side of the specimen, and record the distance length reached by the flame front every 15s until 4min, then close the gas switch valve and remove the cover and specimen in turn. bzxz.net
5.1.4 Take the average of the three adjacent maximum flame propagation readings as the flame propagation value (cm) of the asbestos test plate. The asbestos standard board should have at least two repeated test data of the test board. The average value of the flame propagation values ​​of the two test boards is the flame propagation value La (cm) of the asbestos standard board.
5.1.5 The oak standard board treated in accordance with Article 4.4 shall be tested according to the same operating procedures as the asbestos standard board to test the flame propagation value of the oak test board. The average value of the repeated test data of 5 test boards shall be the flame propagation value Lr (cm) of the oak standard board.
5.1.6 The correction constant of the tunnel furnace is calculated by formula (1): 100
L,- La
Where K is the correction constant of the tunnel furnace (cm-1); L, is the flame propagation value of the oak standard board (cm); La is the flame propagation value of the asbestos standard board (cm). 5.2 Determination of flame spread value of coated specimens
5.2.1 Place the coated specimens treated according to 4.4 in the specimen holder of the tunnel furnace with the coated surface facing downward, and conduct a combustion test according to the same operating procedure as the flame spread value determination of the asbestos standard board, and measure the flame spread value Ls (cm) of the coated test panel. 5.2.2 Each fire retardant coating sample should have at least 5 repeated test data of the specimens. 6 Calculation of flame spread ratio
6.1 The flame spread ratio of the test panel is calculated by formula (2): FSR=K(L La)
Wherein FSR--flame spread ratio of the test panel; (2)
Part I Test Methods for Major Building Materials Standards K---tunnel furnace calibration constant, (cm-1); Ls--flame spread value of the test panel (cm); La--flame spread value of the asbestos standard board (cm). 6.2 Calculate the average value of the flame spread ratio of the 5 repeated specimens, and take the integer as the flame spread ratio of the sample. 7 Test report
The test report of the tunnel combustion test shall include the following contents: a. Name and manufacturer of the fire retardant coating;
b. Production date and batch number of the fire retardant coating;
C. Name of the unit sending the sample;
d. Test time;
e. Coating ratio;
f. Test results;
g. Test personnel.
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 was formulated with reference to the American ASTMD3806 "Standard Test Method for Small-Scale Evaluation of Fire Retardant Coatings". The main drafters of this standard are Chen Genbao, Shen Shufeng, and Cheng Daobin. 11."Fire performance classification and test methods for decorative fire retardant coatings - small chamber combustion method" GB/T 15442.4-1995
1 Subject content and scope of application
This standard specifies the fire retardant performance of fire retardant coatings applied on the surface of combustible substrates under laboratory conditions (expressed as combustion mass loss and carbonization volume).
This standard is applicable to the determination of fire retardant 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 Small chamber combustion box
The small chamber combustion box is a metal plate box with glass doors and windows (see Figure 1) 3.1.1 The internal dimensions of the box are 337mm long, 229mm wide and 794mm high (including the extended smoke window and the top return air hood). 3.1.2 The gap between the return air hood and the smoke can be adjusted up and down to exhaust the smoke generated by combustion.
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