This standard specifies the test device, test steps and result calculation of the oxygen index method, one of the test methods for the combustion performance of glass fiber reinforced plastics. This standard is applicable to the determination of the minimum oxygen concentration required for the continuous combustion of the sample of glass fiber reinforced plastics under the conditions specified in this standard, which is expressed as the volume percentage of oxygen. This standard is only applicable to the evaluation of the combustion performance of materials under the conditions specified in this standard, but cannot evaluate the fire hazard under actual use conditions. GB 8924-1988 Test method for combustion performance of glass fiber reinforced plastics Oxygen index method GB8924-1988 standard download decompression password: www.bzxz.net

Part 1 Testing methods and standards for main building materials 6 Test report
The test report shall include the following contents:
a. Identification characteristics of materials: name, brand, batch number, molding process, production unit, etc. b. Sample resin content.
c. Sample size and state adjustment.
d. Average burning time (t, s).
e. Average ablation length (L, mm).
f. Average ablation percentage mass loss (W, %). g. Combustion phenomenon.
h. Test date and personnel.
Additional remarks:
This standard was proposed by China State Shipbuilding Corporation and is under the jurisdiction of the National Technical Committee for Standardization of Fiber Reinforced Plastics. This standard was drafted by Luoyang Ship Material Research Institute of China State Shipbuilding Corporation and Beijing Fiberglass Research Institute of State Building Materials Bureau.
The main drafters of this standard are Guo Mingzu, Li Shumei and Qiu Hongying. 20. "Glass Fiber Reinforced Plastic Combustion Performance Test Method Oxygen Index Method" GB8924--88
1 Subject content and scope of application
This standard specifies one of the test methods for the combustion performance of glass fiber reinforced plastics - test steps and result calculation.
Test device and test of the oxygen index method
This standard is applicable to the determination of the minimum oxygen concentration required for the continuous combustion of the sample of glass fiber reinforced plastic under the conditions specified in this standard, which is expressed as the volume percentage of oxygen. This standard is only applicable to the evaluation of the combustion performance of materials under the conditions specified in this standard, but cannot evaluate the fire hazard under actual use conditions.
2 Reference standards
GB1446 General principles for fiber reinforced plastics performance test methods GB2577 Test method for resin content in FRP GB2576 Test method for insoluble content of resin in FRP 3 Test specimens
3.1 Dimensions
The length of the test specimen is 70~150mm, the width is (6.5±0.5)mm, and the thickness is (3±0.5)mm. Test specimens of other thicknesses can also be tested, but the test results can only be compared at the same thickness. 3.2 Preparation
The preparation of test specimens shall comply with the provisions of Chapter 1 of GB1446. 3.3 Quantity and appearance inspection
Each group of test specimens shall not be less than 5.
The appearance inspection shall comply with the provisions of Article 2.1 of GB1446. 3.4 Deviation of resin content and degree of curing
Thirteen, fireproof materials
The difference between the maximum and minimum values ​​of the resin content in each group of samples should not be greater than 4%, and the degree of curing should be greater than 80%, which can also be in accordance with the provisions of product standards or technical specifications.
The resin content is measured in accordance with GB2577, and the degree of curing is measured in accordance with GB2576. 3.5 State adjustment
According to Article 3.2 of GB1446.
4 Test equipment
4.1 Fume hood
The test is carried out in a fume hood with an observation window. 4.2 Oxygen Index Tester
The tester is shown in Figure 1 and includes the following components:
Figure 1 Schematic diagram of oxygen index tester
1-base; 2-glass beads; 3-metal mesh; 4-sample clamp; 5-sample; 6-combustion cylinder; 7-igniter; 8-gas mixer; 9-pressure gauge; 10-oxygen cylinder; 11-nitrogen cylinder; 12-pressure regulator; 13-regulating valve; 14-rotameter 4.2.1 Combustion cylinder: a heat-resistant glass tube with an inner diameter of 75*mm and a height of 450±5mm. Glass beads with a diameter of (4±1)mm are filled at the bottom and the height is (100±5)mm. A metal mesh is placed above the glass beads to receive the drippings from the burning sample. The flow rate of the mixed gas in the cylinder is (4±1)cm/s. 4.2.2 Sample clamp: Installed at the axial center of the combustion cylinder to keep the sample in a vertical state. 4.2.3 Gas supply system: It is composed of oxygen cylinder, nitrogen cylinder, pressure gauge, pressure regulating valve, valve and hose. 4.2.4 Measurement system and control system: It is composed of oxygen flow meter, nitrogen flow meter (the minimum scale of flow meter is 0.1L/min), gas 1094
Part 1 Standard test methods for main building materials body mixer, pressure gauge, pressure regulating valve, regulating valve, cleaner and pipeline. In addition, each flow meter must be calibrated once a year. 4.2.5 Ignitor: A nozzle with an inner diameter of 1 to 3mm at the tip. The flame length can be controlled at will, and it can enter the top of the combustion tube to ignite the sample. The heat source is liquefied petroleum gas, natural gas, coal gas, etc. (In case of dispute, butane gas shall prevail). 4.3 Others
4.3.1 Stopwatch: accuracy 0.1so
4.3.2 Vernier caliper: accuracy 0.02mmc5 Test steps
Test the samples whose curing degree and resin content meet 3.4 according to 5.1~5.7. 5.1 Measure the thickness d of the sample with an accuracy of 0.05mm. 5.2 Before the test, turn the valve to check whether there is air leakage at the connection. 5.3 Install the sample vertically on the sample clamp. The distance from the upper end of the sample to the top of the cylinder is not less than 100mm. 5.4 Select the initial oxygen concentration of the sample based on experience or the combustion of the sample in the air. If it burns quickly in the air, it is less than 18%; if it does not ignite in the air, it is more than 25%. 5.52 The flame length of the igniter is 15~25mm. 5.6 Adjust the flow valve so that the oxygen and nitrogen mixed gas flowing into the combustion tube reaches the required oxygen concentration, and ensure that the flow rate of the gas in the combustion tube is (4±1) cm/s. After letting the gas pass through the combustion tube for 30 seconds, ignite at the upper end of the sample. When the upper end of the sample is indeed ignited, remove the fire source and immediately start recording the time and observing the combustion conditions (including carbonization, melting, bending, dripping, smoldering, flame and smoke size, color, post-combustion stratification and flame distribution). 5.7 Repeat the operations of α and b below to measure the lowest oxygen concentration when the sample burns for more than 3 minutes three times, that is, the oxygen concentration value of α, but the difference between α and b should be less than 0.5%. During the combustion process, the flow rate cannot be changed, and the ventilation system cannot be opened.
a. If the sample burns for more than 3 minutes, reduce the oxygen concentration. b. If the sample burns for less than 3 minutes, increase the oxygen concentration. 6 Calculation
Oxygen index 0.1. Calculate according to formula (1):
0.1.=[0,]+N, ×100
Wherein OI—-oxygen index (%);
[O,]——oxygen flow rate (L/min);
[N2]——nitrogen flow rate (L/min). 7 Test results
7.1 Oxygen index value of each specimen.
7.2 Arithmetic mean, take one decimal place. 8 Test report
The test report should include the following:
Thirteen, fireproof materials
Q. Identification characteristics of the specimen: name, number, base material brand, molding process, providing unit, etc.; 6. Sample size and state adjustment;
c. Sample average resin content W (%);
d. Sample average curing degree C. (%);
e. Oxygen index value and average value of each sample;f. Test environment;
g. Combustion state;
h, test date and personnel.
Additional remarks:
This standard is proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Fiber Reinforced Plastics. This standard is drafted by Luoyang Ship Material Research Institute. 1095wwW.bzxz.Net
21. "Test Method for Combustion Performance of Flame Retardant Paper and Paperboard" GB/T14656-931 Subject content and scope of application
This standard specifies the test method for the combustion performance of flame retardant paper and paperboard under specific conditions. This standard is applicable to paper and paperboard with a thickness of less than 1.6mm and that has been flame retardant treated, and is also applicable to flame retardant paper products with a thickness of less than 1.6mm that have been coated or printed. 2 Terminology
2.1 Afterflame time The time that the sample continues to burn with flame after the burner flame is removed, in seconds (s). 2.2 Afterburning time The time that the carbonized part of the sample continues to burn after the sample stops burning with flame, in seconds (s). 2.3 Carbonization length The maximum length of the carbonized part of the sample along the long side of the sample after the combustion test, in millimeters (mm).
2.4 Flame retardant paper Paper, paperboard and paper products that have been treated with flame retardant. 2.5 Non-water-resistant flame retardant paper refers to flame retardant paper whose flame retardant properties cannot meet the requirements of Article 6.1.2 after being immersed in water. 2.6 Water-resistant flame retardant paper refers to flame retardant paper whose flame retardant properties meet the requirements of Article 6.2.2 after being immersed in water. 3 Test apparatus and instruments
3.1 Test apparatus
Mainly composed of a combustion box, a control box and a gas supply system (see Figure 1). 3.1.1 The combustion box
consists of a box body, a sample fixing device, a burner, etc. (see Figure 2). 3.1.1.1 The box is made of 2mm thick stainless steel plate. The overall dimensions are 305mm×355mm×760mm. There is a glass door on the front of the box, and 16 ventilation holes with a diameter of 12.5mm are evenly distributed on the top plate of the box (see Figure 3). There are 8 ventilation holes with a diameter of 12.5mm on each side of the box, and the center of the hole is 25mm away from the lower edge.
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