JB/T 9141.7-1999 JB/T 9141.7-1999 Determination of thermal weight loss of flexible graphite sheet JB/T9141.7-1999 Standard download decompression password: www.bzxz.net

1C521.140
Machinery Industry Standard of the People's Republic of China
JB/T9141.7-—1999
Flexible graphite sheets
Test method for loss of weight by heated offlexiblcgraphitesheets
Published in 1999-0G-28
National Bureau of Machinery Industry
Implementation on 2000-01-01
JERT9141.7-1999
The small standard is a revision of the 7RJ22015-89 "Test method for loss of weight by heated offlexiblcgraphitesheets". During the revision, the original standard was systematically modified and the main technical contents were changed. This standard replaces 2BJ22U15-1999, and this standard is proposed by the Sealing Standardization Technical Committee of Zhejiang University. The drafting units of this standard are: Jiji University, Zhejiang Huixi Sealing Materials Co., Ltd. This standard requires: Li Ruzhen, Qiu Kuanheng, Shi Jiqun. Scope
Chinese and national mechanical industry standards
Flexible graphite sheets:
Test method fnr Ias at weigbt hy heated offlexible graphite sheets
JB/T9141.7-1999
Find ZB[22015-89
The standard specifies the equipment for measuring the thermal loss of graphite sheets, the sample preparation method, the test steps and the calculation of the test results. This standard is not applicable to the determination of the thermal loss of flexible graphite sheets. 2 Method Summary
The dried sample is burned in a furnace at 450 or 60°C for 1 hour, and the percentage of thermal weight loss is calculated by the largest weight loss box. 3 Instruments and equipment
a) Standard sieves: 12 and 32 sieves;
h) Electric constant temperature drying box;
c) Sieve:
d) Balance: Sensitivity is 0.0002; e) Dryer:
Stainless steel scissors, porcelain square.
4 Sample requirements and preparation
4.! The sample of the plate to be inspected shall not be less than , and its surface shall be free of dust and oil pollution. 4.2 Take a small solid point sample equidistantly along the diagonal force direction of the plate to be inspected, and its total weight shall not be less than 40. Use four to sort a sample into two parts, one for the sample and the other for the reserved sample. 4.3 Cut the sample into pieces with scissors, use a 12-mesh standard sieve to remove the fine particles that pass the 32-mesh standard sieve. 4.4 Dry the prepared sample in an oven at 105-110℃, and cool it in a refiner for use. 5 Test steps
5.1450% heat loss test step
Weigh 1-1.2g (accurate to 0.0002) of the sample and place it in a muffle furnace pre-burned at 800℃. To a constant weight of porcelain square, place in a muffle furnace of 450T±10T, close the furnace door and burn for 1h, take out, cool for [.-2min, move to a desiccator and cool for 30min, weigh.
5.2 The test procedure for heat loss at 600°C is the same as 5.1, except that the test temperature is 60+0.05°C. Approved by the State Machinery Industry Bureau on June 28, 1999, and implemented on January 1, 2000
6 Test results and calculation
JB/T 9141.7—1999
6 Calculation of heat loss percentage (%) by formula (): GG
Where: CE—sample weight before burning, CE—sample weight after burning.
×100%
6.2450 It is a heat head weight belt to carry out a group of sample determination, 600% heat loss weight step by step to carry out a group of parallel can be completed, take the arithmetic flatness of the point as the determination result, retain one significant figure: 6.3 Allowable error
The test error shall not exceed the range specified in the table! Otherwise, the reverse determination should be updated. "Tolerable error range"
Test sample
Not included
The test report
The test result should include the following contents:
a) Indication of the test standard:
The average value and the other two estimates are compared, and the deviation is 0.05%
b) Material specifications, brand, and manufacturer; c) Sample number and number: bzxz.net
d) Test temperature:
c) Test results:
Determination personnel, period,
The average value is estimated
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