Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 6628-1993
Flexible Graphite Composite Reinforced (Plate) Pad
Published on 1993-05-07
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Flexible Graphite Composite Reinforced (Plate) Pad
1 Subject Content and Scope of Application
JB/T 6628-1993
This standard specifies the product codes and markings, technical requirements, test methods and inspection rules for flexible graphite composite reinforced pads (hereinafter referred to as composite pads) and flexible graphite composite reinforced plates (hereinafter referred to as composite plates). This standard applies to flexible graphite composite reinforced pads and flexible graphite composite reinforced plates. Reference standards
GB2828
GB2829
GB12385
GB/T12621
JB/T6613
JB/T6622
JB/T6623
ZB J22 009
ZBJ22012
ZBJ22015
Product classification
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Count sampling procedure and sampling table for periodic inspection (applicable to inspection of intermittent batches)Sealing performance test method for gaskets for pipe flangeStress relaxation test method for pipe flange gaskets
Classification, code and marking of flexible graphite sheets and stripsDetermination method of chlorine content in flexible graphite sheets
Determination method of sulfur content in flexible graphite sheets
Determination method of density of flexible graphite sheets
Test method of compression rate and rebound rate of flexible graphite sheetsDetermination method of thermal weight loss of flexible graphite sheets
Classification and marking of composite (sheet) pads shall be in accordance with JB/T6613, see Table 1. Table 1
Flexible graphite, metal tooth plate composite reinforcement (plate) pad Flexible graphite, asbestos, metal tooth plate composite reinforcement (plate) pad Ministry of Machinery Industry 1993-05-07 Approved
Product mark
JB/T6613RSB1222
JB/T6613RSB1222 (S)
Flexible stone quantity
Metal tooth plate
Flexible graphite
Metal tooth plate
1994-01-01 Implementation
Flexible graphite, metal flat plate composite reinforcement (plate) pad Flexible graphite, fiber mixed composite reinforcement (plate) pad Flexible Flexible graphite, fiber mesh multilayer composite reinforced (plate) pad 4
JB/T6628-1993
Continued Table 1
Product marking
RSB1232
JB/T6613
JB/T6613
RSB1804
JB/T6613RSB1815
Flexible graphite
Metal flat plate
Flexible graphite
Fiber mesh
The sulfur content of flexible graphite used in composite (plate) pads should not exceed 1500ppm, and the chlorine content should not exceed 100ppm. 4.12
4.2 The performance of other materials used in composite (plate) pads should comply with the relevant standards. 5
Technical requirements
Technical requirements for composite pads
The technical requirements for composite plates for composite pads shall comply with the provisions of Article 5.2. The inner and outer circumferences of the composite pads shall be neat, and the appearance quality shall comply with the provisions of Articles 5.2.1 and 5.2.2. The dimensions and limit deviations of the composite pads shall comply with the relevant standards. The sealing leakage rate of the composite pads shall be less than 1.0x10-3cm2/s. 5.2 Technical requirements for composite plates
The surface of the composite plate shall be flat, without obvious impurities, cracks, wrinkles, scratches and other defects. For double-sided composite plates or multi-layer composite plates, the metal core plate or fiber mesh shall be well bonded with the flexible graphite layer; for fiber-mixed composite plates, the fibers shall be evenly mixed with the flexible graphite, and no obvious fiber clusters shall appear. 5.2.3
The allowable deviation of the thickness of the composite plate is shown in Table 2. wwW.bzxz.Net
≤500
JB/T6628-1993
The physical and mechanical properties of the composite board shall comply with the provisions of Table 3 and Table 4. Table 3
Density deviation
Compression rate
Resilience rate
Stress relaxation rate
Loss at temperature
Oil absorption rate
Density deviation
Compression rate
Resilience rate
450℃
600℃
Stress relaxation rate
Loss at temperature
Oil absorption rate
Thickness deviation
Physical and mechanical properties of metal composite board
RSB1222
Physical and mechanical properties of fiber composite board
Thickness difference of the same sheet
RSB1222 (S)
RSB1804
RSB1232
RSB1815
Test method
6.1 Dimension measurement of composite pad
JB/T 6628-1993
The dimensions of composite pad shall be measured with a vernier caliper with an accuracy of 0.02mm, accurate to 0.1mm. The inner and outer diameters of the composite pad shall be the arithmetic mean of the measured values at three points of equal arc. The thickness of the composite pad shall be the arithmetic mean of the measured values at three points evenly arranged along the circumference. 6.2
Composite gasket sealing performance test The composite gasket sealing performance test is carried out in accordance with GB12385. The test conditions should comply with the provisions of Table 5. Table 5
Test conditions
Test overflow ℃
Preload specific pressure MPa
Medium pressure MPa
Test medium
6.3 Composite plate thickness deviation and thickness difference test RSB1202, RSB1815
99.9% nitrogen
RSB1804
6.3.1 At 3cm from the edge of the composite plate, measure the thickness of each point with a micrometer at uniform intervals of 10 to 15cm, accurate to 0.01mm. The arithmetic mean of the measured values at each point is the thickness of the sample. 6.3.2 The difference between the measured thickness and the nominal value of the composite plate thickness is the thickness deviation. 6.3.3 The difference between the maximum and minimum values of the measured values at each point of each sample is the thickness difference of the same sheet. 6.4 Composite board density deviation test
The apparent density test of composite board shall be carried out in accordance with the provisions of ZBJ22009. 6.4.2
The difference between the measured sample density and the nominal density of the composite board is the density deviation. 6.5 Composite board compression rate and rebound rate test
6.5.1 Samples and their preparation
On the extracted composite board, cut 50mmx50mm samples. The edges of the samples should be neat, without wrinkles, delamination, scratches, obvious impurities and other defects. Each group of samples should be no less than 3.
6.5.2 Test conditions
The test conditions should comply with the provisions of Table 6.
Metal composite reinforced plate
Fiber mesh composite reinforced plate
Fiber mixed composite reinforced plate
Indenter diameter
6.5.3 Test equipment and devices, test procedures and test result calculation
Except the indenter diameter and test load, the test equipment and devices for compression rate and rebound rate test of composite plate, test procedures and test value calculation of single specimen4
JB/T 6628-1993
The test value calculation shall be carried out in accordance with the provisions of ZBJ22012. Each specimen shall be tested at one point in the center. The test results shall be expressed as the arithmetic mean of the test values of each group of specimens, with two significant figures.
6.6 Composite plate stress relaxation test
The composite plate stress relaxation test is carried out according to GB/T12621 method A. 6.7 Composite plate heat resistance loss determination
6.7.1 Sample requirements
The sample size is 50mmx25mm, and the sample surface should be free of dust and oil pollution. Each group of samples is not less than 3. Before the test, the sample should be dried in an electric constant temperature drying oven at 100±5℃ for 1h. 6.7.2 Test conditions
The test conditions should comply with the provisions of Table 7.
Flexible graphite metal composite reinforced board
Flexible graphite organic fiber composite reinforced board
Flexible graphite inorganic fiber composite reinforced board
3 Test equipment and test steps
450 (or according to actual requirements)
600 (or according to actual requirements)
The test equipment and test steps for the determination of heat loss of composite board shall be carried out in accordance with ZBJ22015. 6.7.4 Test results and calculation
The heat loss of a single sample is calculated according to formula (1): Heat loss = GG
Where: G——sample mass before burning, g; G——sample mass after burning, g.
x100%..·
The test results are expressed as the arithmetic mean of a group of samples, retaining three significant figures. 6.8 Determination of oil absorption rate of composite board
Method Summary
Place the dried sample in the selected oil and soak it for a certain period of time. Calculate the oil absorption rate as the percentage of the increased mass to the original mass. 6.8.2 Instruments and equipment
6.8.2.1 Electric constant temperature drying oven:
Analytical balance: Sensitivity is 0.0002g:
Drying oven;
6.8.2.4 Constant temperature oil bath.
6.8.3 Test conditions
The test conditions shall comply with the provisions of Table 8.
70# gasoline
0# diesel
20# mechanical lubricating oil
6.8.4 Sample and its preparation
JB/T6628-1993
Test temperature
21~29
150±5
The sample should be free of defects such as delamination and wrinkles, and the surface should be free of dust and oil pollution. 6.8.4.2 The sample size is 50mmx25mm, and each group of samples is not less than 3. Test time
6.8.4.3 Bake the prepared sample in an electric constant temperature drying oven at 100±5℃ for 1h, and put it in a desiccator to cool to room temperature. 6.8.5 Test steps
6.8.5.1 Weigh the dried sample to an accuracy of 0.001g. 6.8.5.2 Immerse the weighed sample in the oil specified in 6.8.3. The sample should be immersed in the oil, and there should be no bubbles on its surface. The samples should not touch each other or the container wall. 6.8.5.3 After the gasoline and diesel test samples are immersed in the oil for the specified time, take them out, dry the surface with filter paper, and weigh them immediately to an accuracy of 0.001g. If volatile oil is used, the sample should be placed in a weighing bottle for weighing after immersion. 6.8.5.4 For engine oil test, 30 minutes before the sample is immersed in the oil for the specified time, take the sample out from the hot engine oil and quickly immerse it in normal temperature engine oil. Take it out after the specified time, dry the surface with filter paper, and weigh it immediately to an accuracy of 0.001g. 6.8.6 Test results and calculations
1 The oil absorption rate of a single sample is calculated according to formula (2): 6.8.6.1
Where: W. —Oil absorption rate of a single sample, %; G,
Mass of sample after oil immersion, 9;
Mass of sample, g.
6.8.6.2 The test results are expressed as the arithmetic mean of a group of samples, with two significant figures. The determination of sulfur content in flexible graphite for composite plates shall be carried out in accordance with JB/T6623. 6.9
The determination of chlorine content in flexible graphite for composite plates shall be carried out in accordance with JB/T6622. 6.11
The appearance quality of composite (plate) pads shall be visually inspected. Inspection rules
Composite (plate) pads shall be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory. 7.2 Product inspection is divided into factory inspection and type inspection. 7.3 The sampling method for composite (plate) pads is random sampling in the warehouse. 7.4 Factory Inspection
7.4.1 The factory inspection items for composite mats are the items specified in Articles 5.1.1 to 5.1.3, and the factory inspection items for composite boards are the items specified in Articles 5.2.1 to 5.2.3.
7.4.2 The composite (board) mats are inspected in batches per shift and sampled according to the single sampling plan of GB2828. The general inspection level IL is 6
JB/T6628-1993
I, and the qualified quality level AQL is 10. Appearance quality adopts full inspection, 7.5 Type inspection
When one of the following situations occurs,
Type inspection should be carried out:
Test new products:
Product structure, materials, processes, etc. have changed significantly; Continuous production time is more than 6 months;
Suspension time exceeds 3 months:
Factory inspection results are significantly different from the last type inspection; The superior quality supervision agency requires type inspection. The type inspection items of composite pads shall be in accordance with Article 5.1; the type inspection items of composite boards shall be in accordance with Article 5.2. The sampling procedure and judgment rules shall be implemented in accordance with GB2829. A single sampling plan is adopted, the RQL value is 30, and the discrimination level is II. Packaging, transportation and storage
Marks,
The packaging box of composite (board) pads should indicate: a.
Product name;
Product trademark:
Manufacturer name;
Gross weight, net weight:
Manufacturing date or production batch number;
"Moisture-proof\" words and marks.
Composite (board) pads are packed in wooden boxes lined with waterproof paper, and it should be ensured that they will not be damaged or lost during transportation and storage. A packing list should be attached to the packaging box, which should indicate: Product Name:
Product trademark;
Manufacturer name:
Product quantity;
Product specifications;
Manufacture date.
The package box should be accompanied by a product certificate, which should indicate: Product name:
Product trademark:
Product mark;
Batch number:
Standard number:
Manufacture date and validity period:
g.Manufacturer name:
h. Inspector name or code
JB/T 6628-1993
8.3 Transportation and storage 8.3.1
Composite (plate) pads must be protected from rain and moisture during transportation. 8.3.2 Composite (plate) pads should be stored in a clean, ventilated and dry warehouse. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wu Suyun and Wang Qiang. People's Republic of China
Mechanical Industry Standard
Flexible Graphite Composite Reinforced (Plate) Pad
JB/T 66281993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing
Postal Code: 100044)
Format: 880×1230
Printing Sheet: 3/4
Word Count: 16,000
First Edition in October 1993
First Printing in October 1993
Print Quantity: 1-500
Price: 5.00 Yuan
Mechanical Industry Standards Service Network: http://www.JB.ac.cn8992 The test results are expressed as the arithmetic mean of a group of samples, with two significant figures. The sulfur content of flexible graphite for composite plates shall be determined in accordance with JB/T6623. 6.9
The chlorine content of flexible graphite for composite plates shall be determined in accordance with JB/T6622. 6.11
The appearance quality of composite (plate) pads shall be visually inspected. Inspection rules
Composite (plate) pads shall be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory. 7.2 Product inspection is divided into factory inspection and type inspection. 7.3 The sampling method of composite (plate) pads is random sampling in the warehouse. 7.4 Factory inspection
7.4.1 The factory inspection items for composite pads are the items specified in Articles 5.1.1 to 5.1.3, and the factory inspection items for composite plates are the items specified in Articles 5.2.1 to 5.2.3.
7.4.2 Composite (board) pads are inspected in batches per shift, and are sampled and inspected according to the one-time sampling plan of GB2828. The general inspection level IL is 6
JB/T6628-1993
I, and the qualified quality level AQL is 10. The appearance quality adopts full inspection. 7.5 Type inspection
When one of the following situations occurs, type inspection should be carried out:
Testing new products:
The product structure, materials, and processes have changed significantly; The continuous production time is more than 6 months;
The suspension time exceeds 3 months:
The factory inspection results are significantly different from the last type inspection; The superior quality supervision agency requires type inspection. The type inspection items of composite pads shall be in accordance with Article 5.1; the type inspection items of composite boards shall be in accordance with Article 5.2. The sampling procedure and judgment rules shall be implemented in accordance with GB2829. A single sampling plan is adopted, with an RQL value of 30 and a discrimination level of II. Packaging, transportation and storage
Marking,
The packaging box of the composite (board) pad should indicate: a.
Product name;
Product trademark:
Manufacturer name;
Gross weight, net weight:
Manufacturing date or production batch number;
"Moisture-proof\" words and marks.
The composite (board) pad is packed in a wooden box lined with waterproof paper, and it should be ensured that it will not be damaged or lost during transportation and storage. The packaging box should be accompanied by a packing list, which should indicate: Product Name:
Product trademark;
Manufacturer name:
Product quantity;
Product specifications;
Manufacture date.
The package box should be accompanied by a product certificate, which should indicate: Product name:
Product trademark:
Product mark;
Batch number:
Standard number:
Manufacture date and validity period:
g.Manufacturer name:
h. Inspector name or code
JB/T 6628-1993
8.3 Transportation and storage 8.3.1
Composite (plate) pads must be protected from rain and moisture during transportation. 8.3.2 Composite (plate) pads should be stored in a clean, ventilated and dry warehouse. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wu Suyun and Wang Qiang. People's Republic of China
Mechanical Industry Standard
Flexible Graphite Composite Reinforced (Plate) Pad
JB/T 66281993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing
Postal Code: 100044)
Format: 880×1230
Printing Sheet: 3/4
Word Count: 16,000
First Edition in October 1993
First Printing in October 1993
Print Quantity: 1-500
Price: 5.00 Yuan
Mechanical Industry Standards Service Network: http://www.JB.ac.cn8992 The test results are expressed as the arithmetic mean of a group of samples, with two significant figures. The sulfur content of flexible graphite for composite plates shall be determined in accordance with JB/T6623. 6.9
The chlorine content of flexible graphite for composite plates shall be determined in accordance with JB/T6622. 6.11
The appearance quality of composite (plate) pads shall be visually inspected. Inspection rules
Composite (plate) pads shall be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory. 7.2 Product inspection is divided into factory inspection and type inspection. 7.3 The sampling method of composite (plate) pads is random sampling in the warehouse. 7.4 Factory inspection
7.4.1 The factory inspection items for composite pads are the items specified in Articles 5.1.1 to 5.1.3, and the factory inspection items for composite plates are the items specified in Articles 5.2.1 to 5.2.3.
7.4.2 Composite (board) pads are inspected in batches per shift, and are sampled and inspected according to the one-time sampling plan of GB2828. The general inspection level IL is 6
JB/T6628-1993
I, and the qualified quality level AQL is 10. The appearance quality adopts full inspection. 7.5 Type inspection
When one of the following situations occurs, type inspection should be carried out:
Testing new products:
The product structure, materials, and processes have changed significantly; The continuous production time is more than 6 months;
The suspension time exceeds 3 months:
The factory inspection results are significantly different from the last type inspection; The superior quality supervision agency requires type inspection. The type inspection items of composite pads shall be in accordance with Article 5.1; the type inspection items of composite boards shall be in accordance with Article 5.2. The sampling procedure and judgment rules shall be implemented in accordance with GB2829. A single sampling plan is adopted, with an RQL value of 30 and a discrimination level of II. Packaging, transportation and storage
Marking,
The packaging box of the composite (board) pad should indicate: a.
Product name;
Product trademark:
Manufacturer name;
Gross weight, net weight:
Manufacturing date or production batch number;
"Moisture-proof\" words and marks.
The composite (board) pad is packed in a wooden box lined with waterproof paper, and it should be ensured that it will not be damaged or lost during transportation and storage. The packaging box should be accompanied by a packing list, which should indicate: Product Name:
Product trademark;
Manufacturer name:
Product quantity;
Product specifications;
Manufacture date.
The package box should be accompanied by a product certificate, which should indicate: Product name:
Product trademark:
Product mark;
Batch number:
Standard number:
Manufacture date and validity period:
g.Manufacturer name:
h. Inspector name or code
JB/T 6628-1993
8.3 Transportation and storage 8.3.1
Composite (plate) pads must be protected from rain and moisture during transportation. 8.3.2 Composite (plate) pads should be stored in a clean, ventilated and dry warehouse. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wu Suyun and Wang Qiang. People's Republic of China
Mechanical Industry Standard
Flexible Graphite Composite Reinforced (Plate) Pad
JB/T 66281993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing
Postal Code: 100044)
Format: 880×1230
Printing Sheet: 3/4
Word Count: 16,000
First Edition in October 1993
First Printing in October 1993
Print Quantity: 1-500
Price: 5.00 Yuan
Mechanical Industry Standards Service Network: http://www.JB.ac.cn899
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