This standard specifies the types, technical conditions, test methods and inspection rules of flexible graphite braided packing. This standard is applicable to braided packings of flexible graphite and metal materials, flexible graphite and non-metallic materials, and flexible graphite and metal materials and non-metallic materials. JB/T 7370-1994 Flexible graphite braided packing JB/T7370-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7370-94
Flexible Graphite Braided Packing
Published on July 26, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Flexible Graphite Braided Packing
Subject Content and Scope of Application
JB/T7370-94
This standard specifies the model, technical conditions, test methods and inspection rules of flexible graphite braided packing. This standard applies to braided packings that are composited with flexible graphite and metal materials, composited with flexible graphite and non-metallic materials, and composited with flexible graphite and metal materials and non-metallic materials.
2 Reference standards
GB1430
GB2828
JB/T6371
JB/T6620
ZBJ22014
3 Model
Determination of sulfur content in carbon rope materials
Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches)Test method for carbonized fiber braided packing
+Test method
Flexible graphite braided packing
Determination method for fixed carbon content in flexible stone-plastic sheet3.1 The model of flexible graphite braided packing consists of uppercase Chinese phonetic letters and Arabic numerals, and the expression method is as follows: RBT
Maximum adaptable temperature
Product structure type and type of reinforcing material (see Table 1) Basic code of flexible graphite braided packing
Structural form
Reinforced material inside the flexible graphite
3.2 Model example
Main types of reinforcing materials
Non-metallic materials
Non-metallic materials and metallic materials
Structural form
Reinforced material outside the flexible graphite
Main types of reinforcing materials
Non-metallic materials
Metallic materials
Reinforced material is non-metallic and wrapped by flexible graphite, and the maximum temperature adaptability is 450C. The model is: RBTN1-450
4 Materials
4.1 The chlorine content of flexible graphite used for flexible graphite braided packing should not exceed 50ppm. 4.2 The performance of other materials used for flexible graphite braided packing should comply with the provisions of relevant standards. 5 Technical requirements
5.1 The appearance of the flexible graphite braided packing should be uniform and smooth, without obvious exposed threads. Approved by the Ministry of Machinery Industry on July 26, 1994
Implementation on July 1, 1995
JB/T7370-94
5.2 The limit deviation of the size specifications of the flexible graphite braided packing should comply with the provisions of Table 2. Table 2
Specifications (packing is too long)
Limit deviation
The technical performance indicators of the flexible graphite braided packing should comply with the provisions of Table 3. Table 3
Volume density
Compression
National ammunition
Carbon content
System content
Heat loss
Storage coefficient
RBTN1-450
Specification <20, ≥0.9
Specification >20, ≥0.7
RBTN2-600
0. 8~1. 2
RBTW1-300
Specification ≤20, ≥0.7
Specification >20, ≥0.9
≤1500
RBTW2 - 45cRBTW2 600
1. 1~1. 4
Note: ①The temperature loss and humidity of different types of products are their respective highest adaptability. ②When measuring carbon content and sparse content, if the product reinforcement material contains metal materials, the metal materials should be stripped off and supported before testing when preparing samples. 6 Test method
6.1 The specification, density, compression rate, rebound rate and 450C temperature loss of flexible graphite braided packing shall be determined in accordance with JB/T6620, the determination of barrier coefficient shall be carried out in accordance with the provisions of JB/T6371, the determination of carbon content shall be carried out in accordance with the provisions of ZBJ22014, and the determination of sulfur content shall be carried out in accordance with the provisions of GB1430.
6.2 The test of temperature loss of flexible graphite braided packing at 300℃ and 600℃ shall be carried out in accordance with Appendix A (supplement). 7 Inspection rules
Flexible graphite braided packing shall be inspected and qualified by the quality inspection department before it can leave the factory. 7.1
7.2 Product inspection is divided into factory inspection and type inspection. The factory inspection items are 5.1, 5.2 and density: type inspection items are 5.1~5.3.
7.3 Type inspection should be carried out in any of the following situations: a.
Product structure, materials, process, etc. have changed significantly; continuous production time is one year;
Suspended production for more than six months and then restarted. 7.45.1 adopts full inspection, and the rest items are random inspection. 7.5 Products of the same brand and specification are counted as a batch of 200kg. If less than 200kg, it is counted as a batch. When sampling, samples of sufficient test quantity are taken from the batch as samples.
7.65.2 and 5.3 are inspected according to the sub-sampling plan specified in GB2828. The general inspection level is 1 and the qualified quality level AQL is 10.
8 Marking, packaging, transportation and storage
The label of each product should have the following signs: product name and model;
Product specifications:
Net weight.
JB/T 737094
Each box of products should have the following signs on the packaging box: moisture-proof and pressure-resistant signs;
Manufacturer name;
Product name and model;
Product specifications:
Net weight, gross weight:
Manufacture date.
8.2 Packaging
Flexible graphite braided packing should be spirally wound on a paper roll or a molded barrel. The diameter of the paper roll or plastic roll should be greater than 5 times the product specification. 8.2.1
Each roll should be wrapped in a plastic bag, and then wrapped with sponge or other shockproof materials and packed in a box that will not damage the product. Generally, the weight of each box does not exceed 30kg. 8.2.2
The packing box shall be accompanied by a packing list, which shall indicate: product name and trademark;
product model and specifications;
manufacturer name;
product quantity:
manufacturing date.
The packing box shall be accompanied by a product certificate, which shall indicate: batch number;
standard number:
inspector name or code.
8.3 Transportation and storage
8.3.1 Flexible graphite braided packing shall be transported by tools that can avoid rain and sun, and shall not be squeezed. It must be loaded and unloaded gently. 8.3.2
Flexible graphite braided packing shall be stored in a dry room. It is strictly forbidden to bake or rain, and prevent it from being exposed to the sun and moisture. The storage period is three years. A1 Test specimen and its preparation
JB/T 7370-94
Appendix A
Flexible graphite braided packing
300℃ and 600℃ loss resistance test method (supplement)www.bzxz.net
A1.1 Take a random section of the sample and decompose it into component lines. Cut it into 2~6mm lengths with a stainless steel knife. Use the reduction method to take 4~6g for testing. A1.2 Three samples are required for each group.
A2 Test steps
A2.1 Take 1±0.1g of the prepared sample with a weighing bottle, dry it in a constant temperature drying oven at 105110℃ for 1h, then transfer it to a dryer and cool it for 30min
A2.2 Place the sample in the weighing bottle into a porcelain ark that has been burned at 800℃ to a constant weight, tap the porcelain ark to make the sample flat, weigh it immediately (accurate to 0.0002g), then put it into a muffle furnace at 300±10℃ or 600±10℃, close the furnace door and burn it for 1h. A2.3 Take out the porcelain ark, cool it for 1~2min, transfer it to a dry medium device and cool it for 30min before weighing it (accurate to 0.0002g). A3 Calculation of test results
The test results are calculated according to formula (A1):
Wherein: w
-heat loss, %:
sample mass before ignition + g:
G,-sample mass after ignition, g.
A3.2 The arithmetic mean of the test values ​​of the 100 samples is the test result, and three significant figures are taken. A4 Deviation
A4.1 The difference between the maximum and minimum values ​​of a group of test values ​​for heat loss at 300℃ shall not exceed 1.5%: The difference between the maximum and minimum values ​​of a group of test values ​​for 600℃ heat loss shall not exceed 3%. Additional Notes
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Jianjiang Cixi Sealing Material General Factory and the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard were Xu Jianrui, Sun Huachao and Liu Guangyi.
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