JB/T 8558-1997 This standard, together with JB/T 6626-93 "Polytetrafluoroethylene braided packing", JB/T 6627-93 "Carbon (chemical) fiber impregnated polytetrafluoroethylene braided packing", JB/T 7370-94 "Flexible graphite braided packing" and other standards, constitute a series of standards for braided sealing packing products. This standard specifies the technical requirements, test methods and inspection rules for asbestos and polytetrafluoroethylene mixed packing. This standard is applicable to sealing packings that are mixed with asbestos wire and polytetrafluoroethylene wire, or raw tape and impregnated with polytetrafluoroethylene emulsion and lubricant. JB/T 8558-1997 Asbestos/polytetrafluoroethylene mixed packing JB/T8558-1997 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T85581997
Asbestos/polytetrafluoroethylene mixed packing
1997-04-15 Issued
Ministry of Machinery Industry of the People's Republic of China
Implementation on January 1, 1998
J13/18558-1997
This standard is formulated in accordance with the requirements of the machinery industry technology development plan of the Ministry of Machinery Industry. So far, no international standard for this product has been issued. Therefore, the standard should be formulated according to the current domestic production situation. This standard and JB/TG6626-931 Polyethylene Braided Packing, JB/TG627-931 Polyethylene Braided Packing (Chemical Fiber Braided Packing), JB/T737G-94 Multifunctional Graphite Braided Block Packing and other standards jointly form a series of standards for woven sealing and consumable filling products. This standard should have a one-year transition period after approval and issuance. This standard will be issued by the Ministry of Machinery Industry's Standardization Committee. The starting unit of this standard is the Hefei Machinery Research Institute of the Ministry of Machinery Industry. The drafting units of this standard are: Beijing Yayao Fiber Composite Products Factory, Anhui Langxi Yayao Plastic Products Co., Ltd., and the main drafters of this standard are: Yang Shuyi, Xing Scope
Machinery Industry Standard of the People's Republic of China
Asbestos/PTFE Mixed Packing
JE/T8558..1997
This standard specifies the technical requirements, test methods and inspection results of mixed packing with polytetrafluoroethylene. This standard is used for non-cotton thread and pure polytetrafluoroethylene, or dust-free materials with condensation and leakage of polytetrafluoroethylene emulsion and activator. 1 Reference Standards
The following standards contain provisions that are quoted in this standard and become the text of this standard. When the six standards are quoted, they are valid. All standards will be revised, and the parties involved in the production of this standard will discuss and make the latest version of the standard. JH/T637192
JC 22:.. a5
3 Product classification model
Chemical fiber braiding system test method
Unfinished>Thread
Physical and chemical performance test method
Stone/tetrafluoroethylene end materials are divided into two categories, and their numbers are composed of single letters and Arabic numerals, and the display method is as follows
Model example
Material cutting and matching
Shenzhen ethylene pure
Asbestos thread
Material or surface specifications
Polytetrafluoroethylene belt
Stone brush thread
White/Sichuan jade yarn mixed braiding specifications! 310. Model No.: 553-1
4 Technical requirements
4.1 The performance standard of braided asbestos thread shall comply with JC 221. 4.2 The cross-sectional specifications of asbestos/polytetrafluoroethylene mixed materials shall be in accordance with the specifications in Table 1. Approved by the Ministry of Machinery Industry on April 15, 1997, and implemented on January 1, 1998. JH/T8558-1997. Length: 5-15. 4.3 The appearance quality of asbestos/polytetrafluoroethylene mixed materials shall be good, the weaving pattern shall be smooth, and the surface shall not be impure. When the polytetrafluoroethylene emulsion or other lubricants are applied, the materials shall be distributed with the materials and shall not fall off. There shall be no leakage of thread ends, skipping, missing and edge defects. The elasticity and mechanical properties of asbestos/polytetrafluoroethylene mixed materials shall meet the requirements in Table 2. 4. 4
I 2 Physical and chemical mechanical properties
Body tax customer
Wet loss (2501
Sequence number
Compression rate
Rebound rate
Loss [6-8 Research
5 Test method
Specification, 2--16
Specification, 18--25
Current version: 5~·16
Specification: 18~·25
15--45
5.1 Do not shoot/case four series B packing rate specifications and allowable difference, use the vernier ruler with a precision of 0.02mm to measure from the distance between two vertical villages. Take any point of the packing as the starting point. Mother case 1m measurement Measure once, and take the arithmetic mean of three places as the final result. 5.2 The physical strength, compression rate, elasticity, friction coefficient, wear resistance and aluminum loss test of asbestos/polyethylene materials shall be in accordance with the provisions of B/F6372 and the acid loss test of JC351. 5.3 The appearance of asbestos/polyethylene materials shall be visually inspected with the finished products. 6 Inspection rules
6. Asbestos/polyethylene composite materials shall be inspected after passing the inspection of the "fast department" before they can be released. 6.2 Product inspection is divided into inspection and inspection according to the method. 6.2.1 Factory inspection wwW.bzxz.Net
, the inspection items include: specification size difference, volume density, channel loss, external dead material pad, 6.2. 2 Type inspection
Type inspection items are all items specified in 4.1.~3. When the following situations occur, they should be inspected or tested: a) Test new products:
b) Product assembly:
Formal production has a relatively large change in the tree, material, and soil, which may affect the product performance: normal production is full!
) Capture production within three months of ten-year production
) Submit to the temporary equipment organization for type inspection according to the requirements. 6.3 Provisions for factory inspection
JB/T8558—1997 ||t 6.3.2 The products of non-taxable polyurethane/ethylene blend shall be batched with 500kg. If less than 500kg, it shall be batched. Take out a sample of more than 3m from the defective product as the sample of the batch product. 6.4 During the factory inspection and type inspection, if one of the indicators does not meet the requirements of this standard, double sampling shall be carried out. If it still does not meet the requirements of this standard, the batch of products shall be deemed as unqualified. 7.1 Marking The packaging box of polyurethane/ethylene blend shall be marked with: 1) manufacturer's name and trademark: 2) product name: 3) product type: 4) net weight: 5) manufacturing date or production batch number.
7.2 The asbestos/deep four-year ethylene mixed material is packed into the plastic box and tied firmly. The net weight of the box filling should not exceed kg. The outer packaging of the 7.2.2 right cotton/polytetrafluoroethylene mixed material should be guaranteed not to be damaged during storage and return. 7.2.3 There should be a packing list in the box, which should indicate: a) product name; b) product trademark; e) manufacturer name; product model specification; e) product quantity: production and expiration date.
7.2.4 There should be a product certificate in the box, which should indicate: a) batch number: h) standard number: ) inspector number.
了.3 学箱和监存
了.3! The ethylene ion materials must be protected from rain or moisture during transportation. 7.32 The products should be stored in a clean, dry warehouse, strictly away from drying, exposure to moisture and rain. The storage period shall not exceed 2 years from the date of production.
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