This standard specifies the general requirements for the marking, packaging, transportation and storage of rubber sealing products (hereinafter referred to as products). This standard applies to rubber sealing products, such as O-rings, V-rings, rotary shaft lip seals, etc. Rubber materials and other rubber products can be used as a reference. GB/T 5721-1993 General provisions for marking, packaging, transportation and storage of rubber sealing products GB/T5721-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
General rules of identification, packaging, transportation and storage for rubber sealing products
General rules of identification, packaging, transportation and storage for rubber sealing products 1. Subject content and scope of application
GB/T5721-93
Replaced by C 572- 8
This standard specifies the general requirements for the identification, packaging, transportation and storage of rubber sealing products (hereinafter referred to as products). This standard applies to rubber sealing products, such as O-rings, V-rings, rotary shaft lip seals, etc. Rubber compounds and other rubber products can be used as a reference.
2 Marking
2.1·Marking content and requirements
2.1.1 The marking content is as follows:
Product name, specification or code;
Product standard code;
Rubber standard code and rubber code;
Vulcanization date;
Product quantity;
Manufacturer inspection batch number and qualified mark;
Manufacturer name or code and trademark.
2.1.2 The marking should be clear, eye-catching, firm and of appropriate size. 2.2 Marking of products
2.2.1 The marking of products should comply with the provisions of Article 2.1 or relevant standards. For export products and special products, the supply and demand parties may formulate separate rules.
2.2.2 Whenever it is appropriate to make identification marks on products, letters and numbers shall be used to mark on the non-working surface of the products. The marking content generally consists of product code, specifications, etc.
2.2.3 When it is not appropriate to mark on the product, the marking should be made on the outside of the packaging bag (box, case) or a card with the marking content of Article 2.1 should be attached to the packaging bag (box, case).
2.3 Marking of packaging
2.3.1 Each inner packaging (including small packaging and intermediate packaging) container and packing container should be marked on the outside. The marking content should comply with the provisions of Article 2.1.
2.3.2 If transparent or translucent materials are used for packaging, instead of marking on the outside of the bag (box, case), a card with the marking content of Article 2.1 can be placed in the bag (box, case) instead.
Approved by the State Administration of Technical Supervision on December 30, 1993, and implemented on October 1, 1994
.3 Packaging
3.1 Packaging preparation
GB/T5721-93
3.1.1 In principle, the same batch and the same specification of the same products should be packed in a packaging container. 3.1.2 The qualified products should be clean and should not be contaminated by dirt, dust, oil or grease. Preservatives should not be applied to the products. Metal chips and other sharp objects should be prevented from damaging the products. No bundling or labeling should be done on any part of the products. 3.2 Classification and requirements of packaging and packing
3.2.1 Small packaging
3.2.1.1 Grade A
a.. Each packaging bag (box, case) contains only one product. b. The preferred internal dimensions of the packaging bag (box, case) are as follows: 55mm×55mm; 100mm×100mm; 150mm×150mm; 205mm×205mm; 330mm×330mm; 400mm×400mm; 550mm×550mm. c. As shown in Figure 1, identical packaging bags with a size of less than 255mm can be connected end to end to form a strip-type package, or a hole can be punched in the middle of the sealing area of ​​the packaging bag to form a sheet-type package. o
Sheet-type package
Band-type package
Note ① indicates the sealing area of ​​the packaging bag
Indicates a hole for easy tearing
Figure 1 Examples of strip-type and sheet-type packages
d Opaque materials that can be heated to seal the bag mouth should be used preferentially, such as vinyl-coated kraft paper, aluminum foil/paper/polyethylene composite materials or opaque polyethylene or polypropylene films. However, polyvinyl chloride film and plastic film containing plasticizers shall not be used. The basic thickness of polyethylene and polypropylene films used alone should be greater than 50μm. The packaging bag should be firmly sealed.
GB/T5721-93
f: If the product to be packaged is an O-ring, when its outer diameter is 330mm or less, it should not be coiled and should be directly loaded into the packaging bag (box, case). When its outer diameter is more than 330mm, it can be coiled as shown in Figure 2 to reduce the outer dimensions and facilitate packaging in a smaller size packaging bag (box, case). Be careful when coiling to avoid knotting and creases on the product itself. The cross section of the product should not be twisted after coiling. If the coiled ring is easy to spread out after being packed into the bag (box, box) due to the geometric shape of the product (cross-sectional diameter and inner diameter), the bag (box, box) should be filled with sufficient filler or fixed with pre-formed cardboard, etc. to prevent the product from spreading out, and then the four corners of the cardboard should be firmly glued with pressure-sensitive tape. However, the pressure-sensitive tape should not contact the product, and the cardboard should not deform when it is compressed. Figure 2 Reference method for coiled O-rings
3.2.1.2B-level
The products should be properly wrapped or isolated with polyethylene or polypropylene film before being packed into the packaging bag (box, box). a.
The quantity limit of each packaging bag (box, box) should meet the requirements of the following table. b.
Table B-level small package quantity limit
Product outer dimensions, mm
c., the preferred internal dimensions of the packaging bag (box, box) shall be as specified in b of 3.2.1.1. d. The packaging bags (boxes, cases) should be firmly sealed, and the packaging materials should comply with the provisions of d in 3.2.1.1. 3.2.2 Intermediate packaging
3.2.2.1 Grade A
Number of products in each packaging bag
(maximum), pieces
If specified or required by the supplier, several small packages should be further packed together in intermediate packaging containers before packing. The mass should not exceed 5kg. Intermediate packaging containers can be cardboard boxes, corrugated cardboard boxes or fiberboard boxes. 3.2.2.2 Grade B
If not otherwise specified, intermediate packaging is not required. 3.2.3 Packing
3.2.3.1 Grade A
Wooden boxes, plywood boxes reinforced with wooden slats, or fiberboard boxes reinforced with wooden slats should be used as packing containers. The packing container should be equipped with box liners, firmly tied and tightly closed, and the gross weight after packing should not exceed 90kg. 3.2.3.2B level
a. Unless otherwise specified, the products shall be shipped in packing containers that comply with the contract. The packing shall comply with the transportation regulations and the regulations corresponding to the mode of transportation. It shall ensure that the products are safely transported to the delivery location. When the number of products sent to the same location is small, it is allowed to pack products of different specifications in the same packing container, but the same batch and the same specification of the same products must be packed together in small b.
packaging or intermediate packaging, and then packed into the packing container and sealed. GB/T5721—93
When the product must be packed together with its assembly equipment, the product shall be kept in the original marked packaging bag (box, case). c.
3.3 For rubber materials, refer to the relevant requirements of this chapter, adopt plastic bags for sealing packaging, and pack according to the requirements of Class A. The net weight of each box shall not exceed 50kg.
4 Transportation
4.1 During transportation, the products should be protected from direct sunlight and rain and snow. It is strictly forbidden to contact with oil, grease, acid, alkali and other substances that may damage the quality of the products.
4.2 Proper operation should be carried out during loading, unloading and transit storage and transportation. If it is necessary to stack container packing, it should be avoided that the container packing at the bottom of the stacking and the products in it are damaged due to stacking too high or too heavy. 5 Storage
Products should usually be packaged according to regulations and then stored in the storage room. 5.1 Storage conditions
5.1.1 Temperature
The storage temperature should be below 30℃, preferably below 15℃, and the products should be at least 1m away from the heat source. Products stored at low temperatures should be handled carefully when loading and unloading at this temperature to avoid twisting them. Before being put into use, they should be fully parked at room temperature to raise their temperature to close to the ambient temperature.
5.1.2 Humidity
Products should not be stored in humid storage rooms. There should be no condensation during storage. The relative humidity of the storage room should not be greater than 80%. 5.1.3 Light
Products should be protected from light, especially direct sunlight and light sources with high ultraviolet rays. Ordinary incandescent lamps are best used for indoor lighting.
5.1.4 Ozone
No device that can generate ozone should be used in the storage room, such as fluorescent lamps, mercury vapor lamps, high-voltage electrical appliances, motors or other devices that can generate electric sparks or silent discharges. Combustible gases or organic vapors that may generate ozone through photochemical reactions should be isolated. 5.1.5 Deformation
Stored products should not be stretched, compressed or deformed in other forms. Products should never be hung by bolts with thin ropes, wires, etc.
5.1.6 Contact contamination
5.1.6.1 Liquid and semi-solid materials
During storage, products are not allowed to come into contact with liquid and semi-solid materials such as acids, alkalis, solvents and greases. 5.1.6.2 Metals
Products should not come into contact with certain metals, especially copper and manganese, during storage. 5.1.6.3. Isolation powder
No isolation powder should contain components that are harmful to vulcanized rubber. The isolation powders that are usually allowed to be used are talcum powder and fine-grained mica powder.
5.1.6.4 Adhesives
Any adhesive or surface treatment agent used should not have a harmful effect on vulcanized rubber. 5.1.6.5 Containers, packaging and covering materials
Any container, packaging and covering materials should not contain substances that are harmful to vulcanized rubber, such as copper cyclohexane acid, creosote, etc. 5.1.6.6 Different rubbers
Rubber products of different types or different formulations should avoid contact with each other. 5.1.6.7 Biological hazardsbzxZ.net
GB/T 5721-93
Care should be taken to prevent certain animals, especially rodents, from harming and contaminating the products. Certain insects or molds should be prevented from growing on the products. 5.2 Cleaning
When the products need to be cleaned, they can be washed with water and neutral detergent. Then dry them at room temperature. However, it is prohibited to use abrasives and solvents such as trifluoroethylene, carbon tetrachloride, hydrocarbons, etc. to clean products. 5.3 Inventory circulation
The residence time of products in the warehouse should be as short as possible. Products should be put in and out of the warehouse in an orderly manner so that the products left in the warehouse are always the most recently manufactured or delivered products.
Additional remarks:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Hao Fusen, Huang Zuchang, and Su Guirong
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