This standard specifies the moisture-proof level, requirements, packaging methods, test methods and markings for packaging. This standard applies to industrial products such as machinery and electronics, and other products can also refer to it. GB/T 5048-1999 Moisture-proof packaging GB/T5048-1999 Standard download decompression password: www.bzxz.net
This standard specifies the moisture-proof level, requirements, packaging methods, test methods and markings for packaging. This standard applies to industrial products such as machinery and electronics, and other products can also refer to it.

GB/T 5048—1999
Moisture-proof packaging is a protective measure taken to protect industrial products such as machinery and electronics from being damaged by humid atmosphere during circulation. This standard mainly revised the following contents when GB/T5048—1985 (Moisture-proof packaging) was revised: the moisture-proof packaging grade classification I, 1, and I in the original standard was revised to moisture-proof grade 1, grade 2, and grade 3 packaging. Appendix A in the original standard was cancelled.
The selection of desiccant was revised to Appendix A (suggestive appendix. This standard will replace GB/T5048—1985 from the date of implementation. Appendix A of this standard is a suggestive appendix.
This standard is issued by China National Packaging Corporation This standard is proposed. This standard is under the jurisdiction of the National Packaging Standardization Technical Committee. The responsible drafting units of this standard are: Mechanical Science Research Institute, Hangzhou Lin'an Special Adsorbent Factory, Changzhou Sinochem Qinfeng Plastic Co., Ltd. The main drafters of this standard are: Li Xuelong, Jia Xinlong, Zhang Xiaojian, Zhou Junsen, Zhang Fuqiang. This standard was first issued on April 10, 1985. 397
1 Scope
National Standard of the People's Republic of China
Moistureproof Packaging
Moistureproof packaging
This standard specifies the moisture-proof grade, requirements, packaging methods, test methods and markings of packaging. This standard is applicable to industrial products such as machinery and electronics, and other products can also refer to it. 2 Cited standards
GB/T 5048-1999
Replaces GB/T5048—1985
The clauses contained in the following subtitles constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990 Pictorial markings for packaging storage and transportation
GB/T10371988Test method for water vapor permeability of plastic film and sheet Cup method GB/T 69811986
Test method for moisture permeability of rigid packaging containers
GB/T 6982—1986
Test method for moisture permeability of flexible packaging containers
GB/T 10455-1989
Silica gel desiccant for packaging
Protective inner packaging materials
GB/T 12339-1990 [
GB/T15171-1994Test method for sealing performance of flexible packaging GJB 145A--1993E
Protective packaging specification
GJB 2494—1995
GJB 2714—1996
3 Moisture-proof packaging level
Specification for humidity indicator cards
General specification for static moisture-absorbing bagged active desiccant for packaging3.1 When a product requires moisture-proof packaging, the moisture-proof packaging level requirements for the product packaging must be specified in the product technical documents. 3.2 The moisture-proof level of the packaging should be determined based on factors such as the nature of the product, the circulation environment, the storage and transportation time, and the general performance of the packaging container. 3.3 The moisture-proof packaging level is divided into level 1 packaging, level 2 packaging, and level 3 packaging, see Table 1 for details. Table 1 Moisture-proof packaging level
1st level packaging
2nd level packaging
3rd level packaging
Moisture-proof period
1 to 2 years
0.5 to 1 year
Within 0.5 years
Temperature and humidity conditions
Product properties
Temperature greater than 30°C, relative humidity greater than 90%, products that are sensitive to humidity, prone to rust, dew and deterioration, as well as precious and precise products
Temperature at 20 ℃～30C, relative temperature between 70%~90% for products slightly sensitive to humidity, more valuable, more precise products, temperature less than 20℃, relative temperature less than 70% for products not sensitive to humidity, approved by the State Administration of Quality and Technical Supervision on September 7, 1999 398, implemented on February 1, 2000 4 Requirements 4.1 General requirements GB/T 5048-1999 4.1.1 Determine the moisture-proof packaging grade and package according to the grade requirements. 4.1.2 The product must be dry and clean before packaging. 4.1.3 If the product has sharp protrusions and may damage the moisture-proof barrier layer, protective measures should be taken. 4.1.4 When other protection requirements are required for products during moisture-proof packaging, corresponding measures should be taken in accordance with the provisions of other professional packaging standards.
4.1.5 The support and fixation taken to prevent the product from moving during transportation should be placed outside the moisture-proof barrier layer as much as possible. 4.1.6 The volume of moisture-proof packaging should be reduced.
4.1.7 Humidity indicator cards, humidity indicators or humidity indicator devices should be used and should be kept away from desiccants. Humidity indicator cards should comply with the relevant provisions of GJB2494.
4.1.8 Moisture-proof packaging should be operated continuously and the packaging should be completed in one go. If the operation is stopped halfway, temporary moisture-proof protection measures should be taken. 4.2 Humidity requirements in moisture-proof packaging
During the validity period of moisture-proof packaging, the relative humidity of the air in the packaging container shall not exceed 60% (25℃). 4.3 Material requirements
4.3.1 The quality of the materials selected for moisture-proof packaging must comply with the provisions of relevant product standards. 4.3.2 The selection of inner protective packaging materials for moisture-proofing shall comply with the relevant provisions of GB/T12339. 4.3.3 The moisture permeability of moisture-proof packaging materials or packaging containers shall be selected according to the grade of moisture-proof packaging in accordance with Table 2. The water vapor permeability of materials shall comply with the relevant provisions of GB/T1037. The moisture permeability of rigid packaging containers shall comply with the relevant provisions of GB/T6981. The moisture permeability of flexible packaging containers shall comply with the relevant provisions of GB/T6982.
Table 2 Water vapor permeability of moisture-proof packaging materials and moisture permeability of containers Moisture-proof packaging grade
1st grade packaging
2nd grade packaging
3rd grade packaging
Film, g/(m2·24 h)
1) Measured at a temperature of (40±1)℃ and a relative humidity of 80% to 92%. Container\, g/(m2·30d）
4.3.4 Various materials used for packaging should be dry, and the cushioning and lining materials should be non-hygroscopic or low-hygroscopic materials. 4.4 Requirements for desiccant
4.4.1 Desiccantwww.bzxz.net
If there is no special provision, the desiccant is generally silica gel or montmorillonite. The silica gel desiccant should comply with the relevant provisions of GB/T10455. Montmorillonite desiccant should comply with the provisions of GJB2714. 4.4.2 Placement of desiccant
The desiccant is placed in a cloth bag or a paper bag with sufficient strength, and placed in one or more suitable positions of the packaging container. The desiccant bag mouth should be tied with a rope, hung or fixed by other methods. Prevent the bag from moving or breaking to damage the product. When placing the desiccant bag, it must not come into contact with the precision surface of the product; when it comes into contact with parts coated with rust inhibitor, the bag and the product must be separated by non-corrosive and oil-resistant packaging materials; the time from taking out the treated desiccant to placing it in the package and sealing it should be as short as possible. 4.4.3 Selection of desiccant
The selection of desiccant can be carried out according to Appendix A.
4.5 Sealing requirements
4.5.1 The sealing heat seal strength of moisture-proof packaging shall be tested in accordance with the provisions of 6.1 and shall be greater than 30N/5cm. 4.5.2 The sealing performance of moisture-proof packaging of soft packaging shall be tested in accordance with the provisions of 6.2 and shall not have defects such as pinholes, cracks and seal opening. 399
4.6 Environmental requirements
GB/T 5048-1999
The packaging environment should be clean and dry. The temperature should not be higher than 35℃ and the relative condensation degree should not be greater than 75%; condensation is not allowed. 5 Moisture-proof packaging method
5.1 Use metal or non-metal containers with zero or near-zero moisture permeability to package the product and then seal it: a) Packaging without desiccant: vacuum packaging, gas-filled packaging, etc.; b) Packaging with desiccant: desiccant is generally silica gel and montmorillonite, 5.2 Use flexible materials with low water vapor permeability to package the product with desiccant and seal it: a) Single flexible film plus desiccant packaging; b) Composite film plus desiccant packaging;
c) Multi-layer packaging, using different materials with low water vapor permeability for packaging. 6 Test method
6.1 The test of heat seal strength of sealing shall be carried out in accordance with the heat welding test in GJB145A. 6.2 The sealing performance test of moisture-proof packaging of flexible packaging shall be carried out in accordance with the provisions of GB/T15171. 6.3 The moisture-proof packaging performance test shall be carried out in accordance with the provisions of the periodic exposure test in GJB145A. Test B can be selected for level 1 packaging. Test A can be selected for level 2 and level 3 packaging. After the test, the relative humidity of the air in the package complies with 4.2 requirements. 7 Marking
The package should be marked with a moisture-sensitive mark on the outside according to the provisions of GB191. 400
Selection of general desiccant
GB/T 5048—1999
Appendix A
(Suggested Appendix)
Selection of desiccant
Simple calculation of general desiccant The dosage is calculated according to formula (A1): W-
Where: W--
Desiccant dosage g;
(A1)
Desiccant moisture absorption coefficient [K=Kb/K. K. is the moisture absorption rate of fine silica gel at a temperature of 25°C and a relative humidity of 60%, is 30%, K is the moisture absorption rate of other desiccants (such as molecular sieves, alumina, activated clay, etc.) under the same temperature and humidity conditions. When using fine-pored silica gel, K=1]; V—internal volume of the packaging container, dm (measurement value). A2 Selection of silica gel desiccant
A2.1 Calculation of silica gel desiccant selection dosage: The dosage of fine-pored silica gel is calculated according to formula (A2), (A3), (A4), (A5): Use mechanically sealed metal containers
W = 20+V+ 0.5D
Bags made of aluminum-plastic composite materials; W = 100AY + 0.5D
Bags made of plastic film packaging materials such as polyethylene: W = 100AR,Y+ 0.5D
Use sealing tape to seal cans and plastic cans: W-300R2Y+0.5D
Wherein: W——Desiccant dosage+g;
V——Internal volume of packaging container, dm (measurement value): Mass of wet materials contained in the packaging (packaging paper, padding, cushioning materials, etc.) Name: D
A—Total area of ​​packaging materials, m (measurement value); (A2)
(A5)
Y—Predetermined storage time (i.e. the next time to replace the desiccant), a; R—Water vapor permeability of packaging film materials under the conditions of temperature of 40°C and relative humidity of 90%, g/(m2·24h); Water vapor permeability of cans and plastic cans sealed with sealing tape under the conditions of temperature of 40°C and relative humidity of 90%, g/R.
(m2·24 h).
A2.2 The water vapor permeability of the composite material is the combination of the water vapor permeability of each layer. It is usually calculated by taking the sum of the reciprocals of the water vapor permeability (R, RR) of each component material as the reciprocal of its total water vapor permeability (R):
(A6)
A2.3 The storage time in formula (A3), (A4), and (A5) is the storage time when the climatic conditions (temperature and humidity) are relatively bad. If it is necessary to convert the storage time under different climatic conditions, it can be carried out according to the provisions of Appendix B and Appendix C of GJB145A-1993. 401
A3 Selection of montmorillonite desiccant
GB/T5048—1999
The selection and dosage of montmorillonite desiccant shall be calculated according to formula (A7) and (A8): Sealed rigid metal packaging container
U=KV+XD+XD+XD+XD
Packaging container other than sealed rigid metal packaging containerU=CA+X,D+XD+X,D+XD
In the formula: center
The number of units of desiccant dosage, each unit of desiccant can absorb at least 3g (20%r·h) or 6g (40%r·h) of water vapor under the equilibrium temperature condition of 25℃ Air: coefficient, when the internal volume of the packaging container is given in cubic meters, take 42.7; internal volume of the packaging container, m (measured value); coefficient, when the inner surface area of ​​the moisture-proof cover is given in square meters, take 17.2; inner surface area of ​​the packaging box, m (measured value); A
coefficient, when the padding is fibrous material (including wood) and other materials not listed in the following classifications, take 17.64; coefficient, when the padding is bonded fiberboard, take 7.92; coefficient, when the padding is glass fiber, take 4.41X
coefficient, when the padding is foam plastic or rubber, take 1.11; D-
mass of the padding, kg (measured value).
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