GB/T 7350-1999 waterproof packaging, instead of GB/T 7350-1987;
This standard stipulates the waterproof grade, requirement, packing method, test method and sign of packing;
This standard applies to mechanical, electronic and other industrial products, other products can also refer to use.
The waterproof grade of packaging should be determined according to the nature of the product, the circulation environment and the possible water damage
Waterproof packaging grade is divided into class A, grade 1 packaging, 2 grade packaging, 3 grade packaging and B class 1 packaging, 2 grade packaging, 3 grade packaging, see table 1.

Selection and application of waterproof packing materials:
A) waterproof packaging materials should have good water resistance. Commonly used waterproof packaging materials are: Polyethylene low foaming waterproof barrier film, composite film, plastic film, oil paper and so on. Auxiliary materials are: waterproof adhesive tape, waterproof binder, etc..
B) waterproof packaging materials, the quality should be in line with the relevant product standards and the relevant national regulations.
C) waterproof packaging materials, should have a certain strength to withstand the various mechanical factors in the circulation process of harm.
D) for the most external waterproof packaging materials, in addition to requiring a certain strength and water resistance, but also should have anti-aging, pollution prevention, pest control, epidemic prevention and other properties.
E) cover large and medium-sized wooden box use waterproof packaging materials should be of sufficient length and width, Dalian chain of not less than 100 mm.
F) when the waterproof material needs splicing, the lap joint mode should be convenient for rain water outflow, and the lap width should be no less than 60m M.