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1、简单来说就是限量包装。

2、IMDG规定如下：3.4.1 General3.4.1.1 This Chapter provides the provisions applicable to the transport of dangerous goods of certain classespacked in limited quantities. The applicable quantity limit for the inner packaging or article is specified foreach substance in Column 7a of the Dangerous Goods List of Chapter 3.2. In addition, the quantity "0" hasbeen indicated in this column for each entry not permitted to be transported in accordance with this Chapter.3.4.2 Packing3.4.2.1 Dangerous goods shall be packed only in inner packagings placed in suitable outer packagings. Intermediatepackagings may be used. In addition, for articles of Division 1.4, Compatibility Group S, the provisions ofsection 4.1.5 shall be fully complied with. The use of inner packagings is not necessary for the transport ofarticles such as aerosols or "receptacles, small, containing gas". The total gross mass of the package shallnot exceed 30 kg.3.4.2.2 Except for articles of Division 1.4, Compatibility Group S, shrink-wrapped or stretch-wrapped trays meetingthe conditions of 4.1.1.1, 4.1.1.2 and 4.1.1.4 to 4.1.1.8 are acceptable as outer packagings for articles or innerpackagings containing dangerous goods transported in accordance with this Chapter. Inner packagingsthat are liable to break or be easily punctured, such as those made of glass, porcelain, stoneware or certainplastics, shall be placed in suitable intermediate packagings meeting the provisions of 4.1.1.1, 4.1.1.2 and4.1.1.4 to 4.1.1.8, and be so designed that they meet the construction requirements of 6.1.4. The total grossmass of the package shall not exceed 20 kg.3.4.2.3 Liquid goods of Class 8, packing group II in glass, porcelain or stoneware inner packagings shall be enclosedin a compatible and rigid intermediate packaging.3.4.3 StowageDangerous goods packed in limited quantity are allocated stowage category A as defined in 7.1.3.2. The otherstowage provisions indicated in column (16) of the Dangerous Goods List are not applicable.。

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