Examples of marking

The maximum permitted stacking load applicable when the large packaging is in use shall be
displayed on a symbol as shown in Figure or Figure The symbol shall be durable
and clearly visible.
The minimum dimensions shall be 100 mm x 100 mm. The letters and numbers indicating the mass
shall be at least 12 mm high. The area within the printer’s marks indicated by the dimensional arrows
shall be square. Where dimensions are not specified, all features shall be in approximate proportion to
those shown. The mass marked above the symbol shall not exceed the load imposed during the design
type test (see divided by 1.8.


Specific requirements for large packagings

Specific requirements for metal large packagings

50A steel
50B aluminium
50N metal (other than steel or aluminium)

The large packaging shall be made of suitable ductile metal in which the weldability has been fully
demonstrated. Welds shall be skilfully made and afford complete safety. Low-temperature
performance shall be taken into account when appropriate.

Care shall be taken to avoid damage by galvanic action due to the juxtaposition of dissimilar metals.

Specific requirements for flexible material large packagings

51H flexible plastics
51M flexible paper

The large packaging shall be manufactured from suitable materials. The strength of the material and
the construction of the flexible large packagings shall be appropriate to its capacity and its intended

All materials used in the construction of flexible large packagings of types 51M shall, after complete
immersion in water for not less than 24 hours, retain at least 85% of the tensile strength as measured
originally on the material conditioned to equilibrium at 67% relative humidity or less.

Seams shall be formed by stitching, heat sealing, glueing or any equivalent method. All stitched
seam-ends shall be secured.

Flexible large packagings shall provide adequate resistance to ageing and to degradation caused by
ultraviolet radiation or the climatic conditions, or by the substance contained, thereby rendering them
appropriate to their intended use.

For plastics flexible large packagings where protection against ultraviolet radiation is required, it shall
be provided by the addition of carbon black or other suitable pigments or inhibitors. These additives
shall be compatible with the contents and remain effective throughout the life of the large packaging.
Where use is made of carbon black, pigments or inhibitors other than those used in the manufacture of
the tested design type, re-testing may be waived if changes in the carbon black content, the pigment
content or the inhibitor content do not adversely affect the physical properties of the material of

Additives may be incorporated into the material of the large packaging to improve the resistance to
ageing or to serve other purposes, provided that these do not adversely affect the physical or chemical
properties of the material.

When filled, the ratio of height to width shall be not more than 2:1.

Specific requirements for plastics large packagings

50H rigid plastics

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