The letters "T" or "W" may follow the Large Packaging code. The letter "T" signifies a large salvage
packaging conforming to the requirements of 18.104.22.168.9. The letter "W" signifies that the large
packaging, although of the same type indicated by the code, is manufactured to a specification
different from those in 6.6.4 and is considered equivalent in accordance with the requirements
Each large packaging manufactured and intended for use in accordance with the provisions of ADR
shall bear marks which are durable, legible and placed in a location so as to be readily visible.
Letters, numerals and symbols shall be at least 12 mm high and shall show:
(a) The United Nations packaging symbol ;
This symbol shall not be used for any purpose other than certifying that a packaging, a flexible
bulk container, a portable tank or a MEGC complies with the relevant requirements in Chapter
6.1, 6.2, 6.3, 6.5, 6.6, 6.7 or 6.11. For metal large packagings on which the marks are stamped or
embossed, the capital letters "UN" may be applied instead of the symbol;
(b) The number "50" designating a large rigid packaging or "51" for flexible large packagings,
followed by the material type in accordance with 22.214.171.124.1 (b);
(c) A capital letter designating the packing group(s) for which the design type has been
X for packing groups I, II and III Y for packing groups II and III Z for packing group III only;
(d) The month and year (last two digits) of manufacture;
(e) The State authorizing the allocation of the mark; indicated by the distinguishing sign used on
vehicles in international road traffic1;
(f) The name or symbol of the manufacturer and other identification of the large packagings as
specified by the competent authority;
(g) The stacking test load in kg. For large packagings not designed for stacking the figure "0"
shall be shown;
(h) The maximum permissible gross mass in kilograms.
The primary mark required above shall be applied in the sequence of the sub-paragraphs.
Each mark applied in accordance with (a) to (h) shall be clearly separated, e.g. by a slash or
space, so as to be easily identifiable.
1 Distinguishing sign of the State of registration used on motor vehicles and
trailers in international road traffic, in accordance with the Geneva Convention on Road Traffic of
1949 or the Vienna Convention on Road Traffic of
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 126.96.36.199.1 or Figure 188.8.131.52.2. 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 184.108.40.206.3.4) divided by 1.8.
Specific requirements for large packagings
Specific requirements for metal large packagings
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