The above marks shall be placed in three groups:
- Manufacturing marks shall be the top grouping and shall appear consecutively in the sequence
given in 6.2.2.7.4 except for the marks described in 6.2.2.7.4 (q) and (r) which shall be adjacent
to the periodic inspection and test marks of 6.2.2.7.7.
- The operational marks in 6.2.2.7.3 shall be the middle grouping and the test pressure (f) shall
be immediately preceded by the working pressure (i) when the latter is required.
- Certification marks shall be the bottom grouping and shall appear in the sequence given
in 6.2.2.7.2.
The following is an example of marking a cylinder.
2 Distinguishing sign of the State of registration used on motor vehicles and trailers in international road traffic,
e.g. in accordance with the Geneva Convention on Road Traffic of 1949 or the Vienna Convention on Road Traffic of
1968.

Other marks are allowed in areas other than the side wall, provided they are made in low stress areas
and are not of a size and depth that will create harmful stress concentrations. In the case of closed
cryogenic receptacles, such marks may be on a separate plate attached to the outer jacket. Such marks
shall not conflict with required marks.

In addition to the preceding marks, each refillable pressure receptacle that meets the periodic
inspection and test requirements of 6.2.2.4 shall be marked indicating:
(a) The character(s) identifying the country authorizing the body performing the periodic
inspection and test as indicated by the distinguishing sign used on vehicles in international
road traffic2. This mark is not required if this body is approved by the competent authority of
the country approving manufacture;
(b) The registered mark of the body authorised by the competent authority for performing
periodic inspection and test;
(c) The date of the periodic inspection and test, the year (two digits) followed by the month (two
digits) separated by a slash (i.e. "/" ). Four digits may be used to indicate the year.
The above marks shall appear consecutively in the sequence given.

For acetylene cylinders, with the agreement of the competent authority, the date of the most recent
periodic inspection and the stamp of the body performing the periodic inspection and test may be
engraved on a ring held on the cylinder by the valve. The ring shall be configured so that it can only
be removed by disconnecting the valve from the cylinder.

(Deleted)

Marking of non-refillable UN pressure receptacles

Non-refillable UN pressure receptacles shall be marked clearly and legibly with certification and gas
or pressure receptacle specific marks. These marks shall be permanently affixed (e.g. stencilled,
stamped, engraved, or etched) on the pressure receptacle. Except when stencilled, the marks shall be
on the shoulder, top end or neck of the pressure receptacle or on a permanently affixed component of
the pressure receptacle (e.g. welded collar). Except for the UN packaging symbol and the "DO NOT
REFILL" mark, the minimum size of the marks shall be 5 mm for pressure receptacles with a diameter
greater than or equal to 140 mm and 2.5 mm for pressure receptacles with a diameter less than 140
mm. The minimum size of the UN packaging symbol shall be 10 mm for pressure receptacles with a
diameter greater than or equal to 140 mm and 5 mm for pressure receptacles with a diameter less than
140 mm. The minimum size of the "DO NOT REFILL" mark shall be 5 mm.

The marks listed in 6.2.2.7.2 to 6.2.2.7.4 shall be applied with the exception of (g), (h) and (m). The
serial number (o) may be replaced by the batch number. In addition, the words "DO NOT REFILL" in
letters of at least 5 mm in height are required.

The requirements of 6.2.2.7.5 shall apply.
NOTE: Non-refillable pressure receptacles may, on account of their size, substitute a label for
these permanent marks.

Other marks are allowed provided they are made in low stress areas other than the side wall and are
not of a size and depth that will create harmful stress concentrations. Such marks shall not conflict
with required marks.
 
2 Distinguishing sign of the State of registration used on motor vehicles and trailers in international road traffic,
e.g. in accordance with the Geneva Convention on Road Traffic of 1949 or the Vienna Convention on Road Traffic of
1968.

Marking of UN metal hydride storage systems

These marks shall be permanently affixed (e.g. stamped, engraved, or etched) on the metal hydride
storage system. The marks shall be on the shoulder, top end or neck of the metal hydride storage
system or on a permanently affixed component of the metal hydride storage system. Except for the
United Nations packaging symbol, the minimum size of the marks shall be 5 mm for metal hydride
storage systems with a smallest overall dimension greater than or equal to 140 mm and 2.5 mm for
metal hydride storage systems with a smallest overall dimension less than 140 mm. The minimum size
of the United Nations packaging symbol shall be 10 mm for metal hydride storage systems with a
smallest overall dimension greater than or equal to 140 mm and 5 mm for metal hydride storage
systems with a smallest overall dimension less than 140 mm.

 
The following marks shall be applied:
(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;
 
(b)      "ISO 16111" (the technical standard used for design, manufacture and testing);
 
(c)    The character(s) identifying the country of approval as indicated by the distinguishing sign 
   used on vehicles in international road traffic2;
NOTE: The country of approval shall be understood to be the country that approved the body which 
inspected the individual receptacle at the time of manufacture.
 
(d) The identity mark or stamp of the inspection body  that  is  registered  with  the  competent 
authority of the country authorizing the marking;
 
(e) The date of the initial inspection, the year (four digits) followed by the month (two digits) 
separated by a slash (i.e. "/");
 
(f)  The test pressure of the receptacle in bar, preceded by the letters "PH"  and followed  by the 
  letters "BAR";
 
(g) The rated charging pressure of the metal hydride storage system in bar, preceded by the letters 
"RCP" and followed by the letters "BAR";
 
(h) The manufacturer's mark registered by the competent authority. When the  country  of  
manufacture is not the same as the country of approval, then the manufacturer's mark shall be 
preceded by the character(s) identifying the country of manufacture as indicated by the 
distinguishing sign used on vehicles in international road traffic2. The country mark and the 
manufacturer’s mark shall be separated by a space or slash;
 
(i)       The serial number assigned by the manufacturer;
 
(j) In the case of steel receptacles and  composite  receptacles  with  steel  liner,  the  letter  
"H" showing compatibility of the steel (see ISO 11114-1:2012); and,
 
(k)   In the case of metal hydride storage systems having limited life, the date of expiry, denoted 
by  the letters "FINAL" followed by the year (four digits) followed by the month (two digits) 
separated by a slash (i.e. "/").
 
 
2                   Distinguishing sign of the State of registration used on motor vehicles and 
trailers in international road traffic,
e.g. in accordance with the Geneva Convention on Road Traffic of 1949 or the Vienna Convention on 
Road Traffic of 1968.
 
The certification marks specified in (a) to (e) above shall appear consecutively in the sequence given.
The test pressure (f) shall be immediately preceded by the rated charging pressure (g). The
manufacturing marks specified in (h) to (k) above shall appear consecutively in the sequence given
 

Other marks are allowed in areas other than the side wall, provided they are made in low stress areas
and are not of a size and depth that will create harmful stress concentrations. Such marks shall not
conflict with required marks.

 
tion  to  the  preceding  marks,  each  metal  hydride  storage  system  that  meets  the  periodic
inspection and test requirements of 6.2.2.4 shall be marked indicating:
 
(a) The character(s) identifying the country authorizing  the  body  performing  the  periodic  
inspection and test, as indicated by the distinguishing sign used on vehicles in international road 
traffic2. This mark is not required if this body is approved by the competent authority of the 
country approving manufacture;
 
(b) The registered mark of the body authorised by the competent authority for performing periodic 
inspection and test;
 
(c) The date of the periodic inspection and test, the year (two digits) followed by the month (two 
digits) separated by a slash (i.e. "/" ). Four digits may be used to indicate the year.
The above marks shall appear consecutively in the sequence given.
 
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