The inner receptacle is not intended to perform a containment function without its outer casing. A
"rigid" inner receptacle is a receptacle which retains its general shape when empty without closures in
place and without benefit of the outer casing. Any inner receptacle that is not "rigid" is considered to
be "flexible".

 

The outer casing normally consists of rigid material formed so as to protect the inner receptacle from
physical damage during handling and carriage but is not intended to perform the containment
function. It includes the base pallet where appropriate.

A composite IBC with a fully enclosing outer casing shall be so designed that the integrity of the inner
receptacle may be readily assessed following the leakproofness and hydraulic pressure tests.

IBCs of type 31HZ2 shall be limited to a capacity of not more than 1 250 litres.

The inner receptacle shall be manufactured from suitable plastics material of known specifications and
be of adequate strength in relation to its capacity and its intended use. The material shall be
adequately resistant to ageing and to degradation caused by the substance contained or, where
relevant, by ultraviolet radiation. Low temperature performance shall be taken into account when
appropriate. Any permeation of the substance contained shall not constitute a danger under normal
conditions of carriage.

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 inner receptacle. Where use is made of carbon
black, pigments or inhibitors, other than those used in the manufacture of the tested design type,
retesting may be waived if changes in carbon black content, the pigment content or the inhibitor
content do not adversely affect the physical properties of the material of construction.

Additives may be incorporated in the material of the inner receptacle 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.

No used material other than production residues or regrind from the same manufacturing process may
be used in the manufacture of inner receptacles.

The inner receptacle of IBCs type 31HZ2 shall consist of at least three plies of film.

The strength of the material and the construction of the outer casing shall be appropriate to the
capacity of the composite IBC and its intended use.

The outer casing shall be free of any projection that might damage the inner receptacle.

Metal outer casings shall be constructed of a suitable metal of adequate thickness.

Outer casings of natural wood shall be of well seasoned wood, commercially dry and free from
defects that would materially lessen the strength of any part of the casing. The tops and bottoms may
be made of water resistant reconstituted wood such as hardboard, particle board or other suitable type.

Outer casings of plywood shall be made of well seasoned rotary cut, sliced or sawn veneer,
commercially dry and free from defects that would materially lessen the strength of the casing. All
adjacent plies shall be glued with water resistant adhesive. Other suitable materials may be used with
plywood for the construction of casings. Casings shall be firmly nailed or secured to corner posts or
ends or be assembled by equally suitable devices.

The walls of outer casings of reconstituted wood shall be made of water resistant reconstituted wood
such as hardboard, particle board or other suitable type. Other parts of the casings may be made of
other suitable material.
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