Boxes of natural wood

4C1 ordinary
4C2 with sift-proof walls

The wood used shall be well seasoned, commercially dry and free from defects that would materially
lessen the strength of any part of the box. The strength of the material used and the method of
construction shall be appropriate to the capacity and intended use of the box. The tops and bottoms
may be made of water resistant reconstituted wood such as hardboard, particle board or other suitable
type.

Fastenings shall be resistant to vibration experienced under normal conditions of carriage. End grain
nailing shall be avoided whenever practicable. Joins which are likely to be highly stressed shall be
made using clenched or annular ring nails or equivalent fastenings.

Box 4C2: each part shall consist of one piece or be equivalent thereto. Parts are considered equivalent
to one piece when one of the following methods of glued assembly is used: Lindermann joint, tongue
and groove joint, ship lap or rabbet joint or butt joint with at least two corrugated metal fasteners at
each joint.

Maximum net mass: 400 kg.

Plywood boxes

4D

Plywood used shall be at least 3-ply. It shall be made from well seasoned rotary cut, sliced or sawn
veneer, commercially dry and free from defects that would materially lessen the strength of the box.
The strength of the material used and the method of construction shall be appropriate to the capacity
and intended use of the box. All adjacent plies shall be glued with water resistant adhesive. Other
suitable materials may be used together with plywood in the construction of boxes. Boxes shall be
firmly nailed or secured to corner posts or ends or be assembled by equally suitable devices.

Maximum net mass: 400 kg.

Reconstituted wood boxes

4F

The walls of boxes shall be made of water resistant reconstituted wood such as hardboard, particle
board or other suitable type. The strength of the material used and the method of construction shall be
appropriate to the capacity of the boxes and to their intended use.

Other parts of the boxes may be made of other suitable material.

Boxes shall be securely assembled by means of suitable devices.

Maximum net mass: 400 kg.

Fibreboard boxes

4G

Strong and good quality solid or double-faced corrugated fibreboard (single or multiwall) shall be
used, appropriate to the capacity of the box and to its intended use. The water resistance of the outer
surface shall be such that the increase in mass, as determined in a test carried out over a period of 30
minutes by the Cobb method of determining water absorption, is not greater than 155 g/m2 - see ISO
535:l991. It shall have proper bending qualities. Fibreboard shall be cut, creased without scoring, and
slotted so as to permit assembly without cracking, surface breaks or undue bending. The fluting of
corrugated fibreboard shall be firmly glued to the facings.

 

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