（In USG-18, it indicates, for example, UN 1072 need to be placed in a rigid outer packaging that meets specified flame penetration and thermal resistance requirement. What does ?grigid outer packaging?h mean?）
Q.
State Variation USG-18 indicates, for example, UN 1072 need to be placed in a rigid outer packaging that meets specified flame penetration and thermal resistance requirement. What does ?grigid outer packaging?h mean? Is it an Overpack? How must it be Dec ared on the DGD? (31 Jul 11)
A.
A ?grigid outer packaging?h means simply a hard outer package, i.e., it would not have to be a UN specification Mar ed outer packaging. It is more or less a strong Overpack having the required flame penetration and thermal resistance features.
As you know, the cylinder itself is a UN certified outer package. The US rule requires the shipper to protect the UN certified cylinder in a ?grigid outer packaging?h having the flame penetration and thermal resistance features. So it is 100% an Overpack.
The DGD should be made, such as:
1 steel cylinder x 2kg
OVERPACK used x 3
If the ?grigid outer packaging?h carries a UN packaging specification Mar , then the shipment can be Dec ared as a Combination package, and May be Dec ared, such as:
3 wooden boxes x 2kg
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