OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 33 Explosives Safety

Section 474 Oldest used first

Over time, some types of explosives can deteriorate and become less effective. To limit the likelihood of explosives being kept in storage for extended periods of time and being allowed to deteriorate, an “oldest first” – older explosives should be stacked in front of newer ones – practice must be followed. This ensures constant turnover of explosives that limits how long they are stored before being used.