They may have been filled with contaminated refrigerant gas
The Australian Maritime Safety Authority (AMSA) issued a notice cautioning that refrigerated shipping containers re-gassed in Vietnam between March and June 2011 may have been filled with contaminated refrigerant gas.
Container owners/operators and shippers or consignees should check their records to determine whether any of their containers may be impacted.
Service and maintenance work on the refrigeration units on refrigerated shipping containers should only be performed by qualified refrigeration technicians using appropriate precautions.
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Source: AMSA