Recently, we received feedback from a company that when applying for third-party transportation appraisal of aerosol products, they were required to provide hot water tank test results. In this issue, the editor will give a technical interpretation of the performance requirements of aerosol cans that need to be met when aerosol products are submitted for transportation.

Section 6.2.4 of the United Nations TDG regulations stipulates performance requirements for hot water tank testing for filled aerosols, small gas cylinders and fuel cell boxes (containing liquefied flammable gas) that are intended for transportation.

Figure 1 Introduction to hot water tank test

As shown in Figure 1, the purpose of the hot water tank test is to examine whether small pressure vessels containing gases such as aerosols will leak or be permanently deformed as the internal pressure rises when heated, thereby avoiding subsequent transportation. In this link, changes in the temperature of the transportation environment may cause leakage of the tank, resulting in safety accidents.

As shown in Figure 2, the hot water tank test is usually conducted at 55°C. Of course, if the contents are sensitive to heat or the outer packaging becomes soft at high temperatures, the temperature can be lowered, but you still need to choose an aerosol that can be used at high temperatures. experimenting.

2. Performance requirements of empty aerosol cans

The hot water tank test examines whether a fully filled aerosol can sample will leak or be deformed affecting transportation safety at high temperatures. In addition, according to section 6.2.4.2.2.2 of the TDG regulations, empty aerosol cans must also meet the leakage rate of no more than 3.3×10-2 mbar·L·under a certain pressure before use. Seconds -1.

This requirement is consistent with the "deformation pressure and bursting" in the two aerosol can product standards of my country's GB 13042-2008 "Packaging Containers Iron Aerosol Cans" and GB/T 25164-2010 "Packaging Containers 25.4mm Diameter Aluminum Aerosol Cans". Stress Test” has similarities.

Therefore, in summary, when aerosol samples are submitted for transportation, both empty and full tanks must meet certain performance inspection requirements. Aerosol cans that fail to pass the relevant tests cannot be safely transported, so when applying for third-party cargo transportation condition appraisal, they will not be accepted.