New Saeplast study highlights the advantages of double-walled large containers

Recent research conducted by the University of Iceland in conjunction with container developer RPC Saeplast highlights the advantages of double-walled large containers compared to single-skin alternatives for food storage applications. 

An ice melt study comparing Sæplast’s 70-liter PUR container – with and without a lid – with 70-liter single-walled PE boxes was carried out by Björn Margeirsson, the research manager at RPC Sæplast and assistant professor at the University of Iceland, and three of his students. For the study, they monitored the ambient temperatures and the melting of the ice and calculated the insulation values for the three different formats.

The results saw the 70-liter PUR container with lid had the best performance, “the insulation value being notably higher than even the double-walled version without a lid,” according to Margeirsson. The lowest insulation value belonged to the single-walled PE container; the 70-L PUR container with the lid provided five times better insulation than its PE counterpart, the researchers claimed.

“The huge difference in insulation capabilities was one of the reasons for the quick transition from single-walled boxes to these insulated containers in Icelandic fishing fleets in the '80s,” Margeirsson explained. “The other main reasons were easier, faster, and better handling onboard and ashore, and these benefits remain critical to the continued success of our ranges today.”

The Sæplast 70-L PUR container features a seamless roto-moulded construction, Sæplast said in a press release. PUR refers to the polyurethane insulation injected into the walls of the container’s tub, which helps to deliver a high insulation factor for effective temperature retention and control, the company noted.


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