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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

WHAT FUTURE FOR SUPER-INSULATOR?

Get access (open in a dialog) DOI: 10.1615/IHTC9.320
pages 451-456

摘要

Before the end of 1985 all laminated, polyurethane foams used on the French market were credited with an official long-term thermal conductivity k value of 0,029 W.m−1.K−1 .These P.U.R. panels being not protected with air tight barriers.
Afterwards the majority of insulating materials were improved with a long term k value of 0,025 W.m−1.K−1 except one which had a lower value of 0,020 W.m−1.K−1.
This new type of P.U.R. foam has become, and still is in 1989, the best insulating cellular plastic. It was even more efficient than dry air, thereof they're named Superinsulating materials
This P.U.R. foam is the most efficient on the market. Why and how did these P.U.R. foams become so efficient and how will it be possible to keep them as the most efficient ones, even after replacing the R11 as blowing agent with CFCs substitute compounds which are less insulating?