๐”– Bobbio Scriptorium
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Checking insulants for use with cryogenic liquids

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
334 KB
Volume
13
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

One of the tasks undertaken by Shell Research Limited at its Thornton Research Centre, Ellesmere Port in Cheshire, is to obtain a thorough knowledge of the physical and insulation properties of polyurethane foams used at cryogenic temperatures.

Collecting the necessary physical data for this purpose poses the problem of subjecting a foam sample to simulated performance tests at cryogenic temperatures.

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Table 1 Pumping speeds of the cryopump for H 2 and Ar with the cold trap at 4.2 K and 2.2 K respectively (Pumping speeds of N 2 and dry air are equal to those of Ar within 10%) Pumping speed, I s "1 Gas 4,2 K 2.2 K H 2 4 000 5 200 Ar 1 000 1 000 gas molecules even for low values of the sticking pro