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There are a metal dewar, glass dewar and FRP dewar, and a metal dewars are usually utilized.
A glass dewar is often utilized in small-scale experiment because it's inside is visible,
however, it requires careful handling because of fragile.
Heat leak of FRP dewar is very small, but it needs to excange for N2 gas in he vessel when returend to room temperature.
Cautions
Please handle with care of the liquid helium dewar because it does not have a strong underlying structure.
Glass He dewar, Alminum He dewar(100L), Stainless He dewar(100L)
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