. 2019 Mar 4;9:3417. doi: 10.1038/s41598-019-39957-x

Table 2.

Some physical properties of the wall materials of conventional cryovials (polypropylene), Aseptic Technologies cryovials (COC), CellSeal vials (COC) West Pharma (COC), cryobags (EVA) and aluminium cassettes.

Wall material	Thermal conductivity, (approx.)	Wall Thickness	Relative conductivity⁽¹⁾
Polypropylene	0.15 W m⁻¹ K⁻¹	1.0 mm	1
Cyclic olefin copolymer (COC)	0.13 W m⁻¹ K⁻¹	1.0 mm	0.9
Ethylene-vinyl acetate (EVA)	0.25 W m⁻¹ K⁻¹	0.3 mm (without overwrap)	5.6
Ethylene-vinyl acetate (EVA)	0.25 W m⁻¹ K⁻¹	0.6 mm (with overwrap)	2.8
Aluminium	200 W m⁻¹ K⁻¹	variable	Typically >100

The relative conduction rates relative to a polypropylene cryovial have been calculated during thawing, i.e. a value of 2 indicates that heat will conduct twice as fast through the wall, and 0.5 half as fast.