The sectional freezer uses the polyurethane note type of hard quality

Polyurethane hard quality foam body close hole structure content greater than 90% , seal up for safekeeping gas in steeping hole have low heat-conduction coefficient extremely, so, steep the hot material definitely prepared hard with the polyurethane, even in very thin cases, can obtain very good adiabatic result too, it is the best variety of adiabatic performance in the construction material at present(such as the attached list)

Form The adiabatic performance of construction material compares material heat conduction coefficient

The adiabatic performance of construction material of the form is compared
Material
Heat conduction coefficient/[kcal¢Ù/(m¡¤h¡¤¡æ)]
Thickness of heat preservation /mm
Material
Heat conduction coefficient/[kcal¢Ù/(m¡¤h¡¤¡æ)]
Thickness of heat preservation /mn
¡¡PU is steeped hard
0.020
25
Light cork
0.050
50
Polystyrene foam
0.035
40
Fibreboard
0.560
65
Mineral and cotton
0.040
45
Concrete one
0.300
380
Inflation diatomaceous earth
0.045
50
Ordinary brick
0.600
860

¢Ù 1kcal=4.18J¡£

K¡ªCoefficient
R-¡ªvalue/in¢Ù
0.14
Hard quality PU foam body
7.14
0.26
Foam the polystyrene particle board
3.85
0.32
Glass fibre
3.13
0.36
Pearlite
2.76
0.38
Cellular glass
2.63
0.48
Adiabatic material of vermiculite
2.08

Picture7-1 Impedance of the adiabatic material and conducting rate
¢Ù1in (Ó¢´ç) = 0.0254m¡£