Moment of Inertia             I [cm4/m ]

1.01

3.13

10.78

19.85

31.67

Section Modulus              W  [cm3/m ]

2.63

4.63

14.00

19.00

24.00

Rigidity                     E-I  [cm2/m ]

7’100

21’900

75’500

139’000

221’700

Alloy/Temper of Cover sheet 

           A3003 H18 / A3003 H16 / A5052 H34 

Tensile Strength of cover sheet   [N/mm2]

Rm≥125

Rm≥220

Proof Stress                  [N/mm2]

Rp0.2≥80

Rp0.2≥130

Elongation                   [%]

A50≥5%

A50≥10%

Modulus of Elasticity          [N/mm2]

7,000kg/ mm2

Linear Thermal Expansion

2.4mm/m at 100℃ temperature difference

Temperature Resistant

Approximately - 40℃ to +80℃

Sound Absorption Factorα s

0.05

0.05

Airbone Sound Insulation Index  Rw[d/B]

21

21

22

23

25

Thermal Conductivity          λ[w/ m2k]

0.95

1.35

1.78

2.25

2.70

Thermal Resistance            R(I/^) [m2k/w]

0.0063

0.0074

0.0084

0.0089

0.0093

Heat Transition Coefficient      U(k) [w/m2k]

5.67

5.64

5.605

5.59

5.575