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LTTR Calculator

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What is Long Term Thermal Resistance (LTTR)Click here to learn more.

Long-Term Thermal Resistance*
THICKNESS
LTTR-VALUE
RSI
PCS/
PKG
METAL
DECK FLUTE SPANABILITY
IN
MM
IN
MM

1.0
1.1
1.2
1.3
1.4

25.40
27.94
30.48
30.02
35.56
6.0
6.6
7.2
7.8
8.4
1.06
1.16
1.27
1.37
1.48
48
43
40
38
34
2 5/8"
2 5/8"
2 5/8"
2 5/8"
2 5/8"
66.68
66.68
66.68
66.68
66.68
1.5
1.6
1.7
1.8
1.9
38.10
40.64
43.18
45.72
48.26
9.0
9.6
10.3
10.9
11.5
1.58
1.69
1.81
1.92
2.02
32
30
28
26
25
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"
111.13
111.13
111.13
111.13
111.13
2.0
2.1
2.2
2.3
2.4
50.80
53.34
55.88
58.42
60.96
12.1
12.8
13.4
14.0
14.7
2.13
2.25
2.36
2.46
2.59
24
22
21
20
20
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"
111.13
111.13
111.13
111.13
111.13
2.5
2.6
2.7
2.8
2.9
63.50
66.04
68.58
71.12
73.66
15.3
15.9
16.6
17.2
17.9

2.69
2.80
2.92
3.03
3.15

19
18
17
17
16

4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"
111.13
111.13
111.13
111.13
111.13

3.0
3.1
3.2
3.3
3.4

76.20
78.74
81.28
83.82
86.36
18.5
19.1
19.8
20.4
21.1
3.26
3.36
3.48
3.59
3.71
16
15
15
14
14
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

111.13
111.13
111.13
111.13
111.13

3.5
3.6
3.7
3.8
3.9
4.0
88.90
91.44
93.98
96.52
99.06
101.60
21.7
22.4
23.0
23.7
24.3
25.0
3.82
3.94
4.05
4.17
4.28
4.40
13
13
12
12
12
12
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"
111.13
111.13
111.13
111.13
111.13
111.13

*Long-term thermal resistance values were determined in accordance with CAN/ULC-S770. All test samples were third-party selected and tested by an accredited material testing laboratory.