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Page 22
2008-10-01
Table 5. Inside Relative Humidities At Which Moisture Will Condense On Windows (cont)
Table 6. Regain of Hygroscopic Materials
Outside
Temperature
Inside Temperature (°F/°C)
Outside
Temperature
Inside Temperature (°F/°C)
°F °C
60/
15.5
65/
18.3
70/
21
75/
23.8
80/
26.6
°F °C
60/
15.5
65/
18.3
70/
21
75/
23.8
80/
26.6
Double Windows, Still Air Double Windows, Wind
-50 -45 34 34 34 33 32 -50 -45 23 26 26 26 25
-40 -40 38 38 36 36 35 -40 -40 32 30 30 29 28
-30 -34 42 42 41 40 38 -30 -34 36 34 34 32 31
-20 -29 47 46 46 44 42 -20 -29 41 39 38 35 35
-10 -23 52 50 49 48 46 -10 -23 46 45 42 42 39
0 -18 57 55 55 52 50 0 -18 52 49 47 46 44
10 -12 62 60 59 57 54 10 -12 58 56 53 52 49
20 -7 69 66 63 62 59 20 -7 65 63 59 58 54
30 -1 76 73 71 68 65 30 -1 72 70 66 64 60
40 4 84 80 79 74 71 40 4 80 78 73 70 67
NOTE: Bold areas indicate that moisture will be in the form of frost on windows.
Industry Materials
Relative Humidity - %
10 20 30 40 50 60 70 80 90
Baking Crackers
Flour
White Bread
2.1
2.6
0.5
2.8
4.1
1.7
3.3
5.3
3.1
3.9
6.5
4.5
5.0
8.0
6.2
6.5
9.9
8.5
8.3
12.4
11.1
10.9
15.4
14.5
14.9
19.1
19.0
Leather Sole Oak, Tanned 5.0 8.5 11.2 13.6 16.0 18.3 20.6 24.0 29.2
Printing Paper – Comm. Ledger – 75% Rag
1% Ash
Paper M.F. Newsprint – 24% Ash
Paper White Bond Rag – 1% Ash
Paper Writing – 3% Ash
3.2
2.1
2.4
3.0
4.2
3.2
3.7
4.2
5.0
4.0
4.7
5.2
5.6
4.7
5.5
6.2
6.2
6.1
6.5
7.2
6.9
7.2
7.5
8.3
8.1
8.7
8.8
9.9
10.3
10.6
10.8
11.9
13.9
13.2
14.2
Textile Cotton – Absorbent
Cotton – American-cloth
Cotton – Sea Isle-roving
Hemp – Manila and Sisal
Jute – Average Grade
Linen – Dried Spun – Yarn
Rayon – Celulose – Acetate – Fibre
Rayon – Cupramonium – Average
Skein
Rayon – Viscose Nitrocel
Silk – Raw Chevennes-Skein
Wool – Australian-Marino-Skein
4.8
2.6
2.5
2.7
3.1
3.6
0.8
4.0
4.0
3.2
4.7
9.0
3.7
3.7
4.7
5.2
5.4
1.1
5.7
5.7
5.5
7.0
12.5
4.4
4.6
6.0
6.9
6.5
1.4
6.8
6.8
6.9
8.9
15.7
5.2
5.6
7.2
8.5
7.3
1.9
7.9
7.9
8.0
10.8
18.5
5.9
6.6
8.5
10.2
8.1
2.4
9.2
9.2
8.9
12.8
20.8
6.8
7.9
9.9
12.2
8.9
3.0
10.8
10.8
10.2
14.9
22.8
8.1
9.5
11.6
14.4
9.8
3.6
12.4
12.4
11.9
17.2
24.3
10.0
11.5
13.6
17.1
11.2
4.3
14.2
14.2
14.3
19.9
25.8
14.3
14.1
15.7
20.2
13.8
5.3
10.0
16.0
18.8
23.4
Tobacco Cigarette 5.4 8.6 11.0 13.3 16.0 19.5 25.0 33.5 50.0
Wood Timber – Average
Glue – Hide
3.0
3.4
4.4
4.8
5.9
5.8
7.6
6.6
9.3
7.6
11.3
9.0
14.0
10.7
17.5
11.8
22.0
12.5
Miscellaneous Charcoal-Steam Activated
Gelatin
Silica Gel
Soap
Starch
7.1
0.7
5.7
1.9
2.2
14.3
1.6
9.8
3.8
3.8
22.8
2.8
12.7
5.7
5.2
26.2
3.8
15.2
7.6
6.4
28.3
4.9
17.2
10.0
7.4
29.2
6.1
18.6
12.9
8.3
30.0
7.6
20.2
16.1
9.2
31.1
9.3
21.5
19.8
10.6
32.7
11.4
22.6
23.8
12.7
NOTE: Moisture content expressed in per cent of dry weight of the substance at various relative humidities –
Temperature 75°F.