Elcometer 266 - Page 42

APPENDIX B: CALCULATING THE CORRECT TEST VOLTAGE (cont)
TABLE 1: kV values from ASTM G62-87 (up to 1 mm)
Microns
Kilovolts (kV)
Thou/Mils
Kilovolts (kV)
100
1.04
5
1.17
200
1.47
10
1.66
300
1.80
15
2.03
400
2.08
20
2.34
500
2.33
25
2.63
600
2.55
30
2.88
700
2.76
35
3.11
800
2.95
40
3.32
900
3.12
-
-
1000
3.29
-
-
TABLE 2: kV values from ASTM G62-87 (above 1 mm)
mm
Kilovolts (kV)
Thou/Mils
Kilovolts (kV)
1
7.84
40
7.91
2
11.09
80
11.18
3
13.58
120
13.69
4
15.69
160
15.81
5
17.54
200
17.68
6
19.21
240
19.36
7
20.75
280
20.92
TABLE 3: kV values from NACE RP0188-99
mm
Thou/Mils
Kilovolts (kV)
0.20 to 0.28
8 – 11
1.5
0.30 to 0.38
12 – 15
2.0
0.40 to 0.50
16 – 20
2.5
0.53 to 1.00
21 – 40
3.0
1.01 to 1.39
41 – 55
4.0
1.42 to 2.00
56 – 80
6.0
2.06 to 3.18
81 – 125
10.0
3.20 to 3.43
126 – 135
15.0
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