TM 1-1500-204-23-7
Table 3-1. Minimum Penetration Time For Penetrants
Water
Post
washable
emulsified
Type of
penetration
penetration
Material
Form
discontinuity
time (minutes)
time (minutes)1
Steel
Castings
Porosity
30
102
Cold shuts
30
102
Extrusions and
Laps
N/R
10
forgings
Welds
Lack of fusion
60
20
Porosity
60
20
All
Cracks
30
20
All
Fatigue cracks
NR
30
Brass and
Castings
Porosity
10
52
bronze
Cold shuts
10
52
Extrusions and
Laps
N/R
10
forgings
Brazed parts
Lack of fusion
15
10
Porosity
15
10
All
Cracks
30
10
See footnotes at the end of table.
3-7