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MIL_STD_1246C.131.pdf
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MIL_STD_1246C.131.pdf
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I METRIC
I
XIL-Sm-1246C
11
April 1994
SUPERSEDING
MIL-STD-l246B
4 September 1987
MILITARY STMDARD
PRODUCT CLEANLINESS LEVELS
CONTAMINATION CONTROL
PROGRAM
.-.
..
AMSC N/A
distribution is unlimited
FSC 3694
Approved for public release;
Downloaded from http://www.everyspec.com
.—
I
I
MIL-sTD-1246C
FOREWRD
!
1. This military standard is approved for use by all
Departments and Agencies of the Department of Defence.
I
2.
Beneficial comments ( recommendations, additions,
deletions) and any pertinent data which may be of use in
improving this document should be addressed to: Commander, U.S.
Army Missile Conmand, Al’TN:
AMSKI-RD-SE-TD-ST, Redstone Arsenal,
AL 35898-5270 by using the Standardization Document Improvement
Proposal (DD Form 1426) appearing at the end of this document or
by letter.
3.
This standard contains requirements for the
establishment of a uniform method for specifying product
cleanliness levels and contamination control program
requirements.
.’.
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MIL-sTD-1246C
CONTENTS
I
I
1.
SCOPE ............................s”+=”.==--”. -“””-”1
1.1
scope .......
...............*..*.. ...0... ......
1
1.2
Use .......................-.---.-.-.---”” -.-..1
1.3
Applicability .................-*=oo.0=0..o=”o.1
1.4
Background ...............-...00--==o=oo=o”ooc “1
1.5
Safety ...................-+.””.O=”=O=”D.OOO.O”l
2.
APPLICABLE
DKUMHTS .........*..... ...==”” ”””””””””2
2.1
Governxnent documents.. ........................2
2.1.1
Stiecifications, stanardst and hsn~ks””o --”.2
2.2
Non-Gove
rnment publications.. ........-.O...OOOQ
2.3
Orderof precedence. ..........................4
3.
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
DEFINITXWS ...............--..=oo=o”o ***o”*** ‘**-*”5
Cleanliness level .............................5
Collected volatile condensable material
(CVCM)
..............
● 0..... ..............----
.5
Contaminant ..............-.--””=.-.””.””..- ..-5
Contamination ...-..-. .-..-..-DO”-”.”.”.-”= -“”.5
Contamination Control. ...............=N...... .5
Demonstrated equivaleXAcee.............”.....OO.
5
Micrometer @n)
........................*..*
● .-
5
Non-vo18tile residue (Hloa.eooo.a=o=”=”””.” “s
Particle percent area coverage ................-5
Particle size..o..... .....-..”do”=””=”=-.== “==5
Point of contact .........-..OO.O””- O-==”==” ““”5
Significant surface.. ...-.-...”. .OOOO O”===“=.-6
Total mass loss (m) ........oOoaOeOOO* ●=o=c”. fi
Turbidity
..........................0. ........*
6
Volatile condensable material (vCM)............6
4.
G~ RWJI
REGENTS ........*.-.....* ●“””””””””””””7
4.1
Contamination control program ..................7
4.1.1
Responsibility .............*.o=o===”Dco-=0===0 7
4.1.1.1
Prescribing products cleanliness ...............7
4.1.1.2
Achieving and maintaining product cleanliness.7
4.1.1.3
Assuring the integrity and continuity of the
contamination control effort ...................7
4.2
Methods for specifying products cleanliness
levels ................-....s”-”..”-”-.””.”..””7
4.3
Log-log2 distribution of particles ............lO
5.
DETAILED REQUI
REGENTS..*..........+*. ●...** **”” ”””13
5.1
Cleanliness levels... .............O...O.””” ““13
5.1.1
Application of cleanliness levels .............l3
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MIL-STD-1246C
5.1.2
5.1.2.1
5.1.2.2
5.1.2.3
5.1.2.4
5.1.2.5
5.1.2.6
5.1.2.7
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.3
5.4
5.4.1
5.4.2
5.4.3
5.4.4
5.4.5
5.4.6
5.4.7
5.4.8
5.4.9
6.
6.1
6.2
6.3
6.4
6.5
I.
II .
III.
IV.
v.
Measurement of cleanliness levels .............ld
Direct measurement ...........................14
Extractive Sampling ..........................14
Indirect sampling ...................=-...””” -14
Percent area coverage ..........--.....-”. ..--15
Alternative particle count specifications. ....15
Volatile condensable mtarial .................16
~rbidity ............=. .-.=OO-”-OD ==O=O.O” .0017
Statistical analysia
of data. .o........o......17
Poisson statistics.. .......O.O.OF.-.”.”.” “...17
Student’8t @WIYs%B =”””-D.Y~..”...0.0-C.-...-=7
Transformation of data .......................17
Number ofsaxrq)les............................18
Recording of data.... ..........=..000=o.o”. ..18
Detailed requirements for contamination
control plan .................................18
Design requirements ..........................
19
Contamination Control Responsibility ..........19
Processes and controls ...............F>.......19
Environmental Control. .......................19
Sub-tier contractors.. ........O..............19
Calibrations procedures ......................19
Quality control do.-..... ..-.......-..-.......19
Product protection ...........................20
Personnel ...............---..-””...--”..-.. .=20
NOTES................*”.
● .**”*””””.”.” ”””””...... -21
Intended use ......=-.. ....owoo”.=~~”......... 21
Issue of DODISS .............=-.-.”..”..”..”.. 21
Additional info-tion .......................21
Subject te~ {key W=d) listing”...”22.......”22
Changes frm previous issue ..................22
Particle Cleanliness Levels ........................9
Non-Volatile Residue Cleanliness Levels ............ll
Sanpling and measurement technics for surfaces,
liquids, and gases ..............................15
Calculating particle percent area coverage .........l6
Gross cleaning processes ..........................26
Iv
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MIL-sTD-1246C
FIGURE
1.
Product Cleanliness levels ...................22
APPENDIX CLEANING METHODS AND WTERIALS” ...............23
10.
GENERAL ...............-0.-..o*=.-.*..-o*..... ●*”.=23
10.1 scope .....-..-....-””.” ““”.””””””””””””””.”=”23
20.
APPLICABLE DOC~S ..............................23
300
DEFINITIONS.../ ..........o...00o0=*.=**.=*... ●..--23
40. GENERAL REQUI
R.EMENTs............-..= ““..”....”...”23
40.1
40.1.1
40.1.1.1
40.1.1.1.1
40.1.1.1.2
40.1.1.1.3
40.1.1.1.4
40.1.1.1.5
40.1.1.1.6
40.1.1.1.7
40.1.1.1.8
40.1.2
40.1.2.1
40.1.2.2
40.1.2.2.1
40.1.2.2.2
40.1.2.2.3
40.1.2.2.4
40.1.2.2.5
40.1.2.2.6
40.1.2.2.7
40.1.2.2.8
40.1.2.2.9
40.1.2.3
50.
50.1
50.2
50.3
60.
60.1
60.1.1
60.1.2
60.1.3
60.2
Cleaning methods and materials ................23
Gross cleaning ...............................23
Gross clea.ningtYPes. ........................24
Acid cleaners ............-.””o-=” ”0000=00= ““=24
Alkaline cleaners ............................24
Detergents and mild cleaners .................24
Organic solvent cleaners .....................24
Tap water and deionized water ................24
Neutralizing and passivating solutions ........24
Mechanical cleaning. .........................24
Gross cleaning processes .............;:.......25
Precision cleaning ...........................25
precision cleaning solutions/fluids ...........25
Precision cleaning methods/processes ..........25
Solution cleaning ............................27
spray cleaning .............-ODO.=-””””””””” ““27
Sonic cleaning ...............................27
Vapor cleaning ........................O.==- .-~~
Flush cleaning
● .......*.**.- ● ...**. ● .*..*- ● -*
spinrinse/drying.*.=. .~=-.=-=..”=”=””””=”..= 28
Electropolishing and ch~cal Xlishing. -=.===28
Other methods ................................28
Ozone depleting substances ...................28
Handling during cleaning. ....................28
PROTECTION ................=~..*.o*”=o*.=oo.* ●*-*.*29
Cleanliness protection .......................29
Precision clean packaging ....................29
Storage ....e......a........-...”.”.”. ””.”..””29
INSPECTION .................=.....”.=”-.”=”..-. ‘=0”30
Inspection ......................”” ..O.OGOOO “+30
Breaking of a closure ........................30
Inspection requiring opening of a packaga ....3O
Traceability .................*o*..o”o.o.”=.. “30
Issue of DODISS ...............................30
..
v
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