The chemical finishes and comparative anodic coatings charts are designed as guidelines that match processing and required anodic film thicknesses with customer needs.
Chemical Finishes
|
Type of Finish
|
Alcoa Designations
|
Alum. Assn. Designations
|
Description
|
Examples of Methods of Finishes (Not Definitive Techniques)
|
|
Non Etched Cleaned
|
|
C-10
|
Unspecified
|
|
|
|
|
C-11
|
Degreased
|
|
|
|
|
C-12
|
Inhibited
Chemical
Cleaned
|
Organic solvent treated
Inhibited chemical type cleaner used
|
|
|
|
C-1X
|
Other
|
To be specified
|
|
Etched
|
|
C-20
|
Unspecified
|
Trisodium phosphate, 3-6 oz.,/gal. used at 140-160°F for 5 min.
|
|
|
|
C-21
|
Fine Matte
|
|
|
R1
|
C-22
|
Medium Matte
|
Sodium hydroxide, 4-6 oz./gal. used at 140-160°F for 5 min.
|
|
|
R2
|
C-23
|
Course Matte
|
Sodium fluoride, 1½ oz. plus sodium hydroxide 4-6 oz./gal. used at 140-160°F for 5 min.
|
|
|
R3
|
C-2X
|
Other
|
To be specified
|
|
Brightened
|
R5-bright Dip* EB10, EB30 Bright Dip
|
C-30
|
Unspecified
|
Chemical bright dip solution of the proprietary phosphoric nitric acid type used or proprietary electrobrightening.
|
|
|
C-31
|
Highly Specular
|
|
|
|
C-32
|
Diffuse bright
|
Etched finish C22 followed by brightened finish C31.
|
|
|
|
C-3X
|
Other
|
To be specified
|
* Trade Name of Aluminum Company of America
Comparative Anodic Coating Designations
|
Film Thick-
ness
|
Alcoa Designation
|
Aluminum Association Designations
|
Descriptions
|
Type of Finish
|
Film Thick-
ness
|
|
.0001
.0002
.0003
.0004
.0005
.0006
.0007
up
|
Alumilite 200 .00015 minimum film thickness
------------------
Alumilite 201 .0002 minimum film thickness
------------------
Alumilite 202 .0003 minimum film thickness
Alumilite 203 .00036 minimum film thickness
------------------
Alumilite 204 .0004 minimum film thickness
------------------
Alumilite 214 .0007 minimum film thickness
|
A21
A22
A23
A2X
------------------
A31
A32
A33
A3X
------------------
A41
A42
A43
A4X
|
Clear (natural) coating
Coating with integral color
Coating with impregnated color
Other
------------------
Same as above
------------------
Same as above
|
Protective and decorative (coating less than 0.4 mils thick)
(Thickness to be specified by customer)
------------------
Architectural Class II (0.4 to 0.7 mil coating)
------------------
Architectural Class I (0.7 mil and greater anodic coating)
|
.
.0001
.0002
.0003
.0004
.0005
.0006
.0007
up
|
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