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Anodic Coating Designations
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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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