(c)  
Type III – Cleaning prior to adhesive bonding.

(d)  
Type IV – Cleaning prior to organic coating (including painting).

(e)  
Type V – Paint removal.

(f)  
Type VI – Rust removal.

(6)  
For Type 1 cleaning applications, materials that meet the requirements of MIL-PRF-87937 or MIL-C-29602 may be used.

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B.  Test Methods for determination of Acceptable Alternate Cleaners. Table 202. Test Application
TEST  TEST METHOD  TYPE4 
I  II  III  IV  V  VI 
Etch Rate1  204A  X  X  X  X 
Sandwich Corrosion1  204B  X  X  X  X  X 
Intergranular Attack  204C  X  X  X  X 
Cleaning Ability  204D  X  X  X  X  X 
Chemical Analysis  204E  X  X  X  X  X  X 
Hydrogen Embrittlement1  204F  X  X  X  X  X 
Stress Corrosion and Hydrogen Pickup of Titanium1,2  204G  X  X  X  X 
Immersion Corrosion1  204H  X  X  X  X  X 
Effect on Painted Surfaces  204J  X  X  X  X 
Acrylic Crazing Test  204K  X  X  X  X 
Residue  204L  X  X  X  X 
Cleaning Prior to Florescent Penetrant Inspection (FPI)  204M  X 
Cleaning Prior to Bonding  204N  X 
Cleaning Prior to Painting  204P  X 
Cleaning Prior to Painting (Magnesium)3  204Q  X 
Dissimilar Metals Corrosion  204R  X 
Sodium Hydroxide Base Remover  204S  X 

1 – Test shall be performed for aqueous and semi-aqueous cleaners (which includes all alkaline and
acidic solution). This test is not necessary for purely organic solvents. 2 – Test must be performed for cleaning products, which will be used on Titanium alloys. 3 – Test must be performed for cleaning products, which will be used on Magnesium alloys. 4 – X = Test applies to this type.
(1)  Method No. 204A: Etch Rate Corrosion Test
NOTE:  This test shall be performed for aqueous and semi-aqueous cleaners (which includes all alkaline and acidic solutions). This test is not necessary for purely organic solvents.
(a)  
Immerse each of the materials (listed in Table 203) panels with at least 4 square inches (2580 millimeter squared) of total surface in the cleaner for 24 ± 0.5 hours.

(b)  
The testing shall be done at the maximum operating temperature and concentration of the solution to be used during processing of parts.

(c)  
The degreasing solution shall not cause etching or corrosion of the metal.

(d)  
The maximum allowable weight change for each material shall be listed in Table 203.

Cleaning
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Table 203. Material Weight Change
Material  Weight Change (mg/sq. in./24 Hr) 
Bare aluminum (2024-T4 or T6)  2.5 
Magnesium (AZ31)  5 
Bare low alloy steel (AISI 4130)  7.5 
Cadmium plated steel (plate in accordance with QQ-P-416, Type II, or AMS 2400)  2.5 
Titanium 6 – 4  1.25 
Nickel – based alloy (INCO 625 or INCO – 718)  7.5 
Ferrous alloy A286  7.5 
Stainless Steel Alloys  7.5 

(2)  Method No. 204B: Sandwich Corrosion Test
　
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