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Trial Number 1

Trial Purpose:

To evaluate non-aqueous alternatives for removing the supplied lacquer

Date Run:


Experiment Procedure:

Seven additional products were selected from the lab's on-line database,, based on past testing results matching client supplied information. All of these products were used at full strength as recommended by the vendor. All eight products were used at room temperature.
Twenty-one preweighed 5052 Aluminum coupons were coated with the Stan Chem Inc Red Stop Off (78-93-3, 108-88-3) lacquer using a handheld swab. The coating was allowed to dry for about an hour. Once dry, the coupons were weighed a second time to determine the amount of Red Stop Off applied.
Three coupons were immersed into each solution and cleaned for 5 minutes using stir-bar agitation. Rinsing was performed for 15 seconds using tap water heated to 120 F and followed by 30 seconds of air blow off with dry compressed air at room temperature. Final weights were recorded and efficiencies were calculated for each coupon cleaned.

Trial Results:

As was the case for the Ink Zapper, nearly all of these products showed visual signs of removing the red lacquer but had negative cleaning efficiencies. The negative number implies that the solutions were being absorbed into the lacquer, increasing the final weights above the initial dirty weights. Visually inspecting the cleaning solutions revealed that several of the products had turned different shades of red during the 5 minutes of cleaning. The table below lists the amount of lacquer added, the amount remaining, the cleaning efficiencies and observations made for each product.

Cleaner Initial wt Final wt % Removed Solution color Visual Rank
DS 144 S 0.1954 0.1964 -0.51    
  0.2292 0.2298 -0.26 light pink 3
  0.1571 0.1574 -0.19    
DS 800 0.2582 0.2556 1.01    
  0.1624 0.1590 2.09 no change 7
  0.3013 0.2924 2.95    
Solsafe 245 0.3884 0.3914 -0.77    
  0.1490 0.1553 -4.23 pink 2
  0.2428 0.2488 -2.47    
SC Actisolv 0.2466 0.3059 -24.05    
  0.2067 0.2675 -29.41 slight pink 5
  0.3266 0.3856 -18.06    
D Greeze 500 Lo 0.1272 0.1503 -18.16    
  0.2409 0.2668 -10.75 slight pink 4
  0.1336 0.1422 -6.44    
Shopmaster RC 0.3005 0.6950 -131.28    
  0.2065 0.4678 -126.54 red 1
  0.2224 0.5364 -141.19    
Soy Clear 1500 0.3100 0.3293 -6.23    
  0.2665 0.2934 -10.09 no change 6
  0.2833 0.3041 -7.34    

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.


The products that changed to a pink/red color will be retested at a longer time, higher temperature and with ultrasonic energy.

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