To find an effective solvent to remove varnish from steel coupons
Date Run:
07/20/2023
Experiment Procedure:
Three steel coupons were used for each cleaner tested, for a total of nine coupons. Initial weights of coupons were taken. The varnish was heated to 350 F on a hot plate. Each coupon was placed on the hot plate for a total of 30 seconds. The varnish was then applied to the heated coupons with a metal scraper in order to achieve a thin layer of varnish on the bottom third of the coupons. Once the varnish had solidified, dirty weights of each coupon were taken. Coupons were then subjected to 15 minutes of unheated immersion with a stir bar set at 100 rpm. The chosen solvents tested were A. Xylene 98.5% (for comparison), B. SC Actisolv Safety Solvent 100%, C. Dimethyl Glutarate 98%. Coupons were removed and left to air dry. Clean weights were then taken.
Trial Results:
Cleaner
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
Xylene 98.5%
0.0724
0.0025
96.55
95.96
0.0531
0.0037
93.03
0.0415
0.0007
98.31
SC Actisolv Safety Solvent 100%
0.0307
0.0304
0.98
2.26
0.0213
0.0204
4.23
0.0698
0.0687
1.58
Dimethyl Glutarate 98%
0.0213
0.0212
0.47
0.48
0.0306
0.0306
0.00
0.0103
0.0102
0.97
SC Actisolv Biobased Solvent: Varnish just beginning to flake off at 15 minutes of unheated immersionDimethyl Glutarate: No Change
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Neither SC Actisolv Biobased Solvent 100% or Dimethyl Glutarate 98% were effective in removing varnish using unheated immersion. They may show some promise with the addition of heat and/or ultrasonics.
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