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Toxics Use Reduction Institute · Surface Solutions Laboratory
Toxics Use Reduction Institute

Surface Solutions Laboratory

Trial Report

Trial Number 5

(Client Number 155, Project Number 1)

Trial Purpose: Evaluating additional cleaners for removal of reed wax.

Date Run: 08/28/01

Experiment Procedure:
Four cleaners were selected based on the results from the successful previous trial. A fifth cleaner was added based on client request. All five solutions were used at full strength. Four products were heated to 140 F on a hot plate and the fifth, Uni-Clear, was heated to 100F in a heated water bath (due to its low flash point of 140 F).
Fifteen preweighed coupons were coated with the supplied Reed wax. The wax was heated with a hot air gun and a moderate layer was added to the coupon. These coupons were then allowed to cool to room temperature and weighed again. Three coupons were immersed in each of the cleaners. Observations were made at 5, 10, 15, 20, 30 and 45 minutes. After the final observation, the coupons were rinsed in DI water and dried using air blow off. Coupons were then weighed a final time and percent efficiencies were calculated for each cleaner.

Trial Results
Of the five products evaluated, only two removed over 85% of the wax from the coupons.  The Buckeye Shopmaster RC removed 88% and the Universal
Photonics Uni-Clear removed 99.97%. The other three removed less than 5% of the wax.  Table 1 lists the efficiencies for each cleaner and coupon.

Table 1.  Cleaning Efficiencies                        
              Shopmaster Safe Strip  DBE-4 590 S    Uni-Clear
Coupon 1      94.71      2.18         1.08      1.36      100.00
Coupon 2      91.48      1.38        -2.30      2.62      100.02
Coupon 3      77.49      2.08         0.12      5.70        99.89
Average       87.89      1.88         -0.37      3.23        99.97

Despite the low efficiency, DuPont?s DBE-4 showed signs of altering the wax during the 45 minute cleaning.  The cleaning chemistry softened the wax
during the first 5 minutes of cleaning.  By 30 minutes, the wax was sliding down the coupons and gathering at the bottom.  Table 2 lists the
observations made during the 45 minutes of cleaning.

Table 2.  Observations                        
Times Shopmaster RC                 Safe Strip             DBE-4                    590 S                Uni-Clear
5        very soft-dissolving            Slightly soft          very soft-dissolving no change        good dissolving
10      good dissolving 50% gone  some dissolving   good softening        little softening  almost all clean
15      coming off in clumps           no change           some dissolving      no change        1 all clean
20      80% gone                           no change            sliding down            no change        little remaining
30      very soft, most gone           okay                    softer                       darker color      all gone after 25 min
45      clumps floating at top          no change           no change               no change        n/a

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

Shopmaster RC and Uni-Clear were very successful in removing the wax. Uni-Clear will be further evaluated for cleaning the Crystalbond 590.