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To evaluate several aqueous cleaners for the removal of the PVA.
Seven cleaners were selected based on vendor information and the lab’s Effective Test Conditions Database. One cleaner was not available for testing and will be evaluated at a later date. Water was selected as the control. Cleaners were made into 2% solutions using DI water in 600 mL beakers.
Twenty-one coupons were weighed prior to cleaning. Three coupons were cleaned in each solution for five minutes using stir-bar agitation. Parts were rinsed for two minutes in DI water at room temperature. The parts were dried in a convection oven at 212 oF for 15 minutes. After allowing parts to cool to room temperature, final weights were recorded. If weights did not change, the cleaner would be retested at a 5% solution with new coupons. If weights went down, the cleaner would be used in the next phase of testing.
SUBSTRATE MATERIAL: Ceramic-Alumina parts
CONTAMINANTS: DuPont Evanol (Vinyl Alcohol Polymers & Copolymers CAS#s: 9002-89-5, 25213-24-5, 54626-91-4; Methanol Bulk/Packaged CAS #: 67-56-1; Sodium Acetate CAS#: 127-09-3)
All products tested at the 2% concentration caused the weights to be decreased. Table 2 lists the weight loss from cleaning. No 5% testing was needed.
Table 2. Weight Changes
|Cleaner||Initial wt||Final wt||Weight Loss|
Success Rating:Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
All solutions tested decreased the weight of the parts. Further evaluation will proceed with all selected cleaners.