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To evaluate several potential replacement cleaners and compare them to current cleaner.
Five cleaning chemistries were selected based on vendor supplied information and from searching the lab’s Effective Test Conditions Database. A sixth chemistry, supplied by the client, was included in the testing. Each solution was made into 5% solutions using DI water in 400 mL beakers. These solutions were then heated to 130 F on a hot plate. Tap water was also used to clean coupons.
Twenty-one preweighed coupons were contaminated with the metal working fluid supplied by the client. Coupons were weighed after contamination. Three coupons were cleaned in each solution for three minutes using stir-bar agitation, then rinsed for 30 seconds in a tap water bath at 120 F. Drying was performed using Master Appliance Corp, Hot-air gun model HG-301A at 500 F for one minute. Final weights were recorded and cleaning efficiencies were calculated.
SUBSTRATE MATERIAL: 304 Stainless Steel coupons
CONTAMINANTS: Metal working fluid (Hangsterfer’s S-500CF_US)
CONTAMINATING PROCESS USED: Coupons were contaminated using hand-held swab
*A sample of one of the client requested cleaner’s, Brulin 815 GD, has been ordered by the lab and will be tested
All of the cleaners tested, including the water, were very effective in removing the metal working fluid from the stainless steel coupons. There was noticeable residue on all the coupons without 100% cleaning. Table 1 lists the efficiencies for each cleaner tested.
Table 1. Cleaning Efficiencies
CONTAMINANTS SUBSTRATES EQUIPMENT
Brulin: This is a table listing vendor supplied information on the products.
Matchless: Find it in chem search new in My Documents or in the client notebook.
Success Rating:Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
All cleaners tested removed over 98% of the metal working fluid from the stainless steel coupons. The next test will be to evaluate cleaning of the three cleaners with 100% efficiencies using lower concentrations (1 and 3% by volume).