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To continue the search for a cleaner that will remove the same contaminant.
Eight solutions were selected from the lab’s All Tests database based on past effective cleaning of similar contaminants. Four products were diluted to 20% in 600 ml beakers using DI water. The other products were used at 100%. The solutions were heated to 130 F on a hot plate.
Twenty-four pre-weighed coupons were contaminated and weighed again. Three coupons were placed in each cleaner for five minutes with stir-bar agitation. Coupons were rinsed in a tap water bath for 30 seconds at 120 F and dried using a Master Appliance Corp, Hot-air gun model HG-301A. One coupon from each set was wiped with a paper towel. Observations were recorded and weights were measured. The remaining two coupons were re-immersed into the cleaning solutions and soaked at room temperature for 30 minutes, rinsed observed, wiped clean and weighed. Efficiencies were calculated for all eight products.
SUBSTRATE MATERIAL: Stainless Steel coupons
CONTAMINANTS Ashland Specialty Chemical Co, Acrylic Resin solution, Aroset 1872 Z 40 (CAS#s: 108-88-3, 141-78-6, 142-82-5, 67-63-0)
CONTAMINATING PROCESS USED: Coupons were coated with contaminant with a hand held swab. Coupons were then allowed to dry for one hour.
The four products used at full strength showed good cleaning after the first five minutes of cleaning. The coupons that were wiped ranged from 87 to 96% removal. The four products used diluted only removed under 20% of the contaminants and only improved to about 40% after the 30 minute cleaning. Table 2 lists the calculated efficiencies for both cleaning times. The observations made at each period of cleaning were recorded in Table 3.
|Table 2. Cleaning Results|
|Cleaner||Valtron||Daraclean||All Purpose||Bio T 300 B||Resineater||D-Greeze||69 MC||SI #4|
|5 min with wipe||7.82||9.33||9.96||93.29||92.23||87.25||16.92||95.96|
|30 min with wipe||1.50||15.75||28.14||94.90||96.46||97.76||15.52||102.69|
|Table 3. Observation|
|Valtron||Daraclean||All Purpose||Bio T 300 B||Resineater||D-Greeze 500||69 MC||SI #4|
|5 min w/ wipe||sticky, hard||sticky, hard||dull, sticky||soft||soft||soft, sticky||hard, sticky||easy wipe|
|easy wipe||easy wipe||not mix w/ water|
|30 min w/ wipe||poor wipe||poor wipe||poor wipe||little remaining||easy wipe||some residue||poor wipe||easy wipe|
|rub off||not sticky||not sticky||easy wipe||OK wipe||not sitcky||very messy|
|rub off||rub off|
Success Rating:A follow up test, usually based on company input.
Envirosolutions, Fingerlakes and Sovlent Kleene all had products that removed the contaminant with relative little difficulty. Even though the Savogran product had a high efficiency, the rinsing of the coupons created a white film. When the coupons were removed to be wiped, there was a lot of the cleaning solutions remaining on the coupons which had to be wiped off in addition to the contaminant.