Extinction 585 nm
1-0.5h 1-1.0h 1-1.5h 1-2.0h 1-2.5h 1-3.0h 2-0.5h 2-1.0h 2-1.5h 2-2.0h 2-2.5h 2-3.0h 3-0.5h 3-1.0h 3-1.5h 3-2.0h 3-2.5h 3-3.0h 4-0.5h 4-1.0h 4-1.5h 4-2.0h 4-2.5h 4-3.0h 5-0.5h 5-1.0h 5-1.5h 5-2.0h 5-2.5h 5-3.0h
t
DECONTAMINATION
For the temperature we tested 45˚C, 55˚C and 60°C. Concentration of cleaner was 0.2%, 0.5% and 1%. We did a visual inspection after one, six, 24 and 96 hours. The sample preparation and test procedure were as follows:
Each individual material was placed in a glass beaker of appropriate size with lid. A solution of the detergent in the specified concentration was prepared with DI water and filled into the beaker. When possible, materials were only immersed approximately 2/3 of their full size to have “treated” and “untreated” areas on the same piece. The beakers were placed in a heated water bath at the chosen temperature. A temperature logger (Ebro) was added to monitor the water temperature in the bath. For easier analysis and comparison, one piece of each material was used for each time interval. After the duration of the test, all samples were rinsed with DI water and photographed for documentation. For the second test, we wanted to have not only a visual inspection as a result, but also a measurable method. It was therefore decided to execute additional tests with blue anodised aluminium.
Discolouration kinetics with blue anodised aluminium
As an addition to the immersion test with visual inspection (part A) individual tests were conducted with blue aluminium. Coloured aluminium is not expected to be affected by corrosion; however, the colour often slowly fades due to chemical exposure
0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Soaked in solution Material compatibility test for colour anodised aluminium-blue/softened water-5ml/l-60˚C
Graph 1. The results for the newly developed discolouration kinetics test. The colour loss curve of blue aluminum in 0.5% solution shows the different extinction with reference to amount of colour, which every cleaning chemical was able to dissolve from the test body
NOVEMBER 2019
WWW.CLINICALSERVICESJOURNAL.COM I 79 Belimed Protect Mild Alkaline Enzyme Cleaner
Detergent A (mild alkaline enzymatic detergent)
Figure 2. Results of immersion test with visual inspection for aluminium silver with 0.5% and 55 ˚C measured after 0, 1, 6, 24 and 96 hours of exposure
and therefore creates a negative aesthetic effect. This effect varies depending on the detergent / concentration / temperature combinations. The immersion test was conducted as described previously (see part A), with the exception that the evaluation
Belimed Protect Mild Alkaline Enzyme Cleaner
was performed by measuring the absorption of colour in the solution the plates were immersed into. A photometer was used to analyse the samples. A value for “how much colour” is lost from the aluminum plates is calculated and each analysis gives a new
Belimed Protect Neutral Enzyme Cleaner Detergent A
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