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Technical Information >> (3B) solid contents Measuring of Electrophoretic lacquers
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Solid content test methods
There are two methods of measuring Solid Contents of Lacquer in bath solution
Method A: Reflectro meter Brix Reading for specific lacquers
Method B: Oven test for greater accuracy.
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Method A:
1. Equipment
Reflectrometer
2. Method
Place few drops of bath solids on reflectro meter lens and look at light through eye piece to take reading. This method is not 100% accurate but convenient to be conducted at work place to get quick reading.
To measure solid contents of each lacquer please refer to following graphs which illustrates reflectrometer reading against solid contents. (Please note the reading varies with various lacquers)
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Reflectrometer Brix Graph Reading for Shinex Acrylic LB30 Lacquer
If the reading is 6 means there is 4% solid in the bath
If the reading is 9 means there is 6% solid in the bath
If the reading is 12.6 means there is 8% solid in the bath
If the reading is 15.4 means there is 10% solid in the bath
Note: It is recommended that bath operates @ 7-9% solids. If bath is running at 4% solids then you will have to add solvents to stop the pitting problem, alternatively add lacquer to maintain recommended level of solids in bath. Voltage and Seconds combination will give required micron thickness. Higher the voltage quicker the coating longer the time thicker the coating.
If dye is added, due to presence of BG solvent in dye the reading will change. Following reading is for low solids dye where solvent levels will increase and reading will change as:
Reading for Shinex Acrylic LB30+100ml/l dye
If the reading is 8.2 means there is 4% solid in the bath
If the reading is 11.4 means there is 6% solid in the bath
If the reading is 14.4 means there is 8% solid in the bath
If the reading is 17.6 means there is 10% solid in the bath
Reading for Shinex Acrylic LB30+120ml/l dye
If the reading is 9.4 means there is 4% solid in the bath
If the reading is 12.4 means there is 6% solid in the bath
If the reading is 15.4 means there is 8% solid in the bath
If the reading is 18.4 means there is 10% solid in the bath
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Method B:
1. Laboratory requirements
Lab oven capable of maintaining temperature of 120°C ± 2°C
Balance with accuracy to four decimal places
2. Method
Weigh approximately 1 gram of bath sample accurately in to an aluminium dish (A)
Place in oven at 120°C for 1 hour
Remove from oven, allow to cool and re-weigh (B)
3. Calculations of solids percentage
B/A x 100 = % solids
(B divided by A times 100 is equal to percentage of solids)
4. Correction
Addition of 1 litre lacquer concentrate per 100 litre of working solution will increase solid contents by 0.25%.
For more information write to us on
info@shinextechnologies.co.uk
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