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Evaluating Mid-Gloss Black
What is the best way to evaluate the black color, which has 60° gloss of 55–65 units?
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Trivalent Chromates
One of the tried and true testing methods for hexavalent chromium is the use of 1,5-diphenylcarbazide to form a colored complex with hexavalent chromium. The intensity of the color is measured colorimetrically. The colored complex does not form with trivalent chromium. Why has the test taken on added significance?
Read MoreEvaporation Water Loss
Do you know of any papers or charts that give water evaporation rates? We have an opportunity to reduce our cleaner tank temperature from 180 to 80°F and want to know how much water we can save.
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Glass Bead Blasting?
We are blasting small (1-inch diameter × 3/4-inch) zinc die castings to remove light flash and impart an isotropic finish. Our customer has seen some similar parts that were airblasted with approximately 100 mesh glass beads, and he prefers that finish. Could we provide a similar finish if we changed from the small steel shot to glass beads?
Read MoreViscosity Cups Revisited
There are numerous ASTM Specification covering dip and laboratory-type viscosity cups which address both precision and correct method of use. The importance of temperature control and the nature of Newtonian flow cannot be stressed more and is often overlooked to the detriment of flow cups in general.
Read MoreDip-Spin Painting Equipment
I am interested in finding out information regarding the size of the market for dip spin finishing equipment. Information regarding suppliers of the coatings and equipment would be helpful.
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