Test Panel Preparations

Coated and uncoated steel panels were prepared for field exposure as well as laboratory tests. 

---

Test Panel Preparation. Grit-blasted, steel Q-panels, 3 x 5 in were stored in protective paper inside a desiccator. Just prior to use they were rinsed with a 1/1 (by volume) mixture of mineral spirits and methyl ethyl ketone, allowed to dry, then rinsed with methyl ethyl ketone. Coatings were applied with a brush and thinned to uniform thickness with a number 24 helically wound (Meyer) rod. 

Field and Plant Tests Field exposure of test panels offers the benefit of a high degree of control over surface preparation and application. Moreover, through standardised exposure conditions, broader comparisons between both paint systems and locations are possible. More importantly, since replicates may be removed and laboratory tested periodically, changes in properties can be followed in considerable detail. At least four replicates should be examined for each exposure period to minimise the effects of atypical specimens. 

Oligomer and Film Characterization. Brookfield viscosity measurements were taken on a Model RVTD digital readout viscometer. Samples for Instron testing were prepared on glass plates using 25 or 75 pm (1.0 or 3.0 mil) Byrd film applicator. Coatings for cure speed and MEK double rub (MEKDR) studies were prepared on aluminum Q-Panels using a 40 wire wound rod (100 pm or 4.0 mil). 

This test (ASTM D529) evaluates the relative weather resistance of asphalt used for protective-coating applications, especially for roofing. No direct measure of outdoor life or service can be obtained from this test. Methods for preparing test panels (ASTM D1669) and failure-endpoint testing (ASTM D1670) are available. 

Storage Tests. Steaks prepared using the processing conditions in Table IX were evaluated at intervals in a one-year room temperature (24°C.) storage test. One set of samples taken from a single U. S. Choice round was irradiated to 3.0 megarads at room temperature to serve as internal panel controls. These samples were held at 24°C. for 1 week and then placed in — 20°C. storage. 

Test panel scores over the 12-month test period are shown in Table XI. Since the irradiation flavor scores of the product held at — 20°C. should not change appreciably with time, it appears that the indicated fluctuations in flavor intensity are caused by the taste panel and not by differences in the samples. Some panel evaluation difficulties were experienced with these samples, owing to a variable amount of edge charring which occurred during preparation of the steaks. The texture of these steaks remained good during the test period. 

Two resins were used to do the first study on laminate construction. The first was a brominated epoxy vinyl ester resin with antimony pentoxide and the second was a brominated unsaturated polyester resin. They were both promoted to cure at room temperature with methyl ethyl ketone peroxide catalyst. The panels were then postcured at 250°F (121°C) for 8 h. Panels were prepared that varied in glass content from 25% to 70% and panel thickness varying from 0.05 in. to 0.25 in. and were tested at the same testing facility. A summary of the FSI test data for the first set of panels tested are shown in Figures 23.1 and 23.2. This graph in Figure 23.1 plots the FSI value versus the panel thickness. This data would indicate that the thickness of the test panel has no effect on the measured... 

Figure 32.13 Corrosion widths of SO2 salt spray-tested chromate-free plasma coating systems of IVD panels prepared under IVD conditions and their chromated controls.

Specimens for the LSDC tests were prepared from the leftover portions of the four panels which were cut for desiccator test specimens and also from the fifth panel sampled for each product type. 

Method for preparation of test panels for accelerated and outdoor weathering of bituminous coatings. 

The results of the TMA tests were confirmed by preparing and testing laboratory particleboard panels. Thus, in Table 1 are shown the results of laboratory particleboard panels prepared using a number of different formulations. Of the different formulations tried, at the very long press time of 7.5 min at 195 C, only three are able to satisfy the dry IB (internal bond) strength requirement of >0.35 MPa of the relevant European Norm EN 312 [21] for interior grade panels. These are ... 

Figure 5.34 Infusion chromatograms covering the LC/MS assay time (2.5 minutes), obtained using the post-column infusion method shown in Figure 5.33, comparing the ability of different sample preparation methods to remove endogenous sample matrix components that interfere with the ionization of phenacetin. Panels (a) - (f) show the variation with time of the MS signed specific for the infused standard (phenacitin) following on-column injection of 10 p,L of a blank plasma sample prepared by one of the tested sample preparation methods, (a) Protein precipitation, (b) Oasis SPE. (c) Methyl-tertbutyl ether (MTBE) hquid-liquid extraction, (d) Empore C2 disk SPE. (e) Empore C8 disk SPE. (f) Empore Cl 8 disk SPE. Reproduced from Bonfigho, Rapid Commun. Mass Spectrom. 13,1175 (1999), with permission of John Wiley Sons, Ltd.

Panels of varying total thicknesses, reinforcement types, and foam densities were evaluated for impact resistance using the test methods described above (Section 17.2.4). Test panels were prepared by laying-up... 

Panels were prepared using an airless spray in accordance with the manufacturer s instructions. The manufacturer s specification recommended the product for applications involving immersion in well fluids up to 150 C. The product was tested at 150 °C in well fluids supplied by Amerada Hess from the Scott Field (North Sea). Permeation and corrosion occurred both in the gas and water phases of the test panel after only 3 days continuous service. Further testing in water only confirmed rapid breakdown at 100 C after 1 week s immersion. 

ISO 20182 2005 Refractory test-piece preparation - gunning refractory panels by pneumatic-nozzle mixing-type guns... 

As part of a project testing surface preparation methods for old, rusted steel, Allen [13] examined salt contamination levels before and after treating the panels. Hydrojetting was found to be the most effective method for removing salt, as can be seen in Table 4.3. 

ASTM D 1669 [416] Standard Practice for Preparation of Test Panels for Accelerated and Outdoor Weathering of Bituminous Coatings... 

Static coefficient of ffiction of polish-coated flooring surface is measured by the James machine. The method measures coefficient of friction between test surface (e.g., shoe soles or heel materials) and walkway surface. Floor surfaces, which have static coefficient of friction of less than 0.5, are non-hazardous. Static coefficient is obtained from the recording chart at the point the recorded curve changes to a vertical line. The method of preparation of test panels is described in the separate standard. The James machine is calibrated by the use of a standard leather and board according to the procedure described in a separate standard. ... 

---