Primer application tests

Figure 10.8 Scanned image of the surface of two alloy panels showing adhesion failure caused by the omission of O2 plasma treatment of the substrate prior to plasma film deposition and application of the primer (Deft 44-GN-72 MIL-P-85582 Type I Waterbased Chromated Control Primer), a) Panel after Skydrol LD4 fluid resistance test, which had the O2 plasma treatment prior to film deposition and primer application, b) Panel after scribed wet (24-h immersion in tap water) tape test, which had not been treated with the O2 plasma treatment prior to film deposition and primer application.

Table 32.4 displays the adhesion test results for different spray primers applied to T/F plasma-treated bare 7075-T6 alloys. The results demonstrate that this special plasma polymer coating gave rise to excellent water-insensitive adhesion of all three spray primers used in this study Turco solution could not delaminate any of the primers over a period of 24h. In addition, up to 6 days aging of T/F plasma coatings in air prior to primer application did not degrade the excellent adhesion performance of the systems. 

Primer Air exposure time of T/F before primer application Dry Tape Test Rating After boiled in H2O for 1, 2, 4, 6, 8h Delamination time in Turco solution (h)... 

Vacuum lamination of terrestrial photovoltaic modules is a new production process requiring special equipment and a significant material development effort. Equipment design studies resulted in improved control and lower costs when using a double-chamber vacuum laminator. Application testing of new materials and primers showed the feasibility of two different back sheet materials, one encapsulant, two new primers for polymers and one primer for metals. 

Sensitivity testing of primers (Refs 3 IS) is conducted with the primers inserted into the specified cartridge case in which they are to be used. The primer is inserted into the primer pocket of the cartridge case so that.the surface of the primer cup, when measured from the center of the primer, is within the tolerance specified on the applicable cartridge drawing. The test is performed in accordance with the complete run-down method described in TECP 700-700, Volume III. AMCR 717-505, Volumes 3 and 5 or AMSMU-P-715-501 FA1, as applicable... 

There is a need for an accurate assessment of the mechanism of cathodic debonding of thick adherends. This would contribute to better control over the selection of formulations resistant to attack. One of the objectives of this work was to develop an accelerated screening test. The screening test was used to evaluate the relative performance profiles of a number of commercial adhesives which were recommended for marine applications. It is hoped that a screening test such as this one could be used to isolate measurable primer properties which can be related to the long term prospectus of the primer, and the variability of this prospectus under permutation of substrate type or additives. 

To further understand the action of the hydroxide ions on the primer properties, weight gain tests were undertaken on various, commercially available adhesives. We attempted to prepare neat samples of ten types of adhesive agents (ie top coats and primers) which had been recommended by the manufacturers as suitable for marine applications. The neat samples were prepared with the use of a commercial adjustable wet film applicator supplied by the Paul Gardner Company. This applicator will lay films up to 0.25inches... 

Output tests for detonator type components are generally based on an attempt to measure the brisance or the peak pressure of the shock wave. The common tests for detonators are practically all applicable to each of the three main varieties, namely stab, electric and flash detonators. Following are brief descriptions of output test for detonators and primers ... 

The input characteristics of relays are difficult to characterize in terms that are significant indications of performance under usual conditions. These items are usually initiated by the spit of a primer, the heat from a delay column, or other action of previous expl elements. The exact mechanism of initiation varies with the application. In some cases, the flame may ignite the expl in others, either the impact or heat of solid particles or a shock wave may play important roles. No useful, quant results have been obtained with gap tests to det sensitivity of the items... 

The uses of IR spectra in identification, classification and mechanistic studies have been well documented. Tests for the identification of plastics utilized in Naval ordnance weaponry are discussed in Ref 21. Correlations between polymeric structure and ablative properties using IR spectroscopy have been obtained by monitoring changes in functional group absorption,properties.(Ref 12). The application of IR spectroscopy to the detection of more than 40 of the most common constituents of primers, tracers, igniters, incendiaries,... 

Primer extension assays are very sensitive for mutation detection and may be advantageous for large-scale testing with some modifications to the basic protocol. Primer extension assays have been designed to use fluorescent dye labeled nucleotides to eliminate the need for radioactivity and may also be adaptable to use on solid supports (22). For molecular diagnostics purposes, there are also commercially available kits and protocols for diagnostic applications (23). 

Several techniques have been utilized for the detection of firearms discharge residue on the hands of an individual who has recently handled or discharged a weapon. Testing for the presence of nitrates proved unreliable and was discarded. Colorimetric tests for barium and antimony from primer composition were found to lack sufficient sensitivity for general application. 

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