Solvent wipe test

Simple Solvent Wipe Test. The simplest test method to determine the extent of cure is to rub a cotton swab that has been soaked in a suitable solvent (e.g., methyl ethyl ketone) against the surface of the cured adhesive. If the adhesive softens, it is very far from a fully cured condition, and the degree of softness is a very gross indication of the degree of cure. 

The test method used was a solvent wipe test where specified pressures and solvent concentrations are applied to each coated sample. Data generated was number of seconds to pinhole distortion which relates to amount of cure. Figure 4 elucidates the results. 

In order to check the paintability of parts molded with Q2-7119, test panels molded with and without silicone fluid were post-cured, solvent wiped with toluene, primed with PPG Durethane 600 Primer and then top coated with Durethane 300 blue metallic flake or white. Painted samples were exposed for 2 years in Florida Direct Black Box 5° South and then evaluated for appearance and adhesion. Results of these tests showed no difference between control and IMR-containing panels. Paint adhesion was excellent. 

The method used for testing durability of adhesive bonds was developed at 3M by W.D. Sell (16) and is called "sustained load stress durability". The metal substrates were 2024T-3 clad or bare aluminum alloy, 5052T-4 bare aluminum alloy or 1010 cold rolled steel. The surface preparation for the aluminum alloys was either the "optimized" FPL-etch" or the H PO -anodization process (12). The steel was solvent wiped. If a primer was used, it was cured before application of the adhesive. Film... 

Substrate was 2024 T3 bare aluminum, solvent-wiped, Scotch-Brite -abraded, and solvent-wiped bonds were aged three days at RT, then half were aged an additional seven days at 90°C. These OLS bonds were tested at 23°C according to ASTM D1002-72. 

Carbon fiber-epoxy composites (A) Solvent wipe (MEK, toluene, trichloroethylene, etc.) (B) Use peel ply during initial curing. (C) See Ref. 15 for the effect of abrasion procedures. See also Refs. 16 and 17. (A) Lightly abrade with medium-grit emeiy paper. Avoid exposing the reinforcing fibers. (A) Wipe with solvent. Check surface by water break test. Retreat, if necessaiy. 

The usual method for determining the presence of removable contamination is the wipe test. A small disk of filter paper about 3 centimeters in diameter, either dry or moistened with an appropriate solvent, is wiped in a zigzag pattern over a predefined area of about 100 square centimeters, taking care not to touch the wiped surface with the bare hand. Wetting the disk may enhance its capacity to pick up contamination. The disks are coded to correspond to the specific sections of the work areas of the laboratory that have been wipe-... 

Wipe sampling involves swiping a dry or wet (use of a solvent or other liquid besides water in eommonplaee) eloth, glass fiber filter paper, or swab over the surfaee of a potentially eontaminated objeet and performing a laboratory analysis. Both the inner and outer surfaees of PPE should be tested to eheek for permeation. Skin ean also be tested using this wipe sampling [1]. 

The wrapping is removed at the end of the 24-h exposure period. The test substance skin site is wiped to remove any test substance still remaining. When colored test substances (such as dyes) are used, it may be necessary to wash the test substance from the test site with an appropriate solvent or vehicle (one that is suitable for the substance being tested). This is done to facilitate accurate evaluation for skin irritation. 

Thoroughly wiping the horizontal surface of the ATR crystal with low-lint paper has been the method of choice for cleaning without the use of any solvent. However, to ensure the complete removal of a test sample the analyst should also apply the subsequent test portion and clean the crystal once again. Additionally, the analyst could make an infrared measurement after cleaning the crystal the absence of a spectrum would confirm that the crystal is clean. 

It will be apparent therefore that the presence of one or more additives in a composition is not necessarily deleterious. (It depends on the additives, and their properties.) In a comparison, films containing different additives that showed markedly different responses to ink were wiped with a solvent and subsequently the adhesion of print was tested the results obtained in these instances were approximately the same, suggesting that even interfering substances can be removed if need be. However, with some additives, should time be allowed to elapse between treatment and printing, it might be necessary to carry out some secondary preparation of the film. 

After fission of uranium 235, the radionuchdes produced in the spent fuel have cesium, strontium, iodine, and other radionuclides of very long half-lives that can be a danger. The other radio wastes include contaminated filters, wiping rags, solvents, protective clothes, hand tools, instruments and instrument parts, vials, needles, test tubes, and animal carcasses. Precautionary and preventive measures include ... 

Remove the stopper of the third 20 x 150-min test tube containing NO, swing the test tube (mouth forward) through the air, and replace the stopper. Place the test tube in the l-hexanol slush bath contained in the Dewar flask, and allow the test tube to cool for a few minutes. Remove the test tube, wipe it free of frost and of solvent with a tissue, and note carefully its contents. Describe in TABLE 38.IH what you observe on the sides of the test tube. Any blue liquid is N2O3. 

Corrosion tests should also be carried out because DMF is a good solvent for halide salts. For both exotherms and corrosion a wiped film evaporator has advantages since in evaporation exposure time is short, solvent inventory is small and the amount of exotic materials of construction are also minimized. 

Variability in the MFI value and proper interpretation of test data have been the subject of discussion in the past [7,8]. Table 4.1, taken from Hanson [9] lists the possible sources of errors resulting in the variability of MFI tests. Precise measurement of MFI calls for very strict control of all possible variables, and the test, although simple, must be performed with considerable care. The first and foremost care that should be taken is to ensure that the banel, piston, and nozzle are scrupulously clean, by treatment with hot solvents and wiping with lint-free nonabrasive cloth. The barrel should be maintained at the test temperature for 15 min and then charged with the test sample weighing between 4 and 8 g within a period not exceeding 1 min. The unloaded piston should be inserted... 

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