Stability results evaluation

We can also determine the relative stability of cis- and trans-l, 3-butadiene by evaluating the stabilization resulting from the union of allyl and methyl radical fragments in a cis and trans geometry. The dissection of 1,3-butadiene is shown below. It is predicted that the trans isomer will be more stable. 

The manufacture of products, e.g. containers and lids, made from filled foamed PE by gas counter pressure injection moulding was studied with special reference to the effect of production conditions on dimensional stability. Results obtained are discussed and evaluated. 7 refs. 

If the results to this point indicated a successful method, then storage stability was evaluated. If all requirements of the protocol were met, the method was considered laboratory-validated and appropriate reports were prepared. At various stages of the protocol, we evaluated the probability of success within the budget for each method. If at any time it became apparent that the method study could not be successfully completed within budget, laboratory work was discontinued and a failure report was prepared. 

Storage stability was evaluated by storing photosensitive lithographic printing plates at 38°C and 80% relative humidity for 1 week and then evaluating development properties. These results are provided in Table 1, where the symbol A indicates excellent storage stability, and where storage stability deteriorates in order of the symbols B,... 

Failure to complete registration stability studies Failure to include each marketed product in the stability program Stability data not evaluated as part of the annual product review Stability results do not support expiration dating period Batches evaluated under QA requested studies released before sufficient data were available Stability data do not support proposed changes... 

Thermal stability. Thermal stability was evaluated with the hot tube test at 290°C, Table 3.7. The apparatus and method were described elsewhere (Okhawa and Seto, 1984) and results were presented as the lacquer rating, which rated on a scale of 0 (black) to 10 (colorless and transparent). 2 wt% of micellar carbonate and borate with detergents were dissolved in SAE 50 base oil. As presented in Table 3.7, the borate micelles showed much better thermal stability on a scale of 0 to 10 (sulfonate 6, salicylate 9, and phenate 9 units) than those of the micellar carbonate (sulfonate 5, salicylate 2, and phenate 6 units). In particular, the thermal stability of borate-salicylate and borate-phenate RMs was found to be excellent. 

The results of the computer evaluation indicate that at best there is only a weak correlation between the measured stability results and the measured properties of the carriers (see Table II). Taking the properties one at a time, we find insignificant correlation with the three months malathion losses. The correlation coefficients, which should be close to 1.0 for good correlation, show that there is not much correlation with the individual properties. The only exception was ion exchange, and here there are so few data points that any conclusion is questionable. We also... 

The properties that we evaluated predicted stability results only weakly. Perhaps under special conditions, such as specific carrier groups, such properties could give the desired correlations. However, for general carrier selection the correlations appear too weak, and therefore we should rely only on actual carrier stability tests. Reliance on correlations of these properties could lead to elimination of useful carriers or to selection of marginal ones. 

In addition a thermogravimetric analysis of these polymers was carried out. Their thermal stability was evaluated in the following sequence of the onset decomposition temperature P(cgTFSI) (T = 389°C) > P(dgTFSI) (T = 382°C) > P(egTFSI) T=3Sl°C) > P(bgTFSI) (T=371°C). From these results the IL-type polymer brushes were determined to be thermally stable up to around 400°C. This is an excellent property for application to electrochemical devices. 

Regardless of the official specifications for soybean oil and its products, the ultimate proof of the pudding is in the eating that is, sensory evaluation of the odors and flavors of soybean oil and its products is the ultimate method to assess oil quality and stability. Sensory evaluation cannot be replaced fully by any chemical or instrumental analysis, although some methods can correlate fairly well with sensory results. Sensory evaluation of oils usually is done by a panel of experts or a trained panel, and often the method recommended by the American Oil Chemists Society (300) is used. During the evaluation, the panel is asked to score the overall flavor quality, as well as the intensity of many individual off-fiavors. Although chemical and physical tests are more reproducible and less time consuming than sensory evaluations, oxidative rancidity and off-flavor evaluation of soybean oils are best done by sensory tests. Correlations established between sensory evaluation scores and... 

Results from the Stabilization Technologies Evaluated by the SITE Program... 

The stability was evaluated, following the procedure described in section 4.3. On the basis of the results (Table 4.5), it was concluded that no instability of the material could be demonstrated. 

Pre-study validation defines that the method produces reliable results. During pre-study validation, fundamental parameters such as selectivity, assay calibration, accuracy, precision, linearity, and stability are evaluated. 

If the hole is enlarged, it becomes weak and difficult to stabilize, resulting in problems such as low annular velocities, poor hole cleaning, solids loading and poor formation evaluation. 

Assessment of stability and reinjection reproducibilities six replicates of QC samples (30,500, and 3760 ng/mL) are evaluated after each of the following conditions (1) three cycles of freeze-thaw (2) room temperature for 24 h and/or (3) extracted samples in autosampler for 52 h. Table 7.3 shows the stability results. 

Sawai et al. studied the mechanical properties of a stereocomplex PLA film prepared by casting from a solution of an equimolar blend of PLLA and PDLA [35]. The film was uniaxially drawn by solid-state coextrusion and characterized by DMA. The optimum draw temperature resulting in the highest draw and mechanical properties was 200° C. The maximum achieved tensile modulus and strength, for the samples with an extrusion draw ratio of 16 and prepared by solid-state coextrusion of a highly crystalline stereocomplex film, were 9500 and 410 MPa, respectively. Furthermore, the PLA stereocomplex films with an extrusion draw ratio of 16 exhibited excellent thermomechanical stability as evaluated by the E measured as a function of temperature. The reported E values at room temperature, 100 and 200°C, were 9500, 7000, and 3000 MPa, respectively [35]. Equimolar amounts of PLLA and PDLA stereocomplex are therefore characterized, upon orientation, by the most relevant me-... 

If the initial feasibility evaluation is successful, it is reasonable to commit additional materials for a spray-drying trial. A laboratory dryer at least 500 mm in diameter is recommended for such tests. Bench-scale spray dryers are available but are limited in their ability to provide adequate atomization or sufficient process air flow for the successful production of dried particles. The laboratory unit, however, eom-bined with very fine atomization (two-fluid or rotary) will often produce aceeptable product for further testing. A series of tests can be performed at different inlet-outlet temperature combinations using small quantities of material and these samples ean be tested for chemieal stability to evaluate thermal effects from process air contact. The relationship between outlet temperature and final product moisture can also be established for this seale. While samples produced in a laboratory dryer are suitable for evaluating the effeet of spray drying on the product, they are not suitable for use in downstream proeessing because the fine particle distribution produced as a result of the small drying chamber dimensions may not be representative of the final spray-dried produet. 

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