INDEX test runs

The standard melt flow index machine is often used for characterising the flow properties of polypropylene and to provide a rough measure of molecular weight. Under the conditions normally employed for polyethylene (2.16 kg load at 190°C) the flow rate is too low for accurate measurement and in practice higher loads, e.g. 10 kg, and/or higher temperatures are used. It has been found that a considerable pressure drop exists in the barrel so that the flow towards the end of a test run is higher than at the beginning. 

The temperature index is the maximum temperature that causes a 50% decay of the studied characteristics in the very long term. It is derived from long-term oven-ageing test runs. The UL Temperature Index depends on ... 

Test run of known spice blends from published literature. The spice blends which contain basil, cinnamon leaf, peppermint, sage and wimergreen as reported by Lawrence and Shu (4) were used to test the effectiveness of the present iheoty. The ratios of individual spice are shown in Table VI, the coded numbers of identified volatile compounds in the spice blends are shown in Table VII Conqxiter output of numerical analyses of compounds shown in Table Vfl are listed in Table VIII, the similarity index of the testing result is 0.959, indicating a high level of confidence. In Table VIII, there are repeated identifications of the same type of spice, e.g., the appearance of basils H3, 19, 24, 26 and 27 doves 1 and 4 and mentha 1 and 12. In fact, the repeated appearance of the same spice indicates the closeness of these spices. It was also confirmed that the similarity index within the same spice listed in Table VIII usually ranged from 1.0 to 0.90 (data not shown). In order to... 

A capillary rheometer (Fig. 6.8) is similar to a melt indexer. The main difference is that instead of by gravity, the piston is driven by a variable speed motor. Also, a load cell in-line with the piston measures ram force in real time. This configuration allows tests to be run at a controlled shear rate, and even to vary the rate over a large range during a single test run. The piston force and the orifice geometry provide the data necessary... 

The catalyst sample is confined to a small cup, into which gas is tangentially added at a high velocity (about 150 m/s). After a test run over a period of an hour, the so-called Davison Index (DI) is determined by measuring the increase in the weight fraction of particles below 20 microns. The increase is determined from both the fraction of elutriated fine material and a particle size analysis of the remaining fraction in the cup. 

A control material with a known index is run concurrently with the material being tested to eliminate effects of test variability. The control material for glass-reinforced composites is usually the base resin. 

Drawdown and build-up surveys are typically performed once a production well has been completed, to establish the reservoir property of permeability (k), the well completion efficiency as denoted by its skin factor (S), and the well productivity index (PI). Unless the routine production tests indicate some unexpected change in the well s productivity, only SBHP surveys may be run, say once a year. A full drawdown and build-up survey would be run to establish the cause of unexplained changes in the well s productivity. 

Corrected stabiltiy index a2h/c + F corrects values at each heating rate to the same basis as if tested at a reference heating rate of 10°C/min. F is the correction factor m — ml log pi regression line and Pi is the heating rate used in any given run. 

Typically a fixed wavelength is selected in the region of maximum absorption and that same wavelength is used for that color every time the test is run. For example, one might select 520nm for Solvent Red Color Index 135 (Si -135) and 540nm for Solvent Red Color Index 52 SR-52). 

Related Calculations. Although the Bond grindability test is run dry, the work index calculated above is for wet grinding. For dry grinding, the work index must be multiplied by a factor of 4/3. 

Relative Melt Index Potential. Melt indices were obtained from polymer samples by the standard test (ASTM D 1238-73) at 190 C using a weight of 2160 grams. However, melt index values are not just affected by activation parameters, but also by reactor conditions, such as the temperature, monomer concentration, and residence time. Therefore for clarity in this report we have normalized melt index values against those of a reference catalyst run under the same reactor conditions. We call the normalized value the relative melt index potential (RMIP) because it is... 

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