Accuracy weighing

Solution Table 13.1 shows results calculated using Equation (13.4). The stoichiometric requirement for a binary polycondensation is very demanding. High-molecular-weight pol5Tner, say li > 100, requires a weighing accuracy that is difficult to achieve in a flow system. 

Uncertainty of mass loss measurement. The standard method of the neutral salt spray test does not indicate the mass of RS. Mass loss was found as a difference between the RS prepared for the corrosion test and the RS after the corrosion test and corrosion product stripping as well as protective coating removal from the RS (Table 1). Such a mass loss determination is based on three components (1) mass loss determination by weighing (accuracy 0.5 mg and standard deviation 0.3 mg) before the neutral salt spray test and after it, (2) determination of difference and (3) cor-... 

Novatec developed accurate, sequential metering of up to four materials combined with blending. Figure 3.16 shows the principle of design. The dual load cell under the hopper assures weighing accuracy. Materials are delivered through accurate vibratory... 

If care is taken, data obtained using this procedure will be as accurate as the concentration measurement or weighing accuracy achieved. 

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