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EC number: 224-580-1 | CAS number: 4418-26-2
The volume of the test item Vs is calculated by the device using the following equation:
Vs = Vcv + Vrz * ((pch – prh) / (pch – patmh))
Vs = volume of test item
Vcv = volume of the sample chamber
Vrz = volume of the reference chamber
Pch = pressure after expansion
Prh = pressure of the reference chamber before expansion
Patmh = pressuer of the sample chamber before expansion
To calculate the relative density D420 at 20 °C, the measured density of the test item pTI at 20 °C is divided by the density of water pw4 at 4 °C (0.9999750 g/cm³). The relative density at 20 °C D420 is calculated according to the following equation:
D420 = pTI / Pw4
D420: Relative density (without dimension) of the test item measures at a temperature of 20 °C compared to the density of water at 4 °C
pTI: Density of the test item measured at a temperature of 20 °C ± 0.01 °C in g/cm³
pw4: Density of water at 4 °C in g/cm³
Two tests with different amounts of the test item were performed to determine the relative density D420 at a temperature of 20 °C ± 0.01 °C.
Table: Results of the measurement of the density of the test item
Amount of test item [g]
Average sample volume [cm³]
* The pressurizing-expansion cycles are performed until 5 subsequent volume measurements have a relative standard deviation (RSD) of ≤0.2 %.
The mean density of the test item at 20 °C is 1.4988 g/cm³. The relative density D420 is calculated by dividing the density of the test item by the density of water at 4 °C (0.9999750 g/cm³).
Relative density is D420 = 1.499
The substance dehydroacetic acid sodium salt has a relative density of 1.499 at 20 °C (OECD 109, gas comparison pycnometer).
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