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Petrochemicals | ASTM D3238 Carbon Type Distribution of Petroleum Oils - SVM 4001/Abbemat Application Report

Measure the required parameters and calculate carbon distribution and ring content of oils according to ASTM D3238 in one go within minutes.

Why determine carbon type distribution?

The carbon type distribution serves to express the gross composition of the heavier fractions of petroleum into paraffinic, naphthenic, and aromatic components. It is one of the most important parameters for the qualification of base oils, lube oils, process oils, or plasticizer because it directly correlates to critical product performance properties.

According to the standard ASTM D3238, the carbon distribution and ring content of olefin-free petroleum oils is calculated from measurements of refractive index, density and molecular weight (n-d-M method).

The mean molecular weight can be calculated following ASTM D2502 from viscosity measurements at 37.78 °C and 98.89 °C (100 °F and 210 °F).

So the following basic parameters are required:

  • kinematic viscosity at 37.78 °C and 98.89 °C (obtained from SVM 4001)
  • refractive index at 20 °C (obtained from the refractometer)
  • density at 20 °C (calculated from the measured density values by the SVM software)

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