*SG identifies specific gravity (dimensionless)
*TB identifies the average normal boiling point (deg C | deg F)
*MW identifies the molecular weight (gm/gmol)
*AC identifies the acentric factor (dimensionless)
*PCRIT identifies the critical pressure (atm)
*VCRIT identifies the critical volume (m3/k-mol)
*TCRIT identifies the critical temperature (deg K)
*ZCRIT identifies the critical compressibility factor (dimensionless)
*PCHOR identifies the parachor (dimensionless)
*HCFLAG identifies whether the user component is a hydrocarbon component (see below)