are high-molecular-weight hydrocarbon components of asphalt and heavy residual stocks (see bottoms) that are not soluble in n-pentane as described in ASTM-D-3279 Standard Test for n-Heptane Insolubles. This method is applicable to all solid and semi-solid petroleum asphalts containing little or no mineral matter, to gas oils, to heavy fuel oils, and to crude petroleum that has been topped to a cut-point of 650°F (343°C) or higher.