Asphaltan B is a product of Romonta GmbH, Amsdorf, Germany. It is available in granular form in 25 kg bags. Created specifically for "rolled asphalt", Asphaltan B is a mixture of substances based on Montan wax constituents and higher molecular weight hydrocarbons.

Crude Montan Wax is found in Germany, Eastern Europe and areas of the USA in certain types of lignite or brown coal deposits that have formed over millions of years by the transformation of fossilized sub-tropical vegetation that flourished in the Tertiary Period. Wax which once protected the plant leaves from extremes of climate did not decompose, but instead enriched the coal. Due to its high stability and insolubility in water, the wax has survived over long geological time periods. After mining, the Montan Wax is extracted from the coal by means of a toluene solvent that is distilled from the wax solution and removed with super heated steam. Romonta GmbH has a global market share of 80 per cent in the crude mined wax products sector.

Romonta recommends adding Asphaltan B at 2 to 4 percent by weight. It can be added to the asphalt mixing plant or directly at the binder producer and can also be added to polymer-modified binders. The melting point of Asphaltan B is approximately 210° F. Similar to FT waxes, it acts as an "asphalt flow improver" with associated reduced production temperatures. Romonta does not specify how much the production temperature can be lowered. Like FT waxes, Romonta also reports increased "compactibility" and resistance to rutting.