Asphalt Infrared Heaters

infrared heaters
(Infrared heater) A source of heat-producing wavelengths, longer than visible light, which do not heat the air through which they pass, but only those objects in the line of sight.
(Infrared heater) An infrared heater is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation. Depending on the temperature of the emitting body, the wavelength of the infrared radiation ranges from 780 nm to 1 mm.
(Infrared Heater) An infrared or radiant furnace is one that uses infrared lamps, electric heating elements, flames, or radiant tubes to heat the product.  Although the heaters may also heat the furnace gasses, the primary heat source is radiant heating.  See Infrared Heaters below.

asphalt
mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing
A mixture of dark bituminous pitch with sand or gravel, used for surfacing roads, flooring, roofing, etc
The pitch used in this mixture, sometimes found in natural deposits but usually made by the distillation of crude oil
cover with tar or asphalt; "asphalt the driveway"
a dark bituminous substance found in natural beds and as residue from petroleum distillation; consists mainly of hydrocarbons