San Mateo has asphalt and asphalt products for sale. San Mateo may also have manufacturers for the same. Asphalt, also known as bitumen, in dark or black in colour, sticky and highly viscous. This is found in crude petroleum, as well as natural deposits. Asphalt and asphalt products are mainly used in road construction, as a part of asphalt concrete. The material acts as a binder. Specifications for the strength and type of binder may vary with the intended use. These products may be used not only in road construction, but also for pavement construction, and sometimes also for roofing and flooring applications. The binders may have chemical compositions that vary. Binders of various types may be combined in a mixture for the usage. Some of the different types of alphalt and its products in modern usage include rolled asphalt concrete, mastic asphalt, asphalt emulsion and coatings for sound insulation.