Continuous-oil-furnace blacks have dominated the tire-black portion of the carbon black spectrum while the large particle blacks have been produced by the older gas-furnace and thermal processes. New technology has led to the extension of the oil-furnace-black process to include the Thermal black portion of the spectrum. Amenability to control of structure, particle size, and extractables are important features of the process which produces new carbon blacks called LPF for Large Particle Furnace blacks. These new blacks are in the 100–350 nanometer particle size span and can be produced in a range of Dibutyl Phthalate Absorption numbers (ASTM) from about 25 to 120. LPF blacks appear to be similar to existing large particle types, based on general physical properties. However, detailed examination of LPF black morphology with the electron microscope shows unique differences in microstructure. Compared directly in compounds, the new blacks are often more reinforcing than existing counterparts, yielding higher modulus and tensile strength. Substitution of some LPF blacks for Thermal types in mechanical rubber goods can result in substantial savings in terms of plasticizer oil and curative use. Often LPF types can be used to an advantage by replacing blends comprising Thermal types and more reinforcing blacks.