Furfural resins.

Large scale commercial production of furfural, an aldehyde obtained from oat hulls and other farm waste, has made it available for synthetic resin manufacture.

Tar-acid furfural resins possess certain outstanding properties, such as great dimensional accuracy, great reaction speed to the infusible solid stage, and unusual strength and toughness. They are available in dark shades only. Printing plates as large as those of metropolitan daily papers are molded from them as are radio tube bases, all sorts of electrical parts, and machined parts requiring great dimensional accuracy. Other uses are in abrasive wheels, varnishes, and adhesives.

Probably the largest domestic maker of furfural resins is the Durite Plastics Division of Stokes and Smith Company, Philadelphia, Pa.