Research on LVL in the 1970s was aimed at defining
the effects of processing variables for veneer up to 12.7 mm
(1/2 in.) thick. Since the 1990s, production of LVL uses
veneers 3.2 to 2.5 mm (1/8 to 1/10 in.) thick, which are hot
pressed with phenol-formaldehyde adhesive into lengths
from 2.4 to 18.3 m (8 to 60 ft) or more. Today LVL is commonly
used as the flanges in composite I-joists.