Fig. 2

Relationships between exposure time and mean nail-head pull-through strength (NHPT) at the four sites for a phenol–formaldehyde resin-bonded particleboard (PB), b oriented strand board (OSB) manufactured from aspen, and c methylene diphenyl diisocyanate resin-bonded medium-density fiberboard (MDF). The site no. is described in Table 1. The white, gray, and black colors indicate low-, middle-, and high-temperature sites, respectively, as indicated in Table 1