IB is the best single measure of the quality of manufacture because it indicates
the strength of bonds between strands. The IB values should be discussed in reference to
the resin content because it strongly depends on the amount of resin applied. The results
showed that rubberwood OSB bonded with 5 % pMDI resin satisfied the JIS
requirement of 0.3 MPa. Internal bond strength (IB) of boards that shown in Figure 3
range from 0.8 to 1.4 MPa, and no significant difference was found between the boardtypes
tested.