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6903514 
Journal Article 
EFFECTS OF POST-TREATMENT WITH CA AND CCA ON SCREW WITHDRAWAL RESISTANCE OF WOOD BASED COMPOSITES 
Tascioglu, C; Akcay, C; Yalcin, M; Sahin, HI; , 
2014 
1 
Wood Research
ISSN: 1336-4561 
SLOVAK FOREST PRODUCTS RESEARCH INST 
BRATISLAVA 
343-350 
WOS:000337934300013 
The screw withdrawal resistances of three commercially available wood based composites (WBC), medium density fiberboard (MDF), particleboard (PB), and plywood (PW) were investigated after vacuum-impregnated with copper azole (CA) and chromated copper arsenate (CCA). Two different concentrations were used from both preservatives to obtained above-ground and ground contact retention levels. In addition to the untreated control specimens, a set of only water treated control specimens were utilized to differentiate effects of water (carrier) since both preservatives are water based. Screw withdrawal strengths of the treated boards were determined perpendicular to grain direction after fixation and conditioning periods.The experimental results show that post-treatment with water-only significantly reduced screw holding strength of MDF and PB tested in the study. The CA and CCA treatments, however, did not cause any further reductions rather than reductions resulted from water-only treatments. The post-treated plywood, on the other hand, seems to be unaffected by water, CA and CCA treatments at all retention levels tested exhibiting the same level of screw holding strength after the post-treatments. The reductions in screw withdrawal strength need to be taken into account when and if such WBC treated with water-based preservative chemicals.