Table 6. --Summary of results obtained from fenceposts cut from dead lodgepole pine 

 trees and treated with preservatives by three different pressure testing 

 schedules 



Average 







Number of 



Average depth 



Averag 



le depth 



preservative 



Treating schedule 





posts 



of s 



apwood 



of penetration 



retention 









Inches 



cm 



Inches 



cm 



Lb/ft^ 



kg/m^ 



30 min vacuum and 15 



min 

















pressure, 100 psi 





11 



0.85 



2.16 



0.84 



2. 13 



0.517 



8.28 



30 min vacuum and 30 



min 

















pressure, 100 psi 





12 



. 89 



2. 26 



.89 



2.26 



.576 



9.23 



30 min vacuum and 45 



min 

















pressure, 100 psi 





16 



.88 



2.24 



.86 



2.18 



.701 



11.23 



Average 







0.87 



2.21 



0.86 



2. 18 



0.611 



9. 79 



Preservative retention assays were performed on samples cut from the disks for 

 each of the three treated groups. Individual samples were combined for each group and 

 the group sample was assayed for copper, chromium, and arsenic by AWPA Method A-9 (X- 

 ray emission spectroscopy). All samples exceeded the minimum retention of 0.4 lb per 

 ft^ (6.41 kg/m^) of copper, chrome, and arsenic as required by AWPA C-5 for lodgepole 

 pine fenceposts. 



PRESERVATIVE TREATMENT OF POLES MADE FROM 

 DEAD LODGEPOLE PINE TREES 



t 



Procedure 



Thirty logs from dead lodgepole pine trees were selected in a sawmill storage 

 yard for use in this investigation. The logs, 20, 25, or 30 ft long (6.1, 7.6, or 

 9.1 m) were suitable for poles in classes 5, 6, or 7. Ten of the poles were 20 ft 

 long (6.1 m), 18 were 25 ft long (7.6 m) , and 2 were 30 ft long (9.1 m) . After 

 selection, the poles were delivered to a commercial pole treating plant for processing 

 and treatment. 



Although the poles had very little bark, they were machine-peeled, numbered, and 

 stored until time for treatment. During storage, the circumference at the top, butt, 

 and groundline of each pole was measured and recorded and, in addition, a 1- or 2-inch 

 (2.5- or 5.1-cm) thick disk was cut from both ends of the poles (fig. 3). These 

 disks, numbered as to pole of origin, were used in the preparation of percent moisture 

 content and specific gravity test specimens in the same manner described earlier for 

 the fencepost disks. 



8 



