Efficacy of pressure treating northeastern red spruce with CCA using the pulsation process

The pulsation process was investigated in an attempt to improve treatment of red spruce with chromated copper arsenate (CCA). This work examined the efficacy of five different pulsation schedules, each having a different number of high pressure periods, and peak pressures of 200 and 300 psi (976 and 1,465 kg/m3) to treat wood in the partially air-dried and green (above fiber saturation point) conditions. Treatment runs were evaluated on the basis of weight gain retention and radial and tangential penetration measurements. Our findings were inconsistent with previous works that reported success in obtaining improved preservative penetration in other species of spruce with the pulsation treatment process. The preservative penetration and retention levels were highly variable and none of the treatment schedules produced significant improvement.

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