Impregnated wood

Neoprene-impregnated wood fiber 175 Nouporous recommended for glycol, oil, and gasohue to 175 F. 

The influence of moisture is fundamental, as it is with other forms of corrosion. Long-term contact tests with ponderosa pine, some treated with zinc chloride, in atmospheres at 30, 65 and 95% r.h. showed that at 30 and 65% r.h. plain wire nails were not very severely corroded even in zinc chloride-impregnated wood. At 95% r.h. plain wire nails were severely corroded, though galvanised nails were attacked only by impregnated wood. Brass and aluminium were also attacked to some extent at 95% r.h. Some concurrent outdoor tests at Madison, Wisconsin, showed that the outdoor climate there was somewhat more severe than a 65% r.h. laboratory test. 

Explosions were caused by transportation of metal castings in wooden kegs previously used to store potassium chlorate, impact or friction of the metal causing initiation of the chlorate-impregnated wood. 

Heikkila PR, Hameila M, Pyy L, et al. 1987. Exposure to creosote in the impregnation and handling of impregnated wood. Scand J Work Environ Health 13 431-437. 

The first literature report of a reaction of an isocyanate with wood is that due to Clermont and Bender (1957). In this study, DMF impregnated wood samples 1/8 in thick were suspended above phenylisocyanate liquid in a vessel heated at temperatures from 100 °C to 125 °C for various time intervals. Treated samples were washed with DMF, then water, then acetone, and dried in an oven at 105 °C. ASEs in the range of 60-80 % were reported for these samples. In view of the reactivity of DMF with isocyanates, the lack of an efficient clean-up procedure and the fact that ASE values were calculated from the first water-soak cycle only, this study is of limited value. 

Schneider and Brebner (1985) impregnated wood samples with the organo-silane y-methacryloxypropyltrimethoxysilane (TMPS) (Figure 7.9a) and determined the dimensional stability as a resnlt of this treatment. Wood samples were conditioned to 6-8 % MC before being impregnated with a methanolic solution of the silane. The methanol was allowed to evaporate from the treated samples and they were then submerged in water to... 

Nakagami and Yokota (1983) impregnated wood with a solution containing methacrylic acid, trifluoracetic acid and sulphuric acid, to form a covalent bond with the cell wall polymers. The methacrylic-reacted wood was then impregnated with styrene, or methylmethacrylate, to form cross-links with the reacted cell wall polymers. Improved dimensional stability was obtained, although degradation of the wood was also observed. 

A solution of styrene in methanol to impregnate wood samples, followed by polymerization, was used by Furuno and Goto (1979). Penetration of the monomer into the cell wall was determined by solvent extraction of samples after polymerization. This removed lumen located polymer, whilst leaving the cell wall bound polymer in place. This showed that the concentration of cell wall bound polymer increased in proportion to the monomer content in methanol, up to a maximum of 80% of the monomer in the solvent. No cell wall penetration was observed for treatment with neat monomer. This was also found for bulking of the wood, as determined from external dimensions of the samples. Improvements in ASE were obtained as a result of the presence of cell wall bound polymer. To achieve similar ASE values with lumen located polymer required very high polymer loadings. 

Ohkoshi, M. (2002). FTIR-PAS study of light-induced changes in the surface of acetylated or polyethylene glycol-impregnated wood. Journal of Wood Science, 48(5), 394-401. 

SEALM ASTER Ball Bearing Babbitt, Bronze or Oil-Impregnated Wood scir- Lubricating Bronze Hard Iron... 

Impregnated wood, glass-reinforced polyester or precast concrete are acceptable materials for water basin. 

Ottosen, L., Pedersen, A. and Christensen, I. (2004) Characterization of residues from thermal treatment of CCA impregnated wood. Chemical and electrochemical extraction, Environmental Impacts of Preservative-Treated Wood, Florida Center for Environmental Solutions, Conference, February 8-11 Gainesville, Orlando, FL, pp. 295-311. 

Lundholm, K., Bostrom, D Nordin, A. and Shchukarev, A. (2007) Fate of Cu, Cr, and As during combustion of impregnated wood with and without peat additive. Environmental Science and Technology, 41(18), 6534-40. 

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