Applied Research -  Laboratory Testing -  Chemical
CHEMICAL TESTING ICON

Leachabilty


    Test Methods:
  • AWPA Standard, E10-01, Standard Method of Testing Wood Preservatives by Laboratory Soil-Block Cultures. 11.2 Leaching Procedures for Water-borne Preservatives, 1999.
  • AWPA Standard, E11-97, Standard Method of Determining the leachability of Wood Preservatives, 1999

Leachability testing is a type of accelerated laboratory depletion test. It evaluates the degree of fixation of the preservative under the harshest conditions. Leachability specimens are saturated with distilled water under pressure and kept submerged with weights. The water is changed at specified time intervals for two weeks. The changed water (leachate) may be saved for analysis. After the leaching period is over the specimens are analyzed along with unleached specimens to determine the amount of preservative leached out of the specimens.
LEACHABILITY TESTING

CHEMICAL TESTING ICON

Corrosivity Of Metal In Contact With Treated Wood


Test Method: AWPA, E12-94 -Standard Method Of Determining Corrosion Of Metal In Contact With Treated Wood, 1996. p.318.
With the wide variety and extensive use of metal fasteners in wood construction, determining the effect of preservative chemicals on metal corrosion rates is important. Test metal strips, commonly including SAE 1010 steel, red brass, aluminum alloy, and hot-dipped zinc galvanized steel are sandwiched between treated wood blocks. The assemblies are held together with nylon fasteners under moderately high temperature and high humidity for a specified time period. Then, the corrosion products are cleaned from the metal specimens, and the weight loss due to corrosion is determined. Using a standardized formula, the corrosion rate is expressed in mils per year.
CORROSIVITY OF TREATED WOOD

CHEMICAL TESTING ICON

Corrosivity Of Metal In Treating Solution


Test Method: AWPA Standard, E17-99 -Standard Method For Determining Corrosion Rates Of Metals In Contact With Treating Solutions, 1999, pp.404-405.
This test is relevant to wood preservers who may use the chemicals to treat wood in assessing the potentially damaging corrosive effect on their plant equipment. Test metal alloy coupons, commonly including mild steel, red brass, and phosphorous bronze are suspended in jars of treating solution by strings attached to the jar lids. The assembled test jars are agitated on a platform shaker for 25 days, with the treating solution changed at specified time intervals. After 25 days the corrosion products are cleaned from the metal test coupons, which are then weighed to determine the weight loss due to corrosion. Using a standardized formula, the corrosion rate is expressed in mils per year.
CORROSIVITY IN LIQUID PRESERVATIVES