AS NZS 1605.2:2018 pdf free
AS NZS 1605.2:2018 pdf free.Methods for sampling and analysing timber preservatives and preservative-treated timber
For sawn and round timber, where the distribution is not considered to be continuous over the penetration zone for a given hazard, or for veneers treated prior to gluing where there is no evidence of preservative penetration in the penetration zone, the sample will be deemed to have failed the penetration requirements of the AS/NZS 1604 series, NZS 3640 or the relevant Standard. Chemical tests for retention compliance with the AS/NZS 1604 series, NZS 3640 or the relevant Standard need not be carried out.
Preservative penetration tests will only indicate the location of one or more of the preservative components. No inference can be made as to whether or not the test piece passes the retention requirements of the AS/NZS 1604 series, NZS 3640 or the relevant Standard.
All reagents shall be of analytical reagent quality. The water used for preparing the reagents shall be distilled. The following reagents shall be used:
(a) Stock solutionA Dissolve 4.0 g cupric acetate monohydrate in 100 mL water.Liquefy 0.5 g non-ionic surfactant (polyalkyleneglycerol ether MW approximately 2500) with heat if necessary, then stir into the cupric acetate solution and keep stirring until the mixture clears.
(b) Stock solution B Dissolve 0.4 g silver acetate in 100 mL water.
(c) 99% isopropyl alcohol.
Immediately prior to use, prepare a test solution by mixing together, in order, equal volumes of stock solution A, stock solution B, distilled water and 99% isopropyl alcohol.
The procedure shall be as follows: Spray, brush or flow test solution over a freshly prepared end- grain surface of a test piece.
Use sufficient test solution to wet the surface and observe the rapid formation of red copper pentachlorophenate.
NOTE: Excessively dark treatments tend to obscure the colour and may make interpretation difficult.
Spray the test solution over a freshly prepared end-grain surface of the test piece. A deep blue to blue-black colour indicates the presence of copper. With some species, it is necessary to use a hand lens to examine the tested surface in order to distinguish a satisfactory result.AS NZS 1605.2 pdf free download.
