AS NZS 1605.4:2018 pdf free

AS NZS 1605.4:2018 pdf free.Methods for sampling and analysing timber preservatives and preservative – treated timber
A sample of preservative taken in accordance with AS/NZS 1605.1 shall be heated to between 40°C and 60°C to allow foreign matter (bark, chips and similar) to be screened off.The screened sample shall be heated to 40°C，thoroughly stirred and filtered through a .Whatman No. 41 filter paper or equivalent before drawing off sufficient for the required analysis.
A sample of preservative taken in accordance with AS/NZS 1605.1 shall be thoroughly stirred before filtering enough solution for the required analysis through a Whatman No. 4 1 filter paper or equivalent filter at ambient temperature.
A creosote sample taken in accordance with AS/NZS 1605.1 shall be placed in a clean, dry,airtight container allowing about 5% ullage. When sampling, the creosote shall be examined for the presence of separated undissolved matter, particularly water and crystalline solids,or sludge, the presence or absence of which shall be reported. If the creosote contains crystalline solids and has been sampled after heating and mixing, this shall be reported.
Care shall be taken at all times to avoid the risk of contaminating the contents in any way.The sample shall be thoroughly mixed immediately before any portion is withdrawn for testing. If there are any deposits (such as crystalline substances) present, the container shall be warmed on a water bath or by other suitable means just sufficiently to dissolve them, and portions for test shall then be taken from the warmed, mixed sample. A naked flame or other source of intense heat shall not be used to warm the sample.
The analytical methods given in this Standard are intended as referee methods for the determination of timber preservative retentions. Alternative methods should be compared with methods presented in this Standard before being routinely used, provided that they are of comparable accuracy, e.g. CCA treated timber may be analysed by AAS, XRF, or ICP methods, and boron treated timber by alternative water extracted titration method.AS NZS 1605.4 pdf free download.