【国外标准】 Standard Test Method for Wood Preservatives by Laboratory Soil-Block Cultures (Withdrawn 2016)

This test method is useful in the development of new wood preservatives and preservative systems by evaluating the minimum preservative retention to prevent decay under laboratory conditions. The results are used to facilitate target retentions in subsequent tests for effectiveness against termites (see Test Method D 3345) and in field stakes (see Test Method D 1758). The sections on Treatment and Preservative Permanence are referenced by other ASTM standards. The test method assumes that the test blocks exposed to certain conditions after treatment will achieve equilibrium, and will return to the same equilibrium after exposure to fungi. This assumption may lead to weight loss that is not due to decay. The test uses live cultures of fungal organisms that require careful colonization, storage, and feeding to remain viable strains.1.1 This test method covers determination of the minimum amount of preservative that prevents decay of selected species of wood by selected fungi under optimum laboratory conditions. 1.2 The requirements for preparation of the material for testing and the test procedure appear in the following order: Section TitleSection Summary of Test Method3 4 Apparatus5 Reagents6 Wood and Test Blocks7 Test Fungi8 Culture Media9 Preparation of Test Cultures10 Preparation and Impregnation of Test Blocks11 Conditioning Treated Blocks12 Preservative Permanence13 Stabilization of Treated Test Blocks and Placement in Culture Bottles14 Incubation and Duration of Test15 Handling Test Blocks After Exposure to Test Fungi16 Calculation of Weight Losses17 Evaluation of Test Results18 Refining the Threshold19 Report20 Precision and Bias21 Keywords22 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.