Similar International Standards
EN 807:2013CEN (European Committee for Standardization), Europe
MediumCurrent
Wood preservatives - Determination of the toxic effectiveness against soft rotting micro-fungi and other soil inhabiting micro-organisms
Tests preservative efficacy against soft rot using an unsterilized soil bed, a key decay type in cooling towers.
EN 84:1997CEN (European Committee for Standardization), Europe
MediumCurrent
Wood preservatives - Accelerated ageing of treated wood prior to biological testing - Leaching procedure
Specifies a leaching pre-treatment, which is an integrated part of the IS 6497 test procedure.
ASTM D1413-07(2021)ASTM International, USA
LowCurrent
Standard Test Method for Wood Preservatives by Laboratory Soil-Block Cultures
A fundamental lab method for preservative efficacy, but uses pure fungal cultures and soil contact, not a simulated water-spray environment.
ASTM D2017-05(2021)ASTM International, USA
LowCurrent
Standard Test Method for Accelerated Laboratory Test of Natural Decay Resistance of Woods
Covers the evaluation of natural durability, but uses a standard soil-block method rather than a cooling tower simulation.
Key Differences
≠IS 6497 uses a unique custom-built apparatus to simulate the cooling tower environment with continuous hot water spray, integrating decay and leaching. International standards typically separate leaching (e.g., EN 84) from the biological test (e.g., EN 807, ASTM D1413), which is conducted in soil beds or on agar.
≠The Indian standard uses unsterilized, non-standardized garden soil as a source of mixed micro-flora. In contrast, standards like ASTM D1413 mandate the use of specific, pure strains of wood-destroying fungi, while EN 807 uses unsterilized soil with specified properties (pH, water holding capacity).
≠The test temperature in IS 6497 is elevated (40 ± 2 °C) to simulate cooling tower conditions. Most international lab decay tests, such as ASTM D1413 and EN 807, are conducted at a lower, near-optimal temperature for fungal growth (around 27 °C).
≠IS 6497 is an integrated test method for a specific end-use application (cooling towers). The international approach is more modular, where results from separate tests (leaching, soft rot, brown rot) are combined to assess suitability for a given Use Class or Hazard Class.
Key Similarities
≈The primary criterion for evaluating durability and preservative efficacy in all compared standards is the percentage of mass loss of the wood specimens after the test period.
≈All methods require the inclusion of untreated, non-durable wood specimens (e.g., Semul in IS 6497, Pine/Beech sapwood in EN standards) as 'feeder' or 'control' blocks to verify the virulence of the biological attack during the test.
≈All standards specify rigorous procedures for the initial and final conditioning and weighing of test specimens to ensure accurate and reproducible calculation of mass loss, typically involving oven-drying to a constant weight.
≈The overall objective is shared: to provide a laboratory-based, accelerated method to compare the relative performance of different wood species or preservative treatments against microbiological degradation.