Similar International Standards
EN 275:2018CEN (European Committee for Standardization), Europe
HighCurrent
Wood preservatives - Determination of the protective effectiveness against marine borers
Specifies a method for determining the effectiveness of wood preservatives against marine borers by exposing treated wood to the sea.
ASTM D2481-12(2018)ASTM International, USA
HighCurrent
Standard Test Method for Accelerated Evaluation of Wood Preservatives for Marine Services by Means of Small Size Specimens
Provides an accelerated method using small specimens to evaluate preservative efficacy against marine borers.
AWPA E5-19American Wood Protection Association (AWPA), USA
HighCurrent
Standard Test Method for Determining the Resistance of Treated Wood to Marine Borers
Details a procedure for evaluating the relative resistance of treated wood specimens in a marine environment.
Key Differences
≠IS 6791 specifies a large test specimen size (300x100x25 mm), which is significantly larger than the small, accelerated test specimens in ASTM D2481 (e.g., 19x19x76 mm) and different from EN 275 (250x80x20 mm).
≠The damage rating system in IS 6791 is qualitative and descriptive (Nil, Light, Moderate, Heavy, Destroyed), whereas international standards like AWPA E5 use a quantitative numerical scale (10 to 0) for more precise comparison.
≠International standards such as AWPA E5 mandate the inclusion of specimens treated with a reference preservative (e.g., CCA, creosote) for comparative performance, a requirement not explicitly stated in IS 6791.
≠IS 6791 suggests specific test harbor locations within India (e.g., Mumbai, Cochin), while international standards provide general environmental criteria for site selection (e.g., known borer activity, salinity, temperature).
Key Similarities
≈All standards are based on the fundamental principle of in-situ testing by submerging treated and untreated wood specimens in a natural marine environment.
≈The primary method of exposure is consistent, involving mounting specimens on racks or 'ladders' and placing them in the sea, typically below the mean low tide level.
≈All methodologies require the use of untreated control specimens from a susceptible wood species to confirm that the test site has sufficient and active marine borer populations.
≈The target organisms for evaluation are the same, focusing on attack by shipworms (Teredinidae) and gribble (Limnoriidae), which are the most destructive marine borers globally.