IS 5966:1993 is the Indian Standard (BIS) for non-coniferous timber in converted form for general purposes. This standard specifies the requirements for non-coniferous (hardwood) timber that has been sawn or converted for general purposes. It covers aspects like suitable timber species, moisture content requirements for different climatic zones, permissible defects, grading, and dimensional tolerances.
Non-coniferous timber in converted form for general purposes
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Grading System Basis | Defect-based: Grades (I, II, III) determined by limits on defects across the piece. | Yield-based: Grades (FAS, No. 1 Common) determined by percentage of clear wood in cuttings. | NHLA Rules |
| Moisture Content Specification | Defined by 4 climatic zones in India (e.g., Zone II: 12-15% avg). | Generally agreed upon; or specified for end-use (e.g., 6-8% for interior joinery). | NHLA Rules / General Practice |
| Tolerance on Thickness (up to 50 mm) | -1.0 mm, +3.0 mm | -1.0 mm, +1.0 mm (for tolerance class 1) | BS EN 1313-1:1997 |
| Grade Naming Convention | Grade I, Grade II, Grade III | Prime Grade, Select Grade, Standard Grade, etc. | Malaysian Grading Rules (MGR) |
| End Splits Limit (Grade I) | Shall not exceed 100 mm in length in the aggregate at each end. | Prime Grade: Must be free of end splits. | Malaysian Grading Rules (MGR) |
| Measurement of Knots | Mean of the maximum and minimum diameters of the knot. | Defined by the average of the greatest and least dimension, with specific rules for different knot types (Referenced in EN 1310). | BS EN 1313-1:1997 |