Similar International Standards
MTE Teak Log Grading RulesMyanma Timber Enterprise (MTE), Myanmar
HighCurrent
Myanma Timber Enterprise Teak Log Grading Rules
Defines grading, measurement, and defect classification specifically for teak logs of Myanmar origin.
Perum Perhutani Teak Log Grading RulesPerum Perhutani, Indonesia
HighCurrent
Rules for Grading Teak Logs (Jati)
Provides grading system for plantation teak logs in Indonesia, focusing on defects and dimensions.
ISO 4476:1988International Organization for Standardization (ISO)
LowWithdrawn
Wood — Coniferous and broadleaved logs — Measurement of features and determination of volume
Overlaps only on the methodology for measuring log dimensions (length, diameter) and calculating volume.
ATIBT General Rules for Tropical LogsInternational Tropical Timber Technical Association (ATIBT)
MediumCurrent
General nomenclature of tropical timber & General rules for grading
Shares principles of log grading based on defects, but is applied to African species, not teak.
Key Differences
≠IS 4895 uses a simple three-tier system (Grade I, II, III), whereas MTE (Myanmar) uses a more complex system distinguishing between veneer and sawing qualities with multiple sub-grades (e.g., 4-Star Veneer, SG-1, SG-2).
≠IS 4895 uses a quarter-girth formula [Volume = (G²/16) * L] for volume calculation, which is an approximation. Modern international practice, including MTE's current system, tends to use true volume calculations based on mid-diameter in cubic meters.
≠Grading is not tied to origin in IS 4895. In contrast, international standards like MTE's are intrinsically linked to the origin (Myanmar Teak), which implies specific wood properties (color, grain, density) beyond the visible defects graded.
≠Allowances for defects like sapwood can differ significantly. IS 4895 allows a sapwood margin based on girth, while rules for plantation teak (e.g., Indonesia) may have different allowances due to the faster growth and typically thicker sapwood layer.
Key Similarities
≈All standards are fundamentally based on grading logs by their external and visible features to predict the yield of high-quality, defect-free timber.
≈The types of defects assessed are largely universal, including knots (sound/unsound), cracks/splits, sweep (crookedness), taper, and hollowness (heart rot).
≈Measurement of dimensions for volume calculation is always done under bark to determine the net wood content of the log.
≈The principle of measuring log girth/diameter at the mid-point of the length is a common practice across IS 4895 and international systems like MTE's to average out the effect of log taper.