IS 1140:1988 is the Indian Standard (BIS) for logs for matches. This standard specifies the requirements for timber logs used in the manufacture of matches. It outlines acceptable timber species, required dimensions, and permissible defects to ensure the logs are suitable for peeling into veneers for match splints and boxes.
logs for matches
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Measurement Unit | Girth (circumference) in centimeters (cm) | Diameter in millimeters (mm) or centimeters (cm) | EN 1927:2021 |
| Volume Calculation Formula | Quarter-girth formula: V = (G/4)² * L | Huber's formula: V = (π/4 * Dm²) * L | ISO 4480:2020 |
| Measurement Point for Girth/Diameter | At the mid-length of the log, over bark. | At the mid-point of the log, under bark, as an average of two perpendicular measurements. | UNECE Standard Hw/R:2017 |
| Minimum Girth Requirement | Minimum 75 cm over bark at mid-length. | Varies by quality class, e.g., minimum top diameter of 25 cm for Quality Class A. | UNECE Standard Hw/R:2017 |
| Standard Log Lengths | Multiples of 0.3 m (e.g., 1.5 m, 1.8 m, 2.1 m). | Preferred lengths in multiples of 1.0 m; other lengths by agreement. | EN 1927:2021 |
| Handling of Knots (High Grade) | Permits sound, tight knots up to a specified diameter (e.g., 5 cm). | Permits sound, intergrown knots up to a diameter relative to the log diameter (e.g., < 4 cm for Class A). | UNECE Standard Hw/R:2017 |
| End-Use Specificity | Specific to logs for match splints and boxes. | General classification for a range of uses (veneer, sawing, pulpwood). | EN 1927:2021 |