non-coniferous timber in converted form for ammunition/explosives boxes

The scope of IS 5806 covers specifications related to non-coniferous sawn timber for further conversion, including definitions from IS 707-1968 and rules for rounding off numerical values (Clause 2.0). It specifies measurement rules for nominal sizes of timber planks and scantlings, where length, width, and thickness are based on accepted sizes without adding plus tolerances for cubical content calculations (Clause 6.1). Tolerances permitted on nominal sizes are detailed in Clause 4.2 as follows:

Note that minus tolerance in width is limited to 10% of supplies, and for width ranges (e.g., 150 to 250 mm), minus tolerance on minimum and plus tolerance on maximum widths are not permitted (Clause 4.2).

Sources: Clause 2.0, Clause 6.1, Clause 4.2

As per IS 5806 Clause 2.0, the definitions applicable to this standard refer primarily to those given in IS 707-1968, which covers specifications for non-coniferous sawn timber for further conversion. Key measurement definitions from Clause 6.1.1 specify:

• Length: Measured in metres, fractions taken in multiples of 0.01 m, rounded down to nearest 0.05 m.
• Width: Measured in centimetres, rounded down to nearest 1 cm.
• Thickness: Measured in centimetres, rounded down to nearest 0.5 cm.
• Volume: Computed in cubic metres, accurate to three decimal places based on accepted sizes.

Additionally, Appendix A (Clause 3.1) provides a table of common trade names, abbreviations, and botanical names of timbers covered under the standard, such as Teak (TEA) - Tectona grandis Linn. f., Sissoo (SIS) - Dalbergia sissoo Roxb., and others.

These definitions and specifications form the basis for measurement, identification, and classification of timber under IS 5806.

Sources: Clause 2.0, Clause 6.1.1, Clause 3.1

As per IS 5806 Clause 3.1 and Appendix A, the timber species permitted for ammunition boxes are specifically listed. These are non-coniferous timbers suitable for converted form use in ammunition/explosives boxes. The key species include:

This list is definitive for timber selection in ammunition boxes as per the standard. No specific formulas or dimensional tables are provided in the retrieved context for these species, but seasoning and conversion practices are referenced in the code amendments.

Sources: Clause 3.1, Appendix A

As per Clause 4.2 of IS 5806, the permitted tolerances on nominal timber sizes are:

Note that the minus tolerance on width (-2 mm) shall not exceed 10% of supplies at one time, and for specified width ranges (e.g., 150 to 250 mm), minus tolerance on minimum and plus tolerance on maximum widths are not allowed. According to Clause 6.1, length, width, and thickness are measured on accepted sizes, and plus tolerances are not added when calculating volume. The dimensions shall conform to the ordered sizes as per Clause 4.1. These specifications ensure quality and uniformity in timber for ammunition boxes.

Sources: Clause 4.2, Clause 6.1, Clause 4.1

The key general requirements from IS 5806 include dimensional tolerances and measurement methods. As per Clause 4.2, the permissible tolerances on nominal sizes are:

*Note: The -2 mm tolerance in width is allowed in not more than 10% of supplies, and no minus tolerance is allowed when a definite width range is specified (Clause 4.2).

For measurements (Clause 6.1.1):

• Length: measured in meters, fractions rounded down to nearest 0.05 m
• Width: measured in cm, rounded down to nearest 1 cm
• Thickness: measured in cm, rounded down to nearest 0.5 cm
• Volume: computed in cubic meters to three decimal places

These ensure uniformity and quality control in timber sizing and volume calculation.

Sources: Clause 4.2, Clause 6.1.1

As per Clause 6.1 of IS 5806, the measurement of timber (planks and scantlings) is based on their nominal sizes (length, width, and thickness) as per accepted sizes without adding any plus tolerances when calculating cubical contents. This means the actual dimensions used for volume calculations are the nominal dimensions, not the maximum possible sizes including tolerances. Additionally, the standard references specifications for cut sizes and maximum permissible moisture content for timber depending on use and climatic zones. Appendix A lists the approved timber species for ammunition boxes, including Teak (TEA), Sissoo (SIS), and Mango (MAN), among others. No explicit formulas are provided for measurement, but the key principle is to use nominal sizes directly for volume and quantity calculations.

Sources: Clause 6.1, Appendix A (Clause 3.1)

As per IS 5806 Clause 7, permissible defects in timber ammunition boxes are specified collectively, not singly, and evaluated as per IS 3364-1965. Key permissible defects include:

• Cracks (Clause 7.5):

  • Face cracks up to 2 mm wide, max length 25 mm per 300 mm length.
  • Edge cracks up to 3 mm wide, max length 25 mm per 300 mm length.
  • End cracks up to 3 mm wide, max length 15 mm per 300 mm length.

• Live Knots (Clause 7.4.1):

  • Up to 15 mm diameter allowed if not excessive or grouped.
  • Over 15 mm diameter allowed only one knot per 750 mm length:
    • For width ≤150 mm, knot diameter ≤ 1/4 width.
    • For width >150 mm, knot diameter ≤ 40 mm.

Plugging of defects is not permissible (Clause 7.1). Measurements of length, width, thickness, and volume are as per Clause 6.1.1.

These limits ensure structural integrity and usability of timber boxes.

Sources: Clause 6.1.1, Clause 7.1, Clause 7.4.1, Clause 7.5

As per IS 5806 Clause 8.1, each piece of timber shall be legibly and indelibly branded at a convenient place with the supplier's name, initials, or recognized trademark, and the year of supply. The letters used for branding should be of suitable size for clear identification. This ensures traceability and quality control of timber supplied.

Additionally, timber species are identified by trade names and abbreviations as per Appendix A (Clause 3.1), which lists common non-coniferous timbers with their botanical names, for example:

This branding and marking practice is essential for proper identification and preservation of timber quality.

Sources: Clause 8.1, Appendix A (Clause 3.1)

As per IS 5806 Clause 9.1, all timbers containing sapwood must receive preservative treatment with the requisite absorption specified against Group 5 of Table 2 in IS 401-1967 (Code of Practice for Preservation of Timbers). This ensures durability and protection against decay. Additionally, Clause 7.6 permits the use of sapwood only if treated according to Clause 9. For identification, Clause 8.1 mandates each timber piece to be legibly branded with supplier details and year of supply. Appendix A (Clause 3.1) lists common timber species with their trade names, abbreviations, and botanical names used in the specification.

Key points:

• Preservation treatment mandatory for sapwood (Clause 9.1)
• Treatment absorption as per IS 401-1967 Table 2, Group 5
• Branding requirements (Clause 8.1)
• List of timber species provided in Appendix A

No direct formulas are provided in the retrieved context for preservation treatment quantities or methods; refer to IS 401-1967 for detailed absorption values and treatment procedures.

Sources: Clause 9.1, Clause 7.6, Clause 8.1, Appendix A (Clause 3.1)

As per IS 5806 Clause 10.1, to prevent end cracking and splitting, the ends of each plank and scantling shall be coated with materials specified in IS 1141-1958. The coating must extend at least 25 mm beyond the length of the longest visible split. This end coating should be applied immediately after timber inspection to be effective. Additionally, Clause 9.1 mandates preservative treatment for timbers containing sapwood as per IS 401-1967 Table 2, Group 5 absorption requirements. The standard also provides a list of common timber species in Appendix A (Clause 3.1) for reference. Key measurement rules for timber dimensions are in Clause 6.1.1, ensuring precise length, width, thickness, and volume calculations for quality control.

Sources: Clause 10.1, Clause 9.1, Clause 6.1.1, Appendix A (Clause 3.1)

As per IS 5806 Clause 5.2, the moisture content of timber planks and scantlings at the time of inspection shall not exceed 12% unless otherwise specified. This moisture content is determined according to the method given in IS 287-1960. No specific formulas or tables for moisture content are provided in the retrieved context, but the key specification is the maximum permissible moisture content of 12%.

Sources: Clause 5.2

IS 5806 references several related Indian Standards and publications relevant to timber and timber products, as per Clause 12.00 and Clause 2.0. Key related standards include:

• IS 707-1968: Definitions for timber and timber products.
• IS 401-1967: Prophylactic treatment specifications for sapwood and heartwood (Clause 9.1).
• Various IS standards on sawn timber, grading, cut sizes, and specific timber uses, such as IS 190-1960 (Coniferous sawn timber), IS 1326-1958 (Non-coniferous sawn timber), IS 1331-1966 (Cut sizes of timber), IS 3364-1965 (Measurement and evaluation of defects), and others listed in the table under Clause 12.00.

Additionally, Clause 4.2 provides dimensional tolerances for timber width and thickness:

These references and specifications form the basis for timber quality, treatment, and dimensional control in IS 5806.

Sources: Clause 12.00, Clause 2.0, Clause 9.1, Clause 4.2

As per Clause 3.1 and Appendix A of IS 5806, the approved timber species for ammunition/explosives boxes are listed in the following table with their trade names, abbreviations, and botanical names:

Additionally, Clause 9.1 mandates preservative treatment for timbers containing sapwood as per IS 401-1967. No formulas are specified for species selection; the list is definitive for compliance.

Sources: Clause 3.1, Appendix A, Clause 9.1