The 2004 edition of IS 1659 outlines the technical specifications for block boards utilized in Indian construction, furniture, and interior design sectors. It categorizes boards into two primary grades, BWP suitable for high moisture and outdoor applications, and MR intended for interior environments. The standard governs material selection, dimensions, adhesive qualities, mechanical strength, preservative treatments, and includes provisions for eco-friendly certification through ECO-Mark.
Overview
The 2004 edition of IS 1659 outlines the technical specifications for block boards utilized in Indian construction, furniture, and interior design sectors. It categorizes boards into two primary grades, BWP suitable for high moisture and outdoor applications, and MR intended for interior environments. The standard governs material selection, dimensions, adhesive qualities, mechanical strength, preservative treatments, and includes provisions for eco-friendly certification through ECO-Mark.
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Frequently Asked
The BWP (Boiling Water Proof) grade block boards are designed for external environments and areas with high humidity, such as bus bodies and railway coaches, utilizing waterproof adhesives per IS 848. Conversely, MR (Moisture Resistant) grade boards are intended for internal use like furniture and partitions, employing moisture-resistant adhesives also specified in IS 848. BWP boards offer superior resistance to moisture and weather conditions, whereas MR boards are suitable for drier indoor settings.
IS 1659 mandates the use of adhesives conforming to IS 848 standards. For BWP grade block boards, adhesives classified as boiling water proof (BWP) are required to ensure waterproof bonding suitable for exterior applications. MR grade boards use moisture-resistant (MR) adhesives suitable for interior environments with moderate moisture exposure. These adhesives guarantee the necessary bonding strength and durability aligned with the intended board grade.
The standard prescribes a qualitative test where a chisel is inserted along the glue line between the core strips and the adjacent veneers, and force is applied to separate them in the direction of the core. Bond quality is assessed based on the presence and amount of wood fibers torn from the surfaces after separation. A strong bond is indicated by difficult separation and abundant torn fibers; moderate resistance is acceptable, while easy separation with minimal fiber adhesion is deemed poor and grounds for rejection.
Typical dimensional tolerances for block boards, as per IS 1659, include a length variation allowance of +6 mm and no negative deviation, width tolerance of +3 mm with no negative deviation, and thickness tolerance of ±5%. Thickness variation within a single board should not exceed 0.5 mm. Standard sizes include lengths such as 2440 mm, 2140 mm, and 1830 mm, with widths commonly at 1220 mm and 920 mm. Custom sizes can be negotiated between buyer and manufacturer.
To be eligible for ECO-Mark under IS 1659, block boards must be made from timber sourced exclusively from non-natural forests, including plantations like rubber, cashew, social forestry, and shade trees from tea or coffee estates. They must undergo preservative treatment ensuring through-and-through penetration verified by the spot test method in Annex K. Each board must be clearly labeled with manufacturing details, grade, size, batch number, and ECO-Mark criteria. Additionally, manufacturers must provide documentary evidence to BIS and ensure the product carries the BIS Standard Mark, ensuring environmental compliance and traceability.
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