The 2010 edition of IS 15877 outlines the specifications and testing procedures for coir-faced blockboards suitable for interior and exterior uses. It details the raw materials, dimensions, mechanical and physical properties, preservative treatments, and environmental labeling standards to ensure product quality and longevity. This specification is vital for manufacturers, inspectors, and engineers working with coir-faced blockboards in construction and furniture sectors.
Overview
The 2010 edition of IS 15877 outlines the specifications and testing procedures for coir-faced blockboards suitable for interior and exterior uses. It details the raw materials, dimensions, mechanical and physical properties, preservative treatments, and environmental labeling standards to ensure product quality and longevity. This specification is vital for manufacturers, inspectors, and engineers working with coir-faced blockboards in construction and furniture sectors.
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Frequently Asked
The standard mandates that the coir fiber layer on blockboards must be uniform and have a minimum weight of 600 grams per square meter. Additionally, a layer of finer fibers such as jute or similar materials with at least 40 grams per square meter is used in combination with the coir layer to form the outer surface. Core strips consist of wooden pieces or compressed coir strips with specified maximum widths and densities depending on the grade. This combination ensures a durable and high-quality surface finish for coir-faced blockboards.
For bonding coir faced blockboards, the IS 15877 recommends using adhesives conforming to IS 848. Specifically, BWP (Boiling Water Proof) grade adhesives are used for BWP grade blockboards, suitable for exterior and high humidity conditions. MR (Moisture Resistant) grade adhesives are prescribed for MR grade blockboards, typically used in interior applications like furniture. These adhesives ensure strong bonding between the core strips and the surface fiber layers.
Mechanical properties testing involves preparing rectangular specimens with square-cut edges, conditioned at 27 ± 2°C and 65 ± 5% relative humidity until their mass stabilizes. The specimens are placed on a sturdy test table with a wooden batten to hold them firmly. Bending tests are performed to determine the modulus of rupture (maximum stress at failure) and modulus of elasticity (stiffness indicated by the elastic slope). The standard specifies minimum average values for these properties depending on the blockboard grade to ensure consistent quality.
Timber cores, especially the sapwood and species marked as requiring treatment, must undergo preservative treatment following IS 401. This includes water-soluble preservatives like boric acid and borax and fixed preservatives such as Copper-Chrome-Arsenic (CCA) and related compounds. Verification is done via spot tests on cross-sections or bore dust, where chemical reactions produce distinctive color changes (e.g., purple for chromium-based preservatives or bluish tint for boron-based treatments). The preservative must penetrate completely through the timber core to ensure adequate protection.
Dimensional tolerances for length, width, and thickness are strictly defined, with typical allowances of +6 mm/-0 mm for length, +3 mm/-0 mm for width, and ±5% for thickness. Edge straightness and squareness must be within 2 mm per 1000 mm length, verified using methods described in the standard's annexes. Surface quality requirements ensure the coir facing is smooth and free from defects such as delamination or irregularities. Boards must also maintain dimensional stability under varying humidity conditions without developing delamination or surface flaws.
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