The standard delineates the specifications and test procedures for coir hardboard intended for general applications. It details the physical, mechanical, and performance criteria for medium, standard, and tempered coir hardboards fabricated from coir fibers and other lignocellulosic substances. This guideline is crucial for manufacturers, quality assurance professionals, and engineers engaged in the fabrication, evaluation, and utilization of coir-based panel products within construction and furniture sectors.
Overview
The standard delineates the specifications and test procedures for coir hardboard intended for general applications. It details the physical, mechanical, and performance criteria for medium, standard, and tempered coir hardboards fabricated from coir fibers and other lignocellulosic substances. This guideline is crucial for manufacturers, quality assurance professionals, and engineers engaged in the fabrication, evaluation, and utilization of coir-based panel products within construction and furniture sectors.
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Frequently Asked
IS 15878 specifies the density ranges for coir hardboards as follows: Medium coir hardboard has a density between 350 and 850 kg/m³, standard coir hardboard has a density not less than 800 kg/m³, and tempered coir hardboard, being a treated variant, generally meets or exceeds the standard type's density requirements. These classifications aid in choosing boards based on strength and intended use.
Moisture content determination involves cutting two square specimens of 100 ±1 mm, weighing them precisely, drying in an oven at 103 ±2°C until mass stabilizes, and then reweighing. Moisture content (%) is calculated by the weight difference between wet and dry states divided by dry weight, multiplied by 100. The average of the two specimens is reported. Acceptable moisture limits vary per product type, as outlined in the standard's Table 1.
Mechanical strength assessment includes breaking load tests on specimens (200 mm × 75 mm) with a minimum load of 360 N for tempered boards, modulus of rupture (minimum 50 N/mm² for tempered types), tensile strength parallel to surface (minimum 0.25 N/mm² for tempered boards), and modulus of elasticity (minimum 4000 N/mm² for tempered boards). Additional tests such as flame spread resistance, drop impact, and flexibility are also required for tempered coir hardboards.
The flame spread test requires specimens approximately 150 mm by 25 mm held at a 45° angle with the finished surface facing up and down. A 25 mm wide luminous flame is applied to the specimen's lower end for 30 seconds, removed for 30 seconds, then reapplied for another 30 seconds. The specimen must not continue burning beyond 20 seconds after flame removal. Tests are conducted on three specimens, with the middle value used for assessment.
Flexibility is tested by bending 400 mm × 75 mm samples 180° around a 250 mm diameter mandrel; samples must show no visible cracks post-bending. Impact resistance involves dropping a weight from 130 mm height on 100 mm × 100 mm specimens supported on a ring; no punctures and only minor cracks within a 20 mm diameter are acceptable. Three specimens are tested for each to confirm compliance.
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