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IS 15786:2008 is the Indian Standard (BIS) for prelaminated cement bonded particle board -specification. This standard specifies the requirements and testing methods for prelaminated cement bonded particle boards. It covers aspects like materials, dimensions, physical and mechanical properties, surface quality, and workmanship. The boards are intended for interior use in applications like partitions, wall panelling, false ceilings, and furniture.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Ensure the core board conforms to IS 14862, as the final product's quality is highly dependent on it.
! These boards are heavy (density > 1000 kg/m³), so ensure the supporting framework for partitions or false ceilings is designed to handle the weight.
! For areas with potential moisture exposure, proper edge sealing is crucial to prevent water ingress, despite the material's good inherent resistance.
EN 634-2:2007CEN (European Committee for Standardization), European Union
HighCurrent
Cement-bonded particleboards - Specifications - Part 2: Requirements for OPC bonded particleboards for use in dry, humid and external conditions
Specifies requirements for the base cement bonded particle board, which is the substrate for the IS code product.
GOST 26816-2016Rosstandart (Federal Agency on Technical Regulating and Metrology), Russia
HighCurrent
Cement-particle boards. Specifications
Provides technical specifications for cement-bonded particle boards, aligning with the base material of the Indian Standard.
EN 14322:2021CEN (European Committee for Standardization), European Union
MediumCurrent
Wood-based panels - Melamine faced boards for interior uses - Definition, requirements and classification
Focuses on the laminated surface properties which are analogous to the 'prelaminated' aspect of the IS code, but for a different substrate.
EN 633:1995CEN (European Committee for Standardization), European Union
LowCurrent
Cement-bonded particleboards - Definition and classification
Provides the foundational definitions and classification system for CBPB, but lacks detailed technical specifications.
Key Differences
≠IS 15786 is an integrated standard covering both the cement-bonded particle board substrate and the prelaminated surface properties in one document. European standards are typically separate, with EN 634-2 for the substrate and standards like EN 14322 or EN 438 for the surface.
≠IS 15786 specifies two distinct grades (Grade I and Grade II) based on mechanical properties. In contrast, EN 634-2 uses a more complex classification system based on mechanical performance and intended use conditions (dry, humid, external).
≠The Indian standard includes specific surface tests like 'Resistance to Steam' and 'Resistance to Cracking' using a heated ball method, which are tailored for prelaminated products. EN 634-2 does not cover surface laminate properties.
≠The requirements for formaldehyde content are explicitly mentioned in IS 15786 as 'Practically free from formaldehyde' as cement is the primary binder. While EN standards also imply this for CBPB, the emphasis and specific test requirements for wood-based panels (E1/E2 classes) are more detailed in standards for resin-bonded boards.
Key Similarities
≈The fundamental composition of the core board is the same, consisting of wood particles or other lignocellulosic materials bonded with Ordinary Portland Cement (OPC) and chemical additives.
≈Both IS 15786 and equivalent substrate standards like EN 634-2 mandate testing for key mechanical properties such as Modulus of Rupture (Bending Strength) and Modulus of Elasticity to ensure structural performance.
≈Both standards use a 24-hour cold water immersion test to determine crucial durability parameters like 'Swelling in Thickness' and 'Water Absorption', which are critical for assessing performance in humid environments.
≈The specified density ranges are very similar. Both IS 15786 and typical boards under EN 634-2 fall within a high-density range of approximately 1000 to 1400 kg/m³, which is characteristic of this product type.
Parameter Comparison
Parameter
IS Value
International
Source
Bending Strength (MOR)
Grade I: ≥ 9.0 N/mm²; Grade II: ≥ 7.0 N/mm²
≥ 9.0 N/mm² (Characteristic value for typical boards 10-18mm thick)
EN 634-2:2007
Modulus of Elasticity (MOE)
Grade I: ≥ 3000 N/mm²; Grade II: ≥ 2500 N/mm²
≥ 3000 N/mm² (Characteristic value for typical boards)
EN 634-2:2007
Internal Bond Strength (Tensile Strength Perpendicular to Plane)
Grade I: ≥ 0.40 N/mm²; Grade II: ≥ 0.30 N/mm²
≥ 0.50 N/mm² (Characteristic value)
EN 634-2:2007
Swelling in Thickness (24h water immersion)
≤ 1.5 %
≤ 1.5 % (Mean value for boards in humid/external use)
What is the standard thickness tolerance for a 16mm board?+
±0.7 mm, as per Table 1 for thicknesses from >12mm up to 25mm.
What is the minimum required bending strength (Modulus of Rupture)?+
For boards thicker than 12mm, the minimum MOR is 9.0 N/mm² (Table 3).
What is the specified minimum density?+
The minimum density for all types is 1000 kg/m³ (Table 2).
Are these boards fire resistant?+
The standard specifies a test for resistance to spread of flame (Class I surface), but for a specific fire-resistance rating (e.g., 30/60 min), the entire assembly (including frame and fixings) must be tested as per IS 3809.