The IS 14276:1995 standard delineates the specifications and testing procedures for cement bonded particle boards utilized in building and furniture manufacturing. It details crucial physical, mechanical, and chemical attributes such as density, moisture content, water absorption, swelling, strength, and workability to ensure the boards' longevity and effectiveness. This code is essential for producers, quality assurance personnel, and design professionals handling cement bonded particle boards.
Overview
The IS 14276:1995 standard delineates the specifications and testing procedures for cement bonded particle boards utilized in building and furniture manufacturing. It details crucial physical, mechanical, and chemical attributes such as density, moisture content, water absorption, swelling, strength, and workability to ensure the boards' longevity and effectiveness. This code is essential for producers, quality assurance personnel, and design professionals handling cement bonded particle boards.
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Contents
Structure
This section defines the application range of cement bonded particle boards, outlining critical physical and mechanical property requirements. It includes a summary table highlighting minimum density, moisture content range, water absorption limits for 2 and 24-hour immersion, swelling limits in thickness, length, and width, and minimum values for modulus of rupture and elasticity. Testing conditions such as soaking parameters and accelerated ageing are also specified along with sampling methods according to IS 2380 (Part 4):1977.
Lists the Indian standards referenced within IS 14276, including IS 707:1976 for terminology and IS 2380 (Part 4):1977 for test specimen dimensions. The section also presents key mechanical properties with average and minimum individual values for modulus of rupture and modulus of elasticity under dry and wet conditions, following prescribed sampling and testing protocols.
Provides essential definitions relevant to cement bonded particle boards, with primary reference to Clause 3.1 of IS 14276 and supplementary definitions from IS 707:1976. This section also summarizes the physical and mechanical property requirements such as density, moisture content, water absorption, swelling, strength parameters, screw withdrawal forces, and pH range.
Details the material characteristics required for cement bonded particle boards, including minimum density, moisture content limits, maximum water absorption and swelling, along with mechanical property thresholds like modulus of rupture, elasticity, tensile strength perpendicular to surface, screw withdrawal strength, and pH values. Testing conditions and specimen dimensions are also described.
Describes the production stages of cement bonded particle boards, emphasizing the importance of maintaining specified density and moisture content, controlling water absorption and swelling, and achieving required mechanical strengths. It outlines testing requirements post-production and references the relevant Indian standards for sampling and mechanical testing.
Summarizes the overarching physical and mechanical requirements that cement bonded particle boards must satisfy, including density, moisture content, water absorption, swelling, modulus of rupture and elasticity, tensile strength, screw withdrawal strength, and pH range. Notes on testing under wet conditions, accelerated ageing, and sampling procedures are included.
Specifies the allowable tolerances for board dimensions such as length, width, and thickness with references to unsanded board tolerances. It addresses uniformity in thickness and density, flatness, and smoothness, and outlines measurement standards per IS 2380 (Part 2):1977 including edge straightness and squareness to ensure proper fitment.
Presents detailed physical characteristics including minimum density, moisture content range, water absorption limits at 2 and 24 hours, swelling limits in thickness, length and width, and mechanical properties such as modulus of rupture and elasticity for dry and wet conditions. It also covers tensile strength perpendicular to the surface, screw withdrawal strength, and pH measurement procedures, along with thickness tolerance, edge straightness, and squareness requirements.
Outlines the quantity of boards to be sampled from different lot sizes and lists the required physical and mechanical properties to be inspected. It includes detailed testing requirements for density, moisture, water absorption, swelling, mechanical strength, screw withdrawal strength, and pH values, along with special testing conditions such as wet specimen soaking and accelerated ageing protocols.
Details the preparation of test specimens including the number required for dry and wet conditions, specimen dimensions per IS 2380 (Part 4):1977, and the mechanical property tests to be conducted. It describes the failure protocol requiring doubling the testing specimens and criteria for lot acceptance or rejection.
Explains the conditions under which cement bonded particle boards may bear the BIS Standard Mark, indicating conformity to IS 14276. It includes the mechanical property requirements necessary for certification, specimen testing requirements, and criteria for lot acceptance.
Lists annexed Indian standards relevant for complementary reference, provides amended mechanical property tables, reiterates test specimen preparation and conditioning requirements, and includes formulas for calculating modulus of elasticity and rupture. It emphasizes adherence to the latest standards and testing methodologies.
Frequently Asked
Per IS 14276 Clause 10.10, cement bonded particle boards must have a minimum density of 1250 kg/m³ and maintain moisture content between 6% and 12%. These parameters ensure the boards’ structural integrity and dimensional stability. Additionally, water absorption should not exceed 13% after 2 hours of soaking and 25% after 24 hours, with swelling limits controlled to maintain performance.
Wood species used must not impede cement setting; if they do, additives like sodium silicate (IS 381:1972) and aluminium sulphate (IS 260:1969) are added to counteract this effect. Wood particles should be limited to maximum dimensions of 15 mm length, 3 mm width, and 0.3 mm thickness. Cement used should conform to IS 8112:1989 (Ordinary Portland Cement) or IS 12269:1987 (53 Grade OPC) to ensure proper bonding and durability.
According to IS 14276 Clause 10.6 and Table 1, the maximum swelling allowed after water immersion is 20% in thickness, and 0.5% each in length and width after 2 hours of soaking. These limits guarantee the dimensional stability of the boards when exposed to moisture.
Screw withdrawal strength is evaluated following IS 2380 (Part 14):1977 by inserting a screw into the specimen and applying axial tensile force until it withdraws. The average force required must meet or exceed the minimum values specified in IS 14276 Table 1, such as 1250 N on the face and 850 N on the edge. Testing includes specimens subjected to dry and accelerated ageing conditions to verify joint durability.
Samples are selected based on lot size (e.g., 2 boards for up to 50 units, 10 boards for lots above 500). Specimens are cut at least 150 mm from edges with sizes varying by test: for density and moisture content, 150 x 75 x full thickness; for water absorption, 300 x 300 x full thickness; for swelling, 200 x 100 x full thickness; and for mechanical tests, specimens conform to IS 2380 (Part 4):1977. Typically, three specimens are tested for each condition, with doubling if failures occur.
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