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IS 8272:1984 is the Indian Standard (BIS) for gypsum plaster for use in the manufacture of fibrous plaster boards. This standard specifies the requirements for gypsum plaster used to manufacture fibrous plaster boards. It outlines the necessary physical properties, including fineness, setting time, transverse strength, and compressive strength, and references the appropriate testing methods.
gypsum plaster for use in the manufacture of fibrous plaster boards
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Building Limes and Gypsum Products
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
gypsumplasterfibrous plaster board
International Equivalents
Similar International Standards
ASTM C59/C59M-21ASTM International, USA
HighCurrent
Standard Specification for Gypsum Casting and Molding Plaster
Covers gypsum plaster specifically for casting and molding, directly aligning with the use case for fibrous boards.
EN 13279-1:2008CEN (European Committee for Standardization), Europe
MediumCurrent
Gypsum binders and gypsum plasters - Part 1: Definitions and requirements
A broad standard for gypsum plasters; its Type C1 (Casting plaster) is the relevant equivalent.
AS 2588-1996Standards Australia, Australia
HighCurrent
Gypsum plaster for casting
Specifies requirements for gypsum plaster intended for casting and decorative purposes, matching the IS code's intent.
BS 1191-1:1973BSI, United Kingdom
MediumWithdrawn
Specification for gypsum building plasters. Part 1. Excluding premixed lightweight plasters
Historical British standard that covered casting plasters before harmonization with European norms.
Key Differences
≠IS 8272 specifies transverse (flexural) strength, while the primary strength requirement in ASTM C59/C59M is compressive strength. This represents a fundamental difference in mechanical property assessment.
≠IS 8272 provides two distinct classes (Class A: 8-12 min, Class B: 20-30 min) for initial setting time, offering specific working time options. In contrast, ASTM C59 and EN 13279-1 only specify a minimum start of set (≥8 minutes), leaving the upper limit to the manufacturer.
≠The Indian standard requires a minimum transverse strength of 7.0 N/mm², which is significantly higher than the minimum flexural strength of 2.0 N/mm² required by EN 13279-1 for Type C1 casting plaster.
≠ASTM C59/C59M is stricter on fineness, allowing a maximum of 0.5% residue on a 150-µm sieve, compared to the 1.0% limit in IS 8272.
Key Similarities
≈All standards are focused on gypsum hemihydrate (Plaster of Paris) intended for casting applications, whether for fibrous boards, ornamental work, or general moulding.
≈The minimum initial setting time specified in IS 8272 (8 minutes for Class A) is consistent with the minimum requirement in both ASTM C59 and EN 13279-1 (≥8 minutes), ensuring a common baseline for workability.
≈Fineness is a critical parameter in all compared standards, with requirements specified by the amount of material retained on a fine sieve (typically 150-micron or US No. 100) to ensure a smooth finish.
≈The principle for determining setting time, using a Vicat-type apparatus to measure the plaster's resistance to needle penetration, is a common methodology across these standards.
Parameter Comparison
Parameter
IS Value
International
Source
Fineness (Residue on 150-micron sieve)
Max 1.0%
Max 0.5%
ASTM C59/C59M-21
Initial Setting Time
Class A: 8-12 min; Class B: 20-30 min
≥ 8 minutes
ASTM C59/C59M-21
Strength Test Method
Transverse Strength
Compressive Strength
ASTM C59/C59M-21
Strength Value (Transverse/Flexural)
Min 7.0 N/mm²
Min 2.0 N/mm²
EN 13279-1:2008 (Type C1)
Strength Value (Compressive)
Not Specified
Min 12.4 N/mm² (1800 psi)
ASTM C59/C59M-21
Strength Value (Compressive)
Not Specified
Min 6.0 N/mm²
EN 13279-1:2008 (Type C1)
Freedom from Coarse Particles (Retained on 1.18 mm sieve)
Nil
Not explicitly specified in same manner, but covered under broader 'Fineness' or 'Purity' clauses.
ASTM C59/C59M-21
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Fineness (residue on 150-micron sieve), max1.0 % by mass
Initial Setting Time10 to 20 minutes
Final Setting Time, max30 minutes
Compressive Strength, min14.0 N/mm²
Transverse Strength (breaking load), min30 N
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements for Gypsum Plaster for Use in the Manufacture of Fibrous Plaster Boards