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IS 12458:1988 is the Indian Standard (BIS) for method of fire resistance test of firestops. This standard outlines the method for conducting fire resistance tests on firestop systems used to seal openings and penetrations in fire-rated walls and floors. It specifies the test furnace conditions, specimen preparation, test procedure, and the criteria for failure based on integrity and insulation performance.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! This test evaluates a complete 'system' (firestop material, penetrating service, and surrounding structure), not just the firestop material in isolation.
! The test result is a fire resistance rating in minutes (e.g., 60, 120), which determines the suitability of the firestop for a specific fire compartment wall/floor rating.
! Correct furnace pressure control is critical as it simulates the forces that push hot gases and flames through any weaknesses in the firestop.
Standard Test Method for Fire Tests of Through-Penetration Fire Stops
Specifies a method for determining the fire resistance of through-penetration firestops, including a hose stream test.
UL 1479 (Edition 6)Underwriters Laboratories (UL), USA
HighCurrent
Fire Tests of Through-Penetration Firestops
Harmonized with ASTM E814, it provides the primary test method for firestop certification in North America.
EN 1366-3:2021CEN (European Committee for Standardization), Europe
HighCurrent
Fire resistance tests for service installations - Part 3: Penetration seals
Provides the primary European method for determining the fire resistance of penetration seals to maintain fire separation.
AS 1530.4:2014Standards Australia, Australia
MediumCurrent
Methods for fire tests on building materials, components and structures - Part 4: Fire-resistance test of elements of construction
A broader fire testing standard where Section 10 specifically covers the testing method for service penetrations and control joints.
Key Differences
≠IS 12458 does not require a hose stream test, which is a mandatory component for achieving an 'F' Rating under ASTM E814/UL 1479 to assess structural integrity after fire exposure.
≠The classification system differs. IS 12458 provides a single 'Fire Resistance Rating' in minutes, whereas ASTM E814 uses 'F' (Flame/Hose Stream) and 'T' (Temperature) ratings, and EN 1366-3 uses 'E' (Integrity) and 'I' (Insulation) classifications.
≠Furnace pressure control in IS 12458 is specified simply as a 'slightly positive pressure'. Modern standards like EN 1366-3 and ASTM E814 have much more detailed requirements for establishing and controlling a positive pressure gradient over the height of the specimen.
≠IS 12458:1988 is less detailed on specific test configurations for modern services (e.g., large cable bundles, plastic pipes with intumescent devices) compared to the highly prescriptive and regularly updated EN 1366-3 and UL 1479.
Key Similarities
≈All standards use a similar standard time-temperature curve for furnace control, based on the curve defined in ISO 834.
≈The criteria for 'Integrity' failure are fundamentally the same, based on the ignition of a cotton pad, the presence of gaps exceeding a certain size, and sustained flaming on the unexposed face.
≈The criteria for 'Insulation' failure are nearly identical across standards, defined by a maximum average temperature rise (140°C) and a maximum single point temperature rise (180°C) on the unexposed surfaces.
≈The basic test principle is consistent: a representative firestop system installed in a separating element (wall or floor) is subjected to a controlled fire in a furnace to measure its performance.
Parameter Comparison
Parameter
IS Value
International
Source
Hose Stream Test
Not required.
Mandatory for 'F' rating; a duplicate specimen is subjected to a high-pressure water stream after fire exposure.
ASTM E814
Primary Rating/Classification
Fire Resistance Rating (FRR) in minutes.
EI Classification (e.g., EI 120), where E = Integrity and I = Insulation.
EN 1366-3
Insulation Failure: Average Temperature Rise
Shall not exceed 140°C above initial temperature.
Shall not exceed 140°C above initial average temperature.
EN 1366-3
Insulation Failure: Max Single Point Temperature Rise
Shall not exceed 180°C above initial temperature.
Shall not exceed 180°C above initial temperature.
ASTM E814
Integrity Failure: Cotton Pad Test
Ignition of cotton pad held for 10 seconds over any crack or fissure.
Ignition of cotton pad applied for up to 30 seconds to any openings.
EN 1366-3
Furnace Pressure
Slightly positive, approximately 1 mm of water gauge (~10 Pa).
Positive pressure is established at a certain height (e.g., neutral axis at 500mm from floor for walls).
EN 1366-3
Temperature on Penetrating Service ('T' or 'I' Rating)
Max temperature rise of 180°C at 25 mm from the firestop.
Max temperature rise of 180°C at 1 inch (25.4 mm) from the firestop surface.
ASTM E814
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Insulation Failure (Average Temp Rise)140 °C
Insulation Failure (Max Temp Rise)180 °C
Integrity Failure (Gap Gauge for cracks)6 mm
Integrity Failure (Gap Gauge for openings)25 mm
Furnace Pressure at mid-height (or higher)+10 ± 2 Pa
To determine the fire-resistance rating (in minutes) of a firestop system when exposed to a standard fire, assessing its ability to prevent the passage of fire and hot gases.
What constitutes an 'Integrity' failure?+
Failure occurs if a cotton pad on the unexposed face ignites, sustained flaming of over 10 seconds occurs, or if specific sized gap gauges (6mm or 25mm) can penetrate the specimen (Clause 7.2).
What constitutes an 'Insulation' failure?+
Failure occurs if the average temperature on the unexposed face rises by more than 140°C, or the maximum temperature at any point rises by more than 180°C above the initial ambient temperature (Clause 7.3).
What fire exposure condition is used in the test?+
The test uses the standard time-temperature curve and furnace conditions as specified in IS 3809 (Clause 6.1).