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IS 13826:2000 (Part 2) is the Indian Standard (BIS) for bitumen based felts - methods of test, part 2: pliability test. This standard (Part 2) details the laboratory procedure for conducting the pliability test on bitumen-based waterproofing felts. It specifies the apparatus, sample preparation, conditioning, and bending method to evaluate the material's flexibility and resistance to cracking when bent around a mandrel at a specified temperature.
Bitumen based felts - Methods of test, Part 2: Pliability test
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp-Proofing
! This is a destructive test primarily used for quality control by manufacturers and for third-party verification.
! Ensure adequate ventilation and use appropriate personal protective equipment (PPE) when handling solvents like trichloroethylene.
! The accuracy of the result is highly dependent on drying the sample to a constant mass before and after extraction.
Frequently referenced clauses
Cl. 3Principle
Cl. 4Reagents
Cl. 5Apparatus
Cl. 6Test Specimen
Cl. 7Procedure
Cl. 8Calculation and expression of results
bitumen feltwaterproofing membranebitumen
International Equivalents
Similar International Standards
EN 12311-1:2013CEN (European Committee for Standardization), Europe
HighCurrent
Flexible sheets for waterproofing - Part 1: Bitumen sheets for roof waterproofing - Determination of tensile properties
Directly specifies the test method for tensile properties (breaking strength, elongation) of bitumen sheets.
ASTM D5147-19ASTM International, USA
HighCurrent
Standard Test Methods for Sampling and Testing Modified Bituminous Sheet Materials
Covers testing procedures for modified bitumen sheets, including a very similar tensile strength test.
ISO 28280:2012ISO (International Organization for Standardization), International
HighWithdrawn
Flexible sheets for waterproofing — Bitumen, plastic and rubber sheets for roof waterproofing — Determination of tensile properties
Was the international standard for tensile properties, now largely harmonized with the EN standard.
ASTM D228-18ASTM International, USA
MediumCurrent
Standard Test Methods for Sampling, Rinsing, and Testing Bitulithic Saturated Felts and Woven Fabrics Used in Roofing and Waterproofing
Covers older, traditional saturated felts, with a tensile test that forms the basis for modern methods.
Key Differences
≠The standard test temperature in IS 13826 is 27 ± 2 °C, whereas most international standards like EN 12311-1 and ASTM D5147 specify 23 ± 2 °C.
≠IS 13826 specifies a gauge length (initial jaw separation) of 200 mm, which matches EN 12311-1, but differs significantly from ASTM D5147 which specifies 75 mm.
≠The test specimen width in ASTM D5147 is 25 mm (1 inch), whereas both IS 13826 and EN 12311-1 specify a width of 50 mm.
≠The rate of jaw separation in ASTM D5147 is often lower (e.g., 50 mm/min or based on a strain rate) compared to the fixed 100 ± 10 mm/min required by IS 13826 and EN 12311-1.
Key Similarities
≈All standards employ a Constant Rate of Extension (CRE) tensile testing machine to apply force.
≈The primary objective across all standards is to determine the maximum tensile force (breaking strength) and elongation at break for bitumen-based felts.
≈Testing is required on specimens cut from both the longitudinal (machine) and transverse (cross-machine) directions of the felt roll.
≈The result is typically reported as force per unit width (e.g., N/50 mm or N/m), providing a normalized strength value independent of the test specimen's width.
Parameter Comparison
Parameter
IS Value
International
Source
Test Specimen Width
50 ± 0.5 mm
50 ± 0.5 mm
EN 12311-1
Test Specimen Width
50 ± 0.5 mm
25.0 ± 1.0 mm
ASTM D5147
Gauge Length (Initial Jaw Separation)
200 mm
200 mm
EN 12311-1
Gauge Length (Initial Jaw Separation)
200 mm
75 ± 1 mm
ASTM D5147
Rate of Jaw Separation
100 ± 10 mm/min
100 ± 10 mm/min
EN 12311-1
Standard Conditioning Temperature
27 ± 2 °C
23 ± 2 °C
EN 12311-1 / ASTM D5147
Standard Conditioning Humidity
65 ± 5% RH
50 ± 5% RH
EN 12311-1 / ASTM D5147
Number of Specimens per Direction
5
5
EN 12311-1 / ASTM D5147
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Sample drying temperature105 ± 5 °C
Test specimen area100 cm²
Analytical balance accuracy0.001 g
Key Formulas
Binder Content, % by mass = ((M1 - M2) / M1) * 100
Tables & Referenced Sections
Key Tables
No tables data
Frequently Asked Questions4
What is the principle behind this test method?+
The test uses solvent extraction to dissolve and remove the bitumen binder from a pre-weighed felt sample, allowing the binder's mass to be determined by the difference in weight.
Why is determining binder content important for bitumen felts?+
Binder content is a critical quality parameter that directly influences the felt's waterproofing effectiveness, flexibility, and durability. Incorrect content can lead to premature failure.
What equipment is essential for this test?+
A Soxhlet extraction apparatus, an analytical balance, and a laboratory oven are the primary pieces of equipment required as per the standard.
What is the typical specimen size for the test?+
The standard recommends a test specimen with an area of 100 cm² (e.g., 100 mm x 100 mm).