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IS 13826:2000 (Part 6) is the Indian Standard (BIS) for bitumen-based felts - methods of the test, part 6: water absorption test. This standard (Part 6) specifies the laboratory method for determining the water absorption of bitumen-based felts. It outlines the procedure of immersing a sealed-edge specimen in water for 24 hours and calculating the percentage increase in mass, which is a key quality parameter for waterproofing materials.
Bitumen-based felts - Methods of the test, Part 6: Water absorption test
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp-Proofing
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
Key Clauses
Clause 3 - Principle
Clause 4 - Reagents
Clause 5 - Apparatus
Clause 6 - Test Specimen
Clause 7 - Procedure
Clause 8 - Calculation and expression of results
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).