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IS 8374 : 1977Bitumen Mastic, Anti-Static and Electrically Conducting Grade

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IEC 61340-5-1 · BS EN 13813 · ASTM F150 / F150M - 18
CurrentSpecializedSpecificationBIMMaterials Science · Flooring, Wall Finishing and Roofing
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OverviewValues4InternationalTablesFAQ3Related

IS 8374:1977 is the Indian Standard (BIS) for bitumen mastic, anti-static and electrically conducting grade. This standard specifies the requirements for two grades of bitumen mastic—anti-static and electrically conducting—used for specialized flooring applications. It covers the material composition, physical properties like hardness and softening point, and the critical electrical resistance values necessary to prevent electrostatic discharge in sensitive environments.

Bitumen Mastic, Anti-Static and Electrically Conducting Grade

Overview

Status
Current
Usage level
Specialized
Domain
Materials Science — Flooring, Wall Finishing and Roofing
Type
Specification
International equivalents
IEC 61340-5-1:2016 · International Electrotechnical Commission (IEC), InternationalBS EN 13813:2002 · British Standards Institution (BSI), UK / European Committee for Standardization (CEN), EuropeASTM F150 / F150M - 18 · American Society for Testing and Materials (ASTM), USA
Typically used with
IS 73IS 1205IS 1208IS 334
Also on InfraLens for IS 8374
4Key values2Tables3FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! The primary application is for safety flooring in areas like hospital operating theatres, electronics manufacturing, and explosive handling facilities to dissipate static electricity safely.
! Electrical continuity is paramount. The resistance of the installed floor must be tested and verified as per the standard before the area is commissioned.
! Proper surface preparation of the substrate is crucial for both adhesion and achieving the specified electrical properties.
Frequently referenced clauses
Cl. 3ConstituentsCl. 4Physical RequirementsCl. 5Electrical ResistanceCl. 7Tests
Pulled from IS 8374:1977. Browse the full clause & table index below in Tables & Referenced Sections.
bitumenmasticflooringanti-staticconductive

International Equivalents

Similar International Standards
IEC 61340-5-1:2016International Electrotechnical Commission (IEC), International
MediumCurrent
Electrostatics - Part 5-1: Protection of electronic devices from electrostatic phenomena - General requirements
Specifies the performance requirements for an ESD control program, including flooring resistance, which IS 8374 aims to meet.
BS EN 13813:2002British Standards Institution (BSI), UK / European Committee for Standardization (CEN), Europe
MediumCurrent
Screed material and floor screeds - Screed material - Properties and requirements
A performance-based standard for floor screeds; allows for specifying electrical conductivity, covering the functional aspect of IS 8374.
ASTM F150 / F150M - 18American Society for Testing and Materials (ASTM), USA
LowCurrent
Standard Test Method for Electrical Resistance of Conductive and Static Dissipative Resilient Flooring
Not a material specification, but the standard US test method for the key property (electrical resistance) of such flooring.
BS 2050:1978British Standards Institution (BSI), UK
HighWithdrawn
Specification for electrical resistance of conductive and anti-static products made from flexible polymeric material
A near-contemporary standard specifying resistance ranges for anti-static and conductive products, though for polymers, not bitumen.
Key Differences
≠IS 8374 is a prescriptive material standard, specifying composition like binder content (13-17% bitumen) and filler type. Modern international standards like EN 13813 are performance-based, specifying final properties (e.g., strength, resistance class) without dictating composition.
≠The Indian standard is specific to bitumen mastic. International standards for conductive flooring (e.g., IEC 61340 series) are material-agnostic, covering epoxy, vinyl, rubber, and other technologies alongside asphaltic systems.
≠IS 8374 specifies a fixed test voltage of 500V DC for resistance measurement. The modern international test standard, IEC 61340-4-1, specifies a lower voltage (10V or 100V) depending on the resistance range, which is considered more representative for ESD applications.
≠International standards like IEC 61340-5-1 consider the flooring as part of a 'system' including footwear, with requirements for 'resistance to ground' (Rg) and 'system resistance', which is a more holistic approach than the material-only focus of IS 8374.
Key Similarities
≈Both IS 8374 and its international counterparts have the same fundamental objective: to provide a flooring surface that controls static electricity to prevent ignition hazards or damage to sensitive equipment.
≈The primary performance characteristic in all related standards is the electrical resistance of the flooring surface, measured in Ohms (Ω), to ensure it is within a safe and effective range.
≈The underlying technology of adding a conductive filler (such as a special grade of carbon black specified in IS 8374) to an otherwise insulating binder (bitumen) is a common principle for products meeting these standards.
≈The basic principle of the electrical test is consistent: applying a voltage between two points on the floor or between the surface and ground and measuring the resulting electrical resistance.
Parameter Comparison
ParameterIS ValueInternationalSource
Electrical Resistance (Conducting Grade)2 x 10^4 to 1 x 10^6 ΩOverlaps with 'Conductive' (<10^5 Ω) and 'Dissipative' (10^5 to 10^9 Ω) ranges for flooring.IEC 61340-5-1:2016
Electrical Resistance (Anti-static Grade)1 x 10^5 to 1 x 10^8 ΩFits within the 'Static Dissipative' range (typically 10^5 Ω to <10^9 Ω for floors).IEC 61340-5-1:2016
Resistance Test Voltage500 V DC10 V DC (for R < 10^6 Ω) or 100 V DC (for R ≥ 10^6 Ω).IEC 61340-4-1
Binder Content13.0 to 17.0 percent by mass (85/25 grade industrial bitumen)Not specified; composition is determined by the manufacturer to meet performance requirements.BS EN 13813:2002
HardnessIndentation at 25°C not more than 1.5 mmNot directly comparable. Uses performance classes for Compressive Strength (e.g., C25) and Wear Resistance (e.g., AR1).BS EN 13813:2002
Mineral Filler Content83.0 to 87.0 percent by massNot specified; performance-based.BS EN 13813:2002
⚠ Verify details from original standards before use

Key Values4

Quick Reference Values
Max electrical resistance for Conducting Grade1 x 10^5 ohms
Electrical resistance range for Anti-static Grade1 x 10^5 to 2 x 10^7 ohms
Hardness Indentation at 25°C (150N load, 60s)1.0 to 3.0 mm
Softening Point of Mastic (R&B Method)80 to 100 °C

Tables & Referenced Sections

Key Tables
Table 1 - Physical Requirements of Bitumen Mastic for Flooring
Table 2 - Requirements for Electrical Resistance
Key Clauses
Clause 3 - Constituents
Clause 4 - Physical Requirements
Clause 5 - Electrical Resistance
Clause 7 - Tests

Related Resources on InfraLens

Cross-Referenced Codes
IS 73:2013Paving Bitumen - Specification
→
IS 1205:1978Methods for testing tar and bitumen: Determin...
→
IS 1208:1978Methods for testing tar and bitumen: Determin...
→
IS 334:2002Glossary of Terms Relating to Iron and Steel
→

Frequently Asked Questions3

What is the difference between anti-static and conducting grade flooring under this standard?+
Conducting grade has a very low electrical resistance (max 1x10^5 ohms) for rapid static dissipation. Anti-static grade has a controlled, higher resistance (1x10^5 to 2x10^7 ohms) to prevent static build-up while offering some protection from electric shock.
How is the electrical resistance of the mastic tested?+
As per Clause 7.3, it is measured using a megohmmeter with specified electrodes placed on the material surface at a set distance, typically 60 cm apart.
What are the main components of this bitumen mastic?+
It consists of a bituminous binder, fine mineral fillers (like limestone), and fine aggregates. For the electrically conducting grade, conductive materials like specific types of carbon black are added.

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