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.

IS 8374

: 1977

Bitumen Mastic, Anti-Static and Electrically Conducting Grade

CurrentSpecializedSpecificationBIMMaterials Science · Flooring, Wall Finishing and Roofing

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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

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

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.