What is the primary method for controlling asbestos dust during milling?

Enclosing all dust-generating operations and using local exhaust ventilation (LEV) to capture dust at the source, which is then passed through a dust collector (Clause 5).

What exposure limit should be followed?

The code recommends adhering to the statutory limit defined in the Factories Act, which is a Time Weighted Average (TWA) of 2 fibres per cubic centimetre (cm³).

Is Personal Protective Equipment (PPE) sufficient protection?

No, PPE is the last line of defence. The primary focus must be on engineering controls (enclosure, ventilation) to minimize dust generation in the first place (Clause 7).

What type of filter is recommended for dust collection?

High-efficiency bag filters are recommended, and for final air discharge, a High-Efficiency Particulate Air (HEPA) filter should be used.

IS 12082

: 2000

Control of Asbestos Emission - Recommendations, Part 2: Milling of Asbestos Ore

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This standard provides recommendations for controlling asbestos fibre emissions during the milling of asbestos ore. It focuses on engineering controls, work practices, and monitoring to protect worker health and prevent environmental contamination.

Control of Asbestos Emission - Recommendations, Part 2: Milling of Asbestos Ore

Quick Reference Values

Statutory Time Weighted Average (TWA) Exposure Limit2 fibres/cm³

Recommended Minimum Capture Velocity for Local Exhaust Hoods1.0 m/s

HEPA Filter Efficiency for Dust Collectors99.97% for 0.3 micron particles

Pressure in Enclosures relative to ambient-5 mm of water gauge

Practical Notes

The core principle is 'enclosure and extraction'; all dust-generating processes like crushing, screening, and bagging must be fully enclosed and connected to a dust extraction system.

Regular air monitoring and health surveillance of workers are critical requirements emphasized by this code, forming a key part of the safety management system.

Due to severe health risks and subsequent regulations, asbestos milling is rare. This code is primarily relevant for decommissioning, legacy site management, or in jurisdictions where milling might still occur under strict control.