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IS 12082:2000 (Part 2) is the Indian Standard (BIS) for control of asbestos emission - recommendations, part 2: milling of asbestos ore. 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
! 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.
Safety in the use of asbestos (Code of Practice)International Labour Organization (ILO), Switzerland
HighCurrent
Safety in the use of asbestos: An ILO code of practice
Provides comprehensive guidance on asbestos safety, including specific sections on mining and milling operations.
30 CFR Part 56/57Mine Safety and Health Administration (MSHA), USA
HighCurrent
Safety and Health Standards for Surface/Underground Metal and Nonmetal Mines - §56.5001/§57.5001 Asbestos exposure limit
Directly regulates asbestos exposure, monitoring, and control measures within US mining operations.
Control of Asbestos Regulations 2012 (CAR 2012)Health and Safety Executive (HSE), United Kingdom
MediumCurrent
Control of Asbestos Regulations 2012
Sets modern control limits and work practices for asbestos, but its scope is abatement and management as mining is banned.
C162 - Asbestos Convention, 1986International Labour Organization (ILO), Switzerland
MediumCurrent
Convention concerning Safety in the Use of Asbestos
A high-level international treaty establishing principles for asbestos control, including a ban on crocidolite mining.
Key Differences
≠IS 12082 operates with a significantly higher permissible exposure limit (2.0 fibres/ml) compared to modern international standards like UK's CAR 2012 or US MSHA regulations, which mandate a much stricter limit of 0.1 fibres/cm³.
≠The Indian standard provides recommendations for active mining operations, a practice now banned in many countries whose standards (e.g., UK CAR 2012) have shifted focus entirely to management of existing asbestos and abatement.
≠International regulations like MSHA's have specific, mandatory requirements for regulated areas, comprehensive medical surveillance programs, and defined excursion limits, which are more detailed and stringent than the recommendations in IS 12082.
≠While IS 12082 is a recommendation, international equivalents like MSHA 30 CFR and UK CAR 2012 are legally binding regulations with direct enforcement and penalty provisions.
Key Similarities
≈All standards universally recommend or mandate the use of wet methods (e.g., wet drilling, wetting of ore) as the primary engineering control to suppress airborne asbestos fibres at the source.
≈There is a common requirement for regular environmental monitoring of airborne asbestos fibre concentrations in the workplace to verify the effectiveness of control measures.
≈All frameworks recognize the need for personal protective equipment (PPE), specifically respiratory protection, when engineering and work practice controls cannot reliably maintain exposure below the prescribed limits.
≈A fundamental similarity is the principle of worker health protection through medical surveillance, including pre-employment and periodic health examinations to detect early signs of asbestos-related diseases.
Parameter Comparison
Parameter
IS Value
International
Source
8-Hour Time-Weighted Average (TWA) Exposure Limit
2.0 fibres/ml (for chrysotile, as per referenced IS 11451)
0.1 fibres/cm³
MSHA 30 CFR 56.5001
Short-Term/Excursion Limit
Not specified in the standard.
1.0 fibres/cm³ averaged over 30 minutes
MSHA 30 CFR 56.5001
Primary Dust Control Method
Recommends wet drilling and spraying of water on muckpiles.
Mandates use of wet methods, enclosed systems, or ventilated systems as engineering controls.
ILO Safety in the use of asbestos (1984)
Air Monitoring Method
Phase Contrast Microscopy (PCM) as per IS 11450.
Phase Contrast Microscopy (PCM) via NIOSH Method 7400 or equivalent.
MSHA 30 CFR 56.5001
Medical Surveillance Requirement
Recommended, including periodical examination with chest X-ray.
Mandatory, including chest roentgenogram and pulmonary function tests, offered annually.
MSHA 30 CFR 56.5001
Waste Disposal
Waste should be wetted and transported in sealed, impermeable bags/containers to a designated disposal site.
Asbestos waste must be placed in sealed, labeled, impermeable containers and disposed of in a landfill approved for asbestos waste.
UK CAR 2012
Prohibition of Asbestos Types in Mining
The standard does not prohibit specific types, focusing on control measures (Note: Indian national policy later banned amphibole asbestos).
Prescribes that national laws should prohibit the mining of crocidolite.
ILO C162 - Asbestos Convention, 1986
⚠ Verify details from original standards before use
Key Values4
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
Tables & Referenced Sections
Key Tables
No tables data
Key Clauses
Clause 4 - General Recommendations
Clause 5 - Specific Recommendations for Emission Control
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.