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IS 158:2008 is the Indian Standard (BIS) for ready mixed paint, brushing, bituminous, black, lead free, acid, alkali and heat resisting - specification. This standard specifies the requirements, sampling, and testing methods for ready-mixed, brushing-type, bituminous black paint. It is utilized by engineers to specify protective coatings for steel and concrete surfaces requiring high resistance to acids, alkalis, heat, and moisture, while ensuring the formulation is lead-free for safety and environmental compliance.
Specifies requirements and methods of test for ready mixed, brushing, bituminous, black, lead free, acid, alkali and heat resisting paint.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Painting, Coatings and Surface Finishing
! Bituminous paints have excellent chemical and moisture resistance but generally exhibit poor UV stability. They are best suited for interior, buried, or shaded applications where direct sunlight is minimal.
! Proper surface preparation, including the complete removal of rust, mill scale, and grease, is critical for the long-term adhesion of the coating.
! Ensure adequate ventilation during application in confined spaces due to solvent emissions.
BS 6949:1991BSI (British Standards Institution), United Kingdom
MediumWithdrawn
Bitumen-based coatings for cold application, excluding use with potable water
Covers general-purpose cold-applied bituminous coatings, similar to the base product in IS 158.
ASTM D4479 / D4479M - 19ASTM International, USA
LowCurrent
Standard Specification for Asphalt Roof Coatings - Asbestos-Free
Specifies a cold-applied bituminous (asphalt) coating, but its primary focus is roofing, not chemical or heat resistance.
SSPC-Paint 33SSPC (The Society for Protective Coatings) / AMPP, USA
LowCurrent
Coal Tar Emulsion Coating
Specifies a black protective coating, but is based on coal tar emulsion (water-based) rather than solvent-based bitumen.
Key Differences
≠IS 158:2008 explicitly requires and tests for high heat resistance (up to 250°C), which is a unique and primary feature not commonly found in general-purpose international bituminous paint standards like the historical BS 6949 or roofing-focused ASTM D4479.
≠The Indian Standard mandates specific chemical resistance tests against 5% sulphuric acid and 5% sodium hydroxide solutions. Most international equivalents for general or roofing use do not include these specific chemical resistance requirements.
≠While many regions restrict lead, IS 158:2008 places "Lead Free" in the title, making it a primary identifier of the product, with a defined limit of 90 ppm. International standards often rely on overarching regional regulations (like REACH or CPSIA) for lead restriction rather than embedding it in the product specification title.
Key Similarities
≈The fundamental composition is similar, based on a bituminous or asphaltic binder dissolved in a suitable solvent to create a ready-to-use black paint for cold application.
≈All standards specify requirements for drying time (e.g., surface dry, hard dry) to ensure the coating becomes functional within a practical timeframe.
≈They share common requirements for the physical properties of the dried film, such as having a smooth, uniform, black finish and passing a flexibility/adhesion test (bend test) to ensure it does not crack or peel.
≈All standards specify safety-related parameters, such as a minimum flash point, to ensure safe handling and application of the solvent-based product.
Parameter Comparison
Parameter
IS Value
International
Source
Heat Resistance
No blistering, wrinkling, or loss of adhesion after 30 min at 250°C.
Not specified; typically tested for sag or flow at lower temperatures (e.g., 60°C).
ASTM D4479 / D4479M - 19
Acid Resistance (24h immersion)
Unaffected by 5% Sulphuric Acid (H₂SO₄).
Not a requirement for a standard roofing coating.
ASTM D4479 / D4479M - 19
Alkali Resistance (24h immersion)
Unaffected by 5% Sodium Hydroxide (NaOH).
Not a requirement for a standard roofing coating.
ASTM D4479 / D4479M - 19
Drying Time (Surface Dry)
Maximum 4 hours.
Maximum 6 hours (for Type 1).
BS 6949:1991
Flexibility and Adhesion (Bend Test)
Passes over a 6 mm mandrel.
Passes over a 12.7 mm (0.5 in) mandrel at 0°C.
ASTM D4479 / D4479M - 19
Flash Point (minimum)
30°C (Abel closed-cup).
32°C (Tag closed-cup).
BS 6949:1991
Lead Content
Maximum 90 ppm.
Generally restricted to <90 ppm by separate regulation (e.g., CPSIA), not always by the product standard itself.
ASTM D4479 / D4479M - 19
⚠ Verify details from original standards before use