IS 2524 (Part 2) : 2000Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

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ISO 12944-4 · ASTM D1730-09(2019) · ASTM D2092

CurrentSpecializedCode of PracticeArchitectural · Building Construction Practices incl. Painting, Varnishing

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IS 2524:2000 (Part 2) is the Indian Standard (BIS) for the painting of non-ferrous metals in buildings, part 2: painting. This standard provides guidelines and schedules for the painting of non-ferrous metals like aluminium, zinc, copper, and lead in buildings. It specifies the types of primers, undercoats, and finishing coats required to ensure proper adhesion, protection against corrosion, and aesthetic quality.

Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

Overview

Status: Current
Usage level: Specialized
Domain: Architectural — Building Construction Practices incl. Painting, Varnishing
Type: Code of Practice

International equivalents

ISO 12944-4:2017 · ISO (International Organization for Standardization)ASTM D1730-09(2019) · ASTM International (USA)ASTM D2092-20 · ASTM International (USA)ISO 9717:2017 · ISO (International Organization for Standardization)

Typically used with

IS 104 IS 2074 IS 2932

Also on InfraLens for IS 2524

2Key values 2Tables 3FAQs

Practical Notes

! Non-ferrous metals lack a adequate mechanical key; hence, proper pretreatment (as per Part 1) or the use of wash/etch primers is critical for paint adhesion.

! Copper and lead are typically only painted for decorative purposes or to prevent run-off staining on adjacent masonry, rather than for corrosion protection.

! Ensure surfaces are completely dry and free from grease, oil, or oxidation products before primer application.

Frequently referenced clauses

Cl. 4Selection of Paint System Cl. 5Painting on Aluminium Cl. 6Painting on Zinc Cl. 7Painting on Copper Cl. 8Painting on Lead

non-ferrous metalsaluminiumzinccopperleadpaintprimer

International Equivalents

Similar International Standards

ISO 12944-4:2017ISO (International Organization for Standardization)

HighCurrent

Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 4: Types of surface and surface preparation

Covers surface preparation for various substrates, including hot-dip galvanized steel (zinc) and aluminium, before painting.

ASTM D1730-09(2019)ASTM International (USA)

HighCurrent

Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting

Directly addresses the pretreatment of aluminum and its alloys, a major component of the IS code's scope.

ASTM D2092-20ASTM International (USA)

HighCurrent

Standard Guide for Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting

Focuses specifically on preparing zinc surfaces for painting, equivalent to the galvanizing section of IS 2524.

ISO 9717:2017ISO (International Organization for Standardization)

MediumCurrent

Phosphate conversion coatings for metals — Specification requirements

Details a specific chemical pretreatment method (phosphating) that is recommended as an option in IS 2524.

Key Differences

≠IS 2524 is largely prescriptive, providing specific chemical recipes (e.g., for 'T-Wash'). Modern international standards like ISO 12944 are more performance-based, specifying the required outcome (e.g., cleanliness level, coating weight) and allowing various methods to achieve it.

≠The Indian standard consolidates pretreatment for multiple non-ferrous metals (Al, Zn, Mg, Cu, Pb) into one document. International practice, particularly by ASTM, often dedicates separate, more detailed standards to each metal type (e.g., ASTM D1730 for Aluminum, ASTM D2092 for Zinc).

≠IS 2524:2000 still describes traditional chromate conversion processes without significant emphasis on environmental hazards. Contemporary international standards heavily restrict or discourage hexavalent chromate use and provide extensive guidance on chromate-free alternatives due to environmental and health regulations (e.g., REACH, RoHS).

≠International standards provide more specific and quantifiable definitions for surface cleanliness, often referencing other standards like ISO 8501-1 (e.g., Sa 2 ½). IS 2524 uses more qualitative descriptions like 'shall be free from oil, grease...'

Key Similarities

≈All standards universally emphasize the critical importance of the first step: thorough surface cleaning to remove contaminants like oil, grease, dirt, and loose oxides.

≈Both IS 2524 and its international counterparts recognize the validity of multiple pretreatment strategies, including mechanical methods (abrasion), chemical methods (etching, conversion coatings), and electrochemical methods (anodizing for aluminum).

≈The fundamental principle of creating a stable, inert, and micro-roughened surface to promote mechanical keying and chemical bonding of the paint film is a shared concept across all standards.

≈There is a common recommendation to apply the primer or first coat of paint as soon as possible after pretreatment to prevent re-oxidation or contamination of the activated surface.

Parameter Comparison

Parameter	IS Value	International	Source
Aluminium Etch Primer Acid	Phosphoric acid (sp gr 1.75) 20 to 25 ml in 1 litre of water.	Typically a two-component system where the acidic component contains 8-15% phosphoric acid by weight along with vinyl butyral resin.	SSPC Paint 27
Alkaline Chromate Treatment Temp. (Aluminium)	90-100°C for 5 minutes.	Common chromate conversion coatings are applied at or near ambient temperature (20-40°C) for 1-5 minutes.	ASTM B449 (Industry Practice)
Pretreatment for Zinc (Mordant Wash)	Prescribes a specific single-component formula containing phosphoric acid and copper carbonate ('T-Wash').	Recommends a two-component 'wash primer' system (e.g., conforming to SSPC Paint 27) or phosphating as per other standards.	ASTM D2092
Anodizing as Paint Base (Aluminium)	Recommends anodizing as per IS 1868, but does not specify a thickness or sealing requirement for painting.	Recommends an unsealed anodic film with a thickness of 5 to 8 micrometers (µm) for optimal paint adhesion.	ASTM D1730
Surface Cleanliness Standard	Qualitative: 'free from oil, grease, welding fluxes and other foreign matter'.	Quantitative: Specifies cleanliness grades by referencing other standards, e.g., 'Sa 2½' from ISO 8501-1 for abrasive blasting.	ISO 12944-4
Phosphating for Zinc	Recommends 'light' phosphate coatings without specifying coating weight.	Specifies coating mass per unit area, e.g., typically 1.1 to 11 g/m² depending on the class.	ISO 9717

⚠ Verify details from original standards before use

Key Values2

Quick Reference Values

recommended minimum finish coats2 coats

minimum primer coats1 coat

Tables & Referenced Sections

Key Tables

Table 1 - Painting Schedule for Aluminium

Table 2 - Painting Schedule for Zinc

Key Clauses

Clause 4 - Selection of Paint System

Clause 5 - Painting on Aluminium

Clause 6 - Painting on Zinc

Clause 7 - Painting on Copper

Clause 8 - Painting on Lead

Frequently Asked Questions3

What type of primer is recommended for aluminium surfaces?+

Zinc chromate primer conforming to IS 104 or a suitable wash/etch primer to ensure proper adhesion.

Is painting mandatory for copper or lead in buildings?+

No, they possess high natural corrosion resistance. Painting is done primarily for decorative purposes or to prevent green staining on adjacent surfaces.

What is the primary challenge when painting non-ferrous metals?+

Poor paint adhesion due to their smooth surface characteristics and lack of mechanical key.

QA/QC Inspection Templates

📋

QA/QC templates coming soon for this code.

Browse all 300 templates →

IS 2524 (Part 2) : 2000Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

PDF Google Compare BIS Portal

Link points to Internet Archive / others. Not hosted by InfraLens. Details

ISO 12944-4 · ASTM D1730-09(2019) · ASTM D2092

CurrentSpecializedCode of PracticeArchitectural · Building Construction Practices incl. Painting, Varnishing

PDF Google Compare BIS Portal

Link points to Internet Archive / others. Not hosted by InfraLens. Details

Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

Overview

Status: Current
Usage level: Specialized
Domain: Architectural — Building Construction Practices incl. Painting, Varnishing
Type: Code of Practice

International equivalents

Typically used with

IS 104 IS 2074 IS 2932

Also on InfraLens for IS 2524

2Key values 2Tables 3FAQs

Practical Notes

! Non-ferrous metals lack a adequate mechanical key; hence, proper pretreatment (as per Part 1) or the use of wash/etch primers is critical for paint adhesion.

! Copper and lead are typically only painted for decorative purposes or to prevent run-off staining on adjacent masonry, rather than for corrosion protection.

! Ensure surfaces are completely dry and free from grease, oil, or oxidation products before primer application.

Frequently referenced clauses

Cl. 4Selection of Paint System Cl. 5Painting on Aluminium Cl. 6Painting on Zinc Cl. 7Painting on Copper Cl. 8Painting on Lead

non-ferrous metalsaluminiumzinccopperleadpaintprimer

International Equivalents

Similar International Standards

ISO 12944-4:2017ISO (International Organization for Standardization)

HighCurrent

Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 4: Types of surface and surface preparation

Covers surface preparation for various substrates, including hot-dip galvanized steel (zinc) and aluminium, before painting.

ASTM D1730-09(2019)ASTM International (USA)

HighCurrent

Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting

Directly addresses the pretreatment of aluminum and its alloys, a major component of the IS code's scope.

ASTM D2092-20ASTM International (USA)

HighCurrent

Standard Guide for Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting

Focuses specifically on preparing zinc surfaces for painting, equivalent to the galvanizing section of IS 2524.

ISO 9717:2017ISO (International Organization for Standardization)

MediumCurrent

Phosphate conversion coatings for metals — Specification requirements

Details a specific chemical pretreatment method (phosphating) that is recommended as an option in IS 2524.

Key Differences

Key Similarities

≈All standards universally emphasize the critical importance of the first step: thorough surface cleaning to remove contaminants like oil, grease, dirt, and loose oxides.

≈The fundamental principle of creating a stable, inert, and micro-roughened surface to promote mechanical keying and chemical bonding of the paint film is a shared concept across all standards.

≈There is a common recommendation to apply the primer or first coat of paint as soon as possible after pretreatment to prevent re-oxidation or contamination of the activated surface.

Parameter Comparison

Parameter	IS Value	International	Source
Aluminium Etch Primer Acid	Phosphoric acid (sp gr 1.75) 20 to 25 ml in 1 litre of water.	Typically a two-component system where the acidic component contains 8-15% phosphoric acid by weight along with vinyl butyral resin.	SSPC Paint 27
Alkaline Chromate Treatment Temp. (Aluminium)	90-100°C for 5 minutes.	Common chromate conversion coatings are applied at or near ambient temperature (20-40°C) for 1-5 minutes.	ASTM B449 (Industry Practice)
Pretreatment for Zinc (Mordant Wash)	Prescribes a specific single-component formula containing phosphoric acid and copper carbonate ('T-Wash').	Recommends a two-component 'wash primer' system (e.g., conforming to SSPC Paint 27) or phosphating as per other standards.	ASTM D2092
Anodizing as Paint Base (Aluminium)	Recommends anodizing as per IS 1868, but does not specify a thickness or sealing requirement for painting.	Recommends an unsealed anodic film with a thickness of 5 to 8 micrometers (µm) for optimal paint adhesion.	ASTM D1730
Surface Cleanliness Standard	Qualitative: 'free from oil, grease, welding fluxes and other foreign matter'.	Quantitative: Specifies cleanliness grades by referencing other standards, e.g., 'Sa 2½' from ISO 8501-1 for abrasive blasting.	ISO 12944-4
Phosphating for Zinc	Recommends 'light' phosphate coatings without specifying coating weight.	Specifies coating mass per unit area, e.g., typically 1.1 to 11 g/m² depending on the class.	ISO 9717

⚠ Verify details from original standards before use

Key Values2

Quick Reference Values

recommended minimum finish coats2 coats

minimum primer coats1 coat

Tables & Referenced Sections

Key Tables

Table 1 - Painting Schedule for Aluminium

Table 2 - Painting Schedule for Zinc

Key Clauses

Clause 4 - Selection of Paint System

Clause 5 - Painting on Aluminium

Clause 6 - Painting on Zinc

Clause 7 - Painting on Copper

Clause 8 - Painting on Lead

Frequently Asked Questions3

What type of primer is recommended for aluminium surfaces?+

Zinc chromate primer conforming to IS 104 or a suitable wash/etch primer to ensure proper adhesion.

Is painting mandatory for copper or lead in buildings?+

No, they possess high natural corrosion resistance. Painting is done primarily for decorative purposes or to prevent green staining on adjacent surfaces.

What is the primary challenge when painting non-ferrous metals?+

Poor paint adhesion due to their smooth surface characteristics and lack of mechanical key.

QA/QC Inspection Templates

📋

QA/QC templates coming soon for this code.

Browse all 300 templates →

IS 2524 (Part 2) : 2000Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

Overview

International Equivalents

Key Values2

Tables & Referenced Sections

Related Resources on InfraLens

Frequently Asked Questions3

QA/QC Inspection Templates

IS 2524 (Part 2) : 2000Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

Overview

International Equivalents

Key Values2

Tables & Referenced Sections

Related Resources on InfraLens

Frequently Asked Questions3

QA/QC Inspection Templates