ASTM D4610-98(2021)
(Guide)Standard Guide for Determining the Presence of and Removing Microbial (Fungal or Algal) Growth on Paint and Related Coatings
Standard Guide for Determining the Presence of and Removing Microbial (Fungal or Algal) Growth on Paint and Related Coatings
SIGNIFICANCE AND USE
3.1 Microbial growth is a major cause of discoloration and deterioration of paint films. This guide describes techniques used to distinguish fungi and algae from other surface contaminants.
3.2 Repainting a surface contaminated with fungi or algae generally causes more rapid infestation of the new paint than repainting a surface from which fungal or algal growth has been removed. In addition, poor adhesion, staining/bleeding, and many other problems may result. This guide describes methods for removing fungal or algal growth prior to repainting.
Note 1: It is extremely important that all steps and notes be read and followed. In particular the washing steps outlined in 5.2.2 and 5.2.4 must be fully carried out, since residual sodium hypochlorite (bleach) can cause many of the same problems, or even loss of coloration after repainting, and residual phosphate detergents can encourage further fungal and algal growth.
Note 2: This procedure is intended for use when recoating the surface. Reports of using this procedure to remove fungi and algae without recoating necessitate inclusion of a warning about the adverse effects of bleach on a coating film. The oxidative effects of bleach can degrade film properties, including particularly the “bleaching” (loss of color) in films containing organic coloring pigments (such as quinacridones, etc.), loss of gloss, chalking, etc. A small patch must be tested prior to use of this procedure for that purpose.
SCOPE
1.1 This guide describes techniques used for determining the presence of fungal or algal growth on paint and related coatings and methods for removal of such growth prior to recoating.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Oct-2021
- Technical Committee
- D01 - Paint and Related Coatings, Materials, and Applications
- Drafting Committee
- D01.28 - Biodeterioration
Relations
- Effective Date
- 01-Jul-2016
- Effective Date
- 01-Oct-2013
- Effective Date
- 01-Mar-2009
- Effective Date
- 01-Mar-2009
- Effective Date
- 01-Jul-2008
- Effective Date
- 15-Apr-1995
- Effective Date
- 01-Jan-1995
- Effective Date
- 01-Jan-1995
- Effective Date
- 26-May-1989
Overview
ASTM D4610-98(2021) is a widely recognized standard guide from ASTM International focused on the identification and removal of microbial growth, specifically fungal and algal contamination, on paint and related coatings. Microbial growth on surfaces is a major concern as it leads to discoloration, deterioration, poor adhesion, and other painting issues. The guide provides practical, step-by-step procedures to distinguish and safely remove these contaminants, ensuring optimal results when recoating surfaces.
By following ASTM D4610, stakeholders in painting and building maintenance can achieve longer-lasting, visually appealing coatings while minimizing rapid reinfestation and costly failures.
Key Topics
Detection Techniques
The standard outlines methods for determining the presence of fungal or algal growth, differentiating them from dirt or other surface contaminants. Techniques include:- Chemical identification using a sodium hypochlorite (household bleach) test
- Visual inspection under magnification
- Microbiological subculture methods
Best Practices for Removal
ASTM D4610 details essential steps for effective removal, which significantly reduces the risk of recurring microbial growth:- Washing with a phosphate-free detergent
- Treatment with diluted sodium hypochlorite
- Thorough rinsing between steps to prevent chemical residues
- Verification of cleanliness before recoating
Safety and Environmental Considerations
The guide highlights the importance of:- Proper PPE (Personal Protective Equipment)
- Protecting adjacent surfaces and vegetation from overspray
- Avoiding residual chemicals that may interfere with paint adhesion or performance
- Testing a small patch before large-scale use, particularly when bleach is involved
Applications
Adhering to ASTM D4610 is particularly valuable in the following scenarios:
Surface Preparation for Painting
Contractors, facilities managers, and maintenance professionals use this guide to ensure thorough microbial removal before repainting, which prevents rapid re-infestation and maximizes new coating durability.Building Restoration and Renovation
In restoration projects, especially for exterior walls and historical buildings affected by mold or algae, this standard helps preserve structural integrity and aesthetic value.Routine Maintenance
Organizations involved in routine upkeep of public, commercial, or residential properties benefit from consistent procedures to assess and address microbial contamination on painted surfaces.Quality Assurance
Manufacturers or service providers looking to meet industry best practices and customer requirements for surface cleanliness often reference ASTM D4610 procedures.
Related Standards
Understanding ASTM D4610 in context is enhanced by familiarity with these related standards:
ASTM D2022
Test Methods of Sampling and Chemical Analysis of Chlorine-Containing Bleaches – for verifying bleach concentration and properties.ASTM D3274
Test Method for Evaluating Degree of Surface Disfigurement of Paint Films by Fungal or Algal Growth, or Soil and Dirt Accumulation – for standardized assessment of microbial contamination.International Standardization Principles
ASTM D4610 aligns with the World Trade Organization’s TBT Committee principles, ensuring global applicability and harmonization in paint and coatings maintenance.
Keywords: ASTM D4610, microbial growth, fungal contamination, algal growth, paint coatings, surface preparation, bleach cleaning, phosphate-free detergent, recoating, building maintenance, painting standards, ASTM International.
Frequently Asked Questions
ASTM D4610-98(2021) is a guide published by ASTM International. Its full title is "Standard Guide for Determining the Presence of and Removing Microbial (Fungal or Algal) Growth on Paint and Related Coatings". This standard covers: SIGNIFICANCE AND USE 3.1 Microbial growth is a major cause of discoloration and deterioration of paint films. This guide describes techniques used to distinguish fungi and algae from other surface contaminants. 3.2 Repainting a surface contaminated with fungi or algae generally causes more rapid infestation of the new paint than repainting a surface from which fungal or algal growth has been removed. In addition, poor adhesion, staining/bleeding, and many other problems may result. This guide describes methods for removing fungal or algal growth prior to repainting. Note 1: It is extremely important that all steps and notes be read and followed. In particular the washing steps outlined in 5.2.2 and 5.2.4 must be fully carried out, since residual sodium hypochlorite (bleach) can cause many of the same problems, or even loss of coloration after repainting, and residual phosphate detergents can encourage further fungal and algal growth. Note 2: This procedure is intended for use when recoating the surface. Reports of using this procedure to remove fungi and algae without recoating necessitate inclusion of a warning about the adverse effects of bleach on a coating film. The oxidative effects of bleach can degrade film properties, including particularly the “bleaching” (loss of color) in films containing organic coloring pigments (such as quinacridones, etc.), loss of gloss, chalking, etc. A small patch must be tested prior to use of this procedure for that purpose. SCOPE 1.1 This guide describes techniques used for determining the presence of fungal or algal growth on paint and related coatings and methods for removal of such growth prior to recoating. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
SIGNIFICANCE AND USE 3.1 Microbial growth is a major cause of discoloration and deterioration of paint films. This guide describes techniques used to distinguish fungi and algae from other surface contaminants. 3.2 Repainting a surface contaminated with fungi or algae generally causes more rapid infestation of the new paint than repainting a surface from which fungal or algal growth has been removed. In addition, poor adhesion, staining/bleeding, and many other problems may result. This guide describes methods for removing fungal or algal growth prior to repainting. Note 1: It is extremely important that all steps and notes be read and followed. In particular the washing steps outlined in 5.2.2 and 5.2.4 must be fully carried out, since residual sodium hypochlorite (bleach) can cause many of the same problems, or even loss of coloration after repainting, and residual phosphate detergents can encourage further fungal and algal growth. Note 2: This procedure is intended for use when recoating the surface. Reports of using this procedure to remove fungi and algae without recoating necessitate inclusion of a warning about the adverse effects of bleach on a coating film. The oxidative effects of bleach can degrade film properties, including particularly the “bleaching” (loss of color) in films containing organic coloring pigments (such as quinacridones, etc.), loss of gloss, chalking, etc. A small patch must be tested prior to use of this procedure for that purpose. SCOPE 1.1 This guide describes techniques used for determining the presence of fungal or algal growth on paint and related coatings and methods for removal of such growth prior to recoating. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D4610-98(2021) is classified under the following ICS (International Classification for Standards) categories: 87.040 - Paints and varnishes. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D4610-98(2021) has the following relationships with other standards: It is inter standard links to ASTM D2022-89(2016), ASTM D3274-09(2013), ASTM D3274-09e1, ASTM D3274-09, ASTM D2022-89(2008), ASTM D3274-95(2002), ASTM D3274-95, ASTM D2022-89(1995)e1, ASTM D2022-89(2003). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D4610-98(2021) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D4610 − 98 (Reapproved 2021)
Standard Guide for
Determining the Presence of and Removing Microbial
(Fungal or Algal) Growth on Paint and Related Coatings
This standard is issued under the fixed designation D4610; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Repainting a surface contaminated with fungi or algae
generally causes more rapid infestation of the new paint than
1.1 This guide describes techniques used for determining
repainting a surface from which fungal or algal growth has
the presence of fungal or algal growth on paint and related
been removed. In addition, poor adhesion, staining/bleeding,
coatings and methods for removal of such growth prior to
and many other problems may result. This guide describes
recoating.
methods for removing fungal or algal growth prior to repaint-
1.2 The values stated in SI units are to be regarded as the
ing.
standard. The values given in parentheses are for information
NOTE 1—It is extremely important that all steps and notes be read and
only.
followed. In particular the washing steps outlined in 5.2.2 and 5.2.4 must
1.3 This standard does not purport to address all of the befullycarriedout,sinceresidualsodiumhypochlorite(bleach)cancause
many of the same problems, or even loss of coloration after repainting,
safety concerns, if any, associated with its use. It is the
and residual phosphate detergents can encourage further fungal and algal
responsibility of the user of this standard to establish appro-
growth.
priate safety, health, and environmental practices and deter-
NOTE2—Thisprocedureisintendedforusewhenrecoatingthesurface.
mine the applicability of regulatory limitations prior to use.
Reports of using this procedure to remove fungi and algae without
1.4 This international standard was developed in accor- recoating necessitate inclusion of a warning about the adverse effects of
bleach on a coating film. The oxidative effects of bleach can degrade film
dance with internationally recognized principles on standard-
properties, including particularly the “bleaching” (loss of color) in films
ization established in the Decision on Principles for the
containingorganiccoloringpigments(suchasquinacridones,etc.),lossof
Development of International Standards, Guides and Recom-
gloss, chalking, etc. A small patch must be tested prior to use of this
mendations issued by the World Trade Organization Technical
procedure for that purpose.
Barriers to Trade (TBT) Committee.
4. Reagents
2. Referenced Documents
4.1 Sodium Hypochlorite, approximately 5 % aqueous
(NaOCl) as commercial household bleach. Because sodium
2.1 ASTM Standards:
hypochlorite decomposes on exposure to heat and sunlight and
D2022Test Methods of Sampling and ChemicalAnalysis of
becomesineffective,useonlyfreshmaterial.SeeTestMethods
Chlorine-Containing Bleaches
D3274Test Method for Evaluating Degree of Surface Dis- D2022 for methods of sampling and chemical analysis.
figurement of Paint Films by Fungal or Algal Growth, or
4.2 Phosphate-Free, non-ammonia-containing detergent or
Soil and Dirt Accumulation
commercial cleaner recommended for washing paint.
3. Significance and Use
5. Procedures
3.1 Microbial growth is a major cause of discoloration and
5.1 DeterminingthePresenceofFungalorAlgalGrowthon
deterioration of paint films. This guide describes techniques
Paint:
used to distinguish fungi and algae from other surface con-
5.1.1 Chemical—Apply a drop of 5% aqueous sodium
taminants.
hypochlorite solution (common household bleach) to the area
suspected of being contaminated with fungal or algal growth.
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
Fungal or algal discoloration will normally bleach within 60 s.
Related Coatings, Materials, and Applications and is the direct responsibility of
Discoloration that does not bleach is probably dirt. For further
Subcommittee D01.28
...
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