ASTM D7089 Determination of the Effectiveness of Anti-Graffiti Coating by Pressure Washing on Concrete, Masonry and Natural Stone Surfaces

The American Society for Testing and Materials (ASTM) standard, "ASTM D7089 Standard Practice for Determining the Effectiveness of Anti-Graffiti Coatings by Pressure Washing on Concrete, Masonry, and Natural Stone Surfaces," describes a basic method for evaluating the performance of anti-graffiti products on mineral structural surfaces using a series of increasingly abrasive cleaning methods. Anti-graffiti materials are applied to a series of concrete, masonry, and natural stone samples for evaluation. Graffiti resistance is based on how well a defined set of markings is removed using a specific set of cleaning techniques.

This application also describes a procedure for evaluating graffiti removal after re-marking and subsequent re-cleaning. It does not address the re-treatment of surfaces after a material has ceased to resist graffiti.

Graffiti on buildings and structures is a significant problem in various areas across the country. Various coatings have been developed to resist or aid in removal of paint/pencil applications. This standard describes a procedure for evaluating the effectiveness of anti-graffiti coatings applied to various concrete, masonry, and natural stone surfaces. This standard does not address graffiti removal on metal or other non-mineral surfaces.

This practice addresses graffiti removal from surfaces that have not been exposed to natural or artificial weathering in a laboratory setting only. ASTM D6578/D6578M Standard Practice for Determining Graffiti Resistance includes a method for graffiti removal after exposure to both natural and artificial weathering.

ASTM D7089 outlines laboratory procedures for evaluating the performance of anti-graffiti coatings when cleaned using pressure-washing methods on mineral surfaces (i.e., concrete, masonry, and natural stone). These procedures do not apply to metal or other non-mineral surfaces.

Before testing, treated surface samples are marked with spray paint or markers. Cleaning is accomplished by a series of increasingly aggressive pressure washing methods. First, cold, high-pressure water washes with a commercial graffiti remover, followed by hot, high-pressure water washes, and finally, high-pressure sodium bicarbonate washes.

The degree of graffiti removal is determined quantitatively. For example, "Cleanability level 1" indicates complete removal in all samples.

Coating types are classified as follows:

• Non-sacrificial coatings: Remain intact after graffiti removal.
• Sacrificial coatings: Removed or damaged during cleaning and must be reapplied.

This standard includes procedures for re-marking surfaces and re-evaluating removal performance over multiple cycles.

Tests are performed on new, unweathered surfaces under laboratory conditions. No aging or environmental degradation is considered. In this case, the ASTM D6578/D6578M standard method applies.

In summary, the ASTM D7089 standard test methods are:

• Surface preparation: Mineral surfaces are cleaned, labeled and coated.
• Graffiti application: Spray paint or felt-tip pen is applied and waited for it to dry.
• Step 1: Cleaning: Use cold water and graffiti remover.
• Step 2 cleaning: Hot high pressure water is used.
• Step 3 cleaning: Spray with sodium bicarbonate (if necessary).
• Cleanability assessment: The rate of graffiti removed is determined (Levels 1-4).
• Re-cleaning cycles: The graffiti is reapplied and the cleaning is repeated.
• Final evaluation: Coating performance and durability are documented after repeated cleanings.

The cleanability rating system is as follows:

• Level 1: 100 percent cleaning
• Level 2: 90-99 percent cleaning
• Level 3: 75-89 percent cleaning
• Level 4: Less than 75 percent cleanup

This rating is based on visual inspection and may be supported by photographic documentation.

The ASTM D7089 standard is important because it provides a scientific, consistent, and repeatable way to evaluate the effectiveness of anti-graffiti coatings, particularly on concrete, masonry, and stone surfaces. This standard is considered important for the following reasons:

• Provides objective performance evaluation: Without ASTM D7089 or a similar standard, it is difficult to fairly compare anti-graffiti products. This standard establishes clear and repeatable procedures for:
  • Graffiti application
  • Surface cleaning
  • Measuring how much graffiti has been removed

This eliminates guesswork and marketing bias when comparing coatings.

• Supports product development and innovation: Manufacturers use the ASTM D7089 standard for the following purposes:
  • Testing new coatings under consistent conditions
  • To increase durability or cleanability
  • Providing industry-recognized and reliable performance data
• Helps cities and facility managers choose the right coatings: Public agencies, building owners, and maintenance crews often deal with graffiti in:
  • Public transport stations
  • Public buildings
  • Historical stonework
  • Concrete walls

The ASTM D7089 standard helps ensure that coatings:

• Suitable for surface type
• Can be cleaned repeatedly without causing damage
• Reduces long-term maintenance costs

• Can the coating withstand several cleanings?
• Does it continue to protect the surface over time?

This is crucial for cost-effectiveness.

• Promotes infrastructure longevity: Graffiti removal can damage untreated surfaces. Coatings that pass ASTM D7089:
  • Reduces surface erosion from excessive cleaning
  • Protects structural materials such as stone or concrete
  • Avoids costly repairs or replacements
• Ensures regulatory compliance: Some government agencies may require compliance with ASTM D7089 when specifying materials or awarding contracts. This standard provides a maintenance standard that can be specified in procurement documents or maintenance instructions.

Ultimately, the ASTM D7089 standard is important because it ensures that anti-graffiti coatings perform reliably, safely and sustainably as claimed, saving time and money while protecting infrastructure.

Our organization, which has been operating for many years and meticulously follows global developments in science and technology, employs a skilled team and extensive infrastructure to conduct testing, measurement, and analysis in a wide range of areas for businesses across all sectors. In this context, we also provide testing services in accordance with ASTM D7089 Standard Practice for Determining the Effectiveness of Anti-Graffiti Coatings by Pressure Washing on Concrete, Masonry, and Natural Stone Surfaces.