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ASTM D5589
Standard for Determining the resistance of Paint Films and related Coatings to Algal Defacement
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ASTM D5589: 2009 - Standard for Determining the resistance of Paint Films and related Coatings to Algal Defacement
Application
Mandatory test strains
- Isolated wild strains or those recommended by the client will be used for testing.
- Coating samples are applied to a substrate, dried, and inoculated with an algae suspension on Allen's agar plates. Plates are incubated under controlled conditions of humidity, temperature, and light/dark cycles. Growth is monitored weekly for three weeks.
- Identifies paints and coatings susceptibility to algal growth.
- Assists in improving product durability and aesthetics.
Turnaround Time
Passing criteria
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Abstract
ASTM D5589 describes the test method to assess the durability of paint films and coatings to algal defacement. Algal defacement is mainly attributed to environmental factors like temperature fluctuations, moisture changes, and the composition of the coatings themselves. ASTM D5589 helps in the evaluation of the relative performance of paint films and coating under a given set of conditions.
The anti-algal resistance of the coating sample is evaluated on a test substrate. A thin, even coating of samples is applied to the test substrate, and it is allowed to dry out for specific time periods before testing.
ASTM D5589 Test Method
- Coating samples to be tested are placed in the center of solidified Allen’s agar plates.
- Using a sterile atomizer or chromatography sprayer, a thin coat of algae suspension is sprayed onto each specimen, ensuring the proper coverage of the surface without oversaturating it.
- Inoculated plates are transferred to an incubator with a constant fluorescent light source and other parameters such as humidity ≥ 85 % and temperature of 25 ± 2°C. A cycle of 14 hours of light followed by 10 hours of darkness is conducive to the growth of the algae.
- Plates are examined weekly for Algae growth.
- Weekly Algae growth on specimens is assessed over a three-week period, and the ratings are as follows:
Evaluation of Algae growth after three weeks (Results)
Observed Growth on Specimens | Rating |
None | 0 |
Traces of growth (<10 %) | 1 |
Light growth (10–30 %) | 2 |
Moderate growth (30–60 %) | 3 |
Heavy growth (60 % to complete coverage) | 4 |
Importance of ASTM D5589 Test
Paint film and coatings are susceptible to algal defacement under specific conditions that offer a favorable substrate for algal growth. Various elements, such as environmental factors, lighting, temperature, and substrate composition, play crucial roles in facilitating algal colonization. Consequently, this results in undesirable discoloration, reduced aesthetic appeal, and even the potential deterioration of the film or coating over time.
To address this concern,the ASTM D5589 method has been developed for the purpose of assessing the resistance of paint or coating films to algae growth within controlled laboratory environments.
Conclusion
Are you looking for ASTM D5589 testing for your product samples? Look no further! The experts at MIS will be happy to assist you.
MIS offers a comprehensive range of antialgal testing services catering to different industries engaged in the innovation and manufacturing of disinfectants, paints/coatings, plastics, and textiles. Backed by a cutting-edge laboratory setup and a team of experts, we ensure accuracy and reliability in our services.
Furthermore, customers can also send us their product samples for ASTM D5590 testing.
To get a quote on ASTM D5589 test or want to know more about our antialgal testing services, contact our experts now.
Frequently Asked Questions
DR. Martinoz Scholtz
ASTM D5589 test is designed to evaluate the resistance of paint films and coating materials to Algae defacement under ca ertain set of conditions.
ASTM D5589 test is applicable to paint films and coatings materials.
ASTM D5589 test takes 4-5 weeks to complete.
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