Quick Insights
- AATCC 100 is a quantitative test method to measure antibacterial activity of treated textile materials
- Applicable to hydrophilic textile materials such as fabrics, apparel, home textiles, and medical textiles, home furnishings and so on.
- To substantiate antimicrobial claims of hydrophobic textile materials, a suitable test standard is ASTM E2149.
- Evaluates reduction of bacteria on antibacterial fabric (treated) vs untreated fabric ( control) after a defined contact period
- AATCC 100 is one of the widely accepted and used test methods for supporting product development, compliance, and antimicrobial marketing claims.
Summary
AATCC 100 is a widely recognized quantitative test method used to evaluate the antibacterial performance of textile materials. This antibacterial textile testing method helps textile manufacturers to validate antimicrobial claims by measuring bacterial reduction on treated fabrics vs untreated fabric after a specified contact period. AATCC 100 is commonly used for a variety of textile materials including sportswear, medical textiles, hygiene products, home furnishings, and so on. AATCC 100 is a critical standard for textile manufacturers as test results help in making important product development decisions, antibacterial performance claims, wash durability evaluation, quality assurance, and market credibility before commercial launch.
What is AATCC 100 Testing?
AATCC 100 is a quantitative antibacterial test method used to evaluate the antimicrobial effectiveness of textile materials treated with antibacterial agents.
What does AATCC 100 testing measure ?
- Bacterial reduction percentage – Compares bacterial reduction on treated sample against bacterial reduction on untreated samples after being challenged against same microbes
- Antimicrobial performance after contact time – Antibacterial textile testing evaluates how effectively an antimicrobial textile performs once inoculated with test strains for a defined incubation period.
- Efficacy against selected strains/ intended application area – It measures effectiveness of treated textiles against mandatory test strains such as Staphylococcus aureus (ATCC 6538P) and Klebsiella pneumoniae (ATCC 4352) to understand how product will perform under intended use areas. Additional strains as per customer request.
How Antibacterial Reduction Is Calculated
AATCC 100 test method is used to assess both bacteriostatic (inhibition of bacterial growth) and bactericidal (killing of bacteria) properties of the antibacterial textile materials.
In AATCC 100 testing, antibacterial performance is determined by comparing the number of viable bacteria recovered from treated textiles with those recovered from untreated control samples or initial inoculum levels.
How the AATCC 100 Test Works – Step by step procedure
- Challenging test sample with bacteria – The textile sample is inoculated with a known concentration of bacterial suspension.
- Incubation of inoculated samples – The inoculated fabric is incubated for a specified duration to allow enough interaction between the bacteria and treated fabric. In parallel, a control test is run where untreated cloth samples (untreated fabric) are also challenged with test bacteria.
- Neutralization – Fabric samples are subjected to neutralization to stop further antimicrobial action.
- Microbial enumeration – Neutralized samples are plated and incubated to recover remaining viable bacteria.
- Calculation of bacterial reduction – After incubation, bacterial counts from treated and untreated samples are calculated and compared to calculate antibacterial reduction performance.
Read more – ASTM E2149 vs AATCC 100: Choosing the Right Antibacterial Textile Test
Which Bacteria Are Commonly Used in AATCC 100?
- Staphylococcus aureus (ATCC 6538P),
- Klebsiella pneumoniae (ATCC 4352)
- Other customer-specified organisms depending on intended use conditions
Which textile products can be tested under AATCC 100 test method ?
- Apparel
- Sportswear
- Medical and healthcare textiles
- Home furnishings
- Waddings
Difference Between AATCC 100 and AATCC 147
| Parameters | AATCC 100 | AATCC 147 |
| Test Type | Quantitative | Qualitative |
| Result interpretation | % log reduction | Zone of inhibition |
| Scope of products for testing | Hydrophilic or porous textile materials | Diffusible antimicrobials on treated textile surfaces |
| Best use | Antimicrobial claim substantiation | Preliminary antimicrobial screening |
Read more – AATCC 147 Antibacterial Activity Assessment of Textiles (Parallel Streak Method)
Difference between AATCC 100 and ASTM E2149
| Parameters | AATCC 100 | ASTM E2149 |
| Test principle | Static contact method | Dynamic shake flask method |
| Scope of products for testing | Hydrophilic and porous textile materials | Hydrophobic textile materials with non leaching antimicrobial agents |
| Mandatory test organisms | Escherichia coli (ATCC 25922) | Staphylococcus aureus (ATCC 25923), Klebsiella pneumoniae (ATCC 4352) |
| Result type | Quantitative | Quantitative |
Factors that can influence AATCC 100 Results
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Type of antimicrobial treatment
The antimicrobial chemistry used on the textile plays a major role in overall antibacterial performance. Different technologies such as silver-based systems, quaternary ammonium compounds, zinc technologies, polymeric antimicrobials, or bio-based treatments exhibit different mechanisms of action, durability properties, and efficacy to kill bacterial load.
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Fabric composition
Fabric composition is another essential factor in determining product performance during antibacterial textile testing. The reason is textile substrate properties such as natural fibers, synthetic fibers, blended fabrics, coated materials, and nonwoven textiles may interact differently with antimicrobial treatments.
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Washing durability
Repeated laundering is one of the most important factors affecting long-term antibacterial performance. Some antimicrobial finishes may gradually lose effectiveness after washing due to chemical leaching, poor bonding, or surface wear.
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Contact time
Antibacterial activity of textile products also depends on the duration of contact between bacteria and the treated textile materials. Some antimicrobial technologies act quickly, while others require longer interaction periods to achieve higher bacterial reduction levels.
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Inoculum concentration used for testing
Microbial load introduced onto the textile sample can have a big impact on antibacterial performance of textiles. Higher microbial loads can make it more difficult for treated fabric to reduce bacterial growth effectively, ultimately giving misleading test results data.
Therefore, standardized inoculum concentrations are important for obtaining reproducible and reliable AATCC 100 test results.
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Sample handling
Improper sample handling before testing increases contamination risks and can also weaken antimicrobial efficacy.
Why is AATCC 100 important for textile manufacturers?
- Supports antimicrobial product claims – AATCC 100 testing helps manufacturers validate and support the antibacterial or antimicrobial claims for their products
- Helps in product optimization during development phases – AATCC 100 plays an important role during textile research and development by helping manufacturers evaluate and optimize antimicrobial finishing technologies.
- Builds customer and brand confidence – Rigorously tested and validated products have strong data on efficacy claims which help to build customer confidence and improve brand credibility in competitive textile markets.
- Supports compliance and regulatory requirements – Textiles claiming antimicrobial efficacy are facing major scrutiny from retailers, regulatory authorities, and consumers. Therefore, manufacturers are expected to support their product performance claims with credible test results data. AATCC 100 is a standardized test method that helps to demonstrate antibacterial efficacy claims under defined test conditions.
Future trends in antimicrobial textile technologies
- Sustainable antimicrobial textile technologies – In recent years, there is a big shift from using chemical based antimicrobial textile technologies to sustainable antimicrobial solutions. Textile manufacturers are exploring bio-based, non-toxic, green nanotechnologies and other environmentally sustainable antimicrobial solutions.
- Durable wash resistant treatments – The industry is focusing on technologies capable of retaining antibacterial performance even after repeated laundering.
- Growing demand for odor control textiles – Continued consumer demand for freshness, hygiene and microbe safe textiles is driving growth in odor-control apparel and functional textiles.
- Smart functional fabrics – Advanced textiles combining antimicrobial functionality with moisture management, thermoregulation, and performance enhancement are gaining attention.
Choosing the right testing laboratory
Looking to validate the antibacterial performance of your textile products? At Microbe Investigations Switzerland (MIS), we support textile manufacturers and textile brands with advanced antimicrobial testing solutions across textile industries including apparel, medical textiles, home furnishings, hygiene products, odor control apparels and similar.
We offer AATCC 100 testing for antibacterial efficacy evaluation, wash durability assessment, product comparison studies, and performance validation tailored to our client’s unique product needs.
Whether you are developing next-generation antimicrobial textiles or preparing products for global markets, experts at MIS can help you thoroughly guide through each step of testing and validation and generate reliable scientific data to rely on
For your AATCC 100 testing needs, contact us today.
FAQs
1. Is AATCC 100 a quantitative test method?
Yes. AATCC 100 is a quantitative test method that measures bacterial reduction on treated textile materials.
2. What is the difference between AATCC 100 and AATCC 147?
AATCC 100 provides quantitative bacterial reduction data, while AATCC 147 is a qualitative screening method based on zones of inhibition.
3. Can washed textiles be evaluated using AATCC 100?
Yes. Manufacturers test fabrics after multiple wash cycles to ensure the durability of antimicrobial performance.
4. Does AATCC 100 test antiviral activity?
No. For antiviral testing ISO 18184 is a suitable standard.
5. How is bacterial reduction calculated in AATCC 100?
Bacterial reduction is determined by comparing viable bacterial counts recovered from treated textiles against untreated controls or initial inoculum levels.
6. Is AATCC 100 suitable for hydrophobic textiles?
No.
7. What is the difference between AATCC 100 and ASTM E2149?
AATCC 100 uses a static contact method, while ASTM E2149 uses a dynamic shake flask method particularly useful for hydrophobic or non-leaching materials.
8. Does AATCC 100 require untreated control fabrics?
Yes. Untreated control fabrics are typically included in AATCC 100 testing to compare reduction in bacterial load between treated and untreated samples.
