A fabric may absorb sweat, spread it, move it away from the skin, or simply hold it where it first lands. These behaviours are related, but they are not the same. AATCC TM195 helps separate them.
Moisture management has become an important selling point in activewear, innerwear, sports uniforms, socks, workwear and next-to-skin clothing. Yet the phrase is often used loosely. A fabric may be described as “moisture managing” merely because it is made from polyester, contains a finish, or dries quickly in an informal trial. Such statements can be misleading because comfort depends on several different processes: wetting, absorption, liquid transfer through the thickness, spreading across each surface, evaporation and heat transfer.
AATCC TM195, Liquid Moisture Management Properties of Textile Fabrics, is designed to measure, evaluate and classify the dynamic liquid-moisture behaviour of knitted, woven and nonwoven fabrics. It is particularly useful when a buyer, mill or product developer wants to understand what happens after liquid sweat reaches the skin-facing side of a fabric.
How the Moisture Management Tester Works
A specimen is placed horizontally between an upper and a lower sensor. The upper surface normally represents the side worn next to the skin, while the lower surface represents the outer side of the garment. A controlled test liquid is introduced onto the upper face. Concentric sensor rings then track changes in electrical response as the liquid wets, spreads and passes through the fabric.
The instrument does not produce only one number. It records a time-dependent moisture profile for both fabric faces. A commercial MMT system typically reports wetting time, absorption rate, maximum wetted radius and spreading speed for the top and bottom surfaces, together with one-way transport capability and Overall Moisture Management Capability. The SDL Atlas MMT literature describes this as a two-minute performance profile. Laboratories should, however, follow the current authorised version of the test method rather than rely on an instrument brochure for procedural details.
The tester separately tracks wetting and spreading on the skin-facing and outer surfaces.
The Main Results and What They Mean
| Result | Practical interpretation | Common misunderstanding |
|---|---|---|
| Wetting time | Time before each surface begins to wet. A shorter time means that face responds to liquid sooner. | Fast wetting alone does not prove that moisture moves away from the skin. |
| Absorption rate | Rate at which the measured water content rises on each surface after wetting. | High top-face absorption may mean that sweat is being retained near the skin. |
| Maximum wetted radius | Farthest radial distance reached by liquid on the top or bottom sensor. | It should not be treated as a complete measurement of irregular wetted area. |
| Spreading speed | How quickly the wetting front travels across each face. | Fast spreading can support evaporation, but the test does not directly measure evaporation. |
| Accumulative one-way transport | Compares accumulated liquid on the outer face with that on the skin face. A strongly positive value generally indicates preferential movement toward the outer side. | Its sign and meaning depend on correct face orientation. |
| OMMC | A composite index based on bottom-face absorption, one-way transport and bottom-face spreading. | It is not a universal comfort score and should not replace the individual results. |
The University of Zagreb Textile Faculty’s MMT laboratory page lists the same output family: OMMC, one-way transport, top and bottom wetting time, absorption rate, maximum wetted radius and spreading speed. This is why an MMT report should be read as a pattern rather than reduced immediately to one grade.
Why OMMC Must Be Read Carefully
Overall Moisture Management Capability is useful because it combines three desirable behaviours: liquid should be taken up on the outer face, transported preferentially from the inner face to the outer face, and spread on the outer face. In commonly reported formulations, one-way transport receives greater weight than either bottom absorption or bottom spreading. The logic is sensible: a fabric that absorbs sweat but keeps it beside the skin is not managing moisture in the same way as a fabric that moves it outward.
Nevertheless, two fabrics with similar OMMC values may behave differently. One may achieve its score through strong one-way transport but moderate spreading; another may spread rapidly while showing weaker through-thickness transfer. Product developers should therefore retain the complete top-versus-bottom result table and moisture curves when comparing constructions or finishes.
Three Typical Moisture-Management Patterns
- Absorbent but clammy: The top surface wets quickly and absorbs strongly, while bottom-face spreading and one-way transport remain low. A hydrophilic fibre can absorb sweat without efficiently moving it away from the skin.
- Water-repellent on both faces: Wetting is delayed and the wetted radii remain small. This may be desirable for an outer shell, but it is usually not the desired next-to-skin behaviour for activewear.
- Directional moisture management: The skin face accepts the liquid, the outer face wets and spreads, and the one-way transport value is positive. This pattern is often sought in plated knits, engineered blends and fabrics with different inner and outer surface chemistries.
The same amount of liquid can produce very different top-versus-bottom moisture patterns.
Why Fibre Content Alone Cannot Predict the Result
Cotton is hydrophilic, while conventional polyester is relatively hydrophobic, but a simple cotton-versus-polyester rule is inadequate. Yarn twist, filament or staple form, cross-section, yarn packing, loop geometry, fabric density, thickness, surface roughness, capillary paths and chemical finish all influence the result. A polyester knit with engineered capillaries and a durable hydrophilic finish may transport liquid effectively. A dense cotton fabric may absorb well but spread or dry slowly.
The two faces may also be intentionally different. In a plated knit, a low-absorbency inner yarn can help direct liquid toward a more absorbent outer layer. Brushing, raising, calendaring, coating and softening may alter surface contact and capillary continuity. Readers may connect this with earlier My Textile Notes explanations of how cotton absorbs moisture, the role of textile finishing, and the moisture behaviour of nylon 6,6.
A Practical Testing Plan for Mills and Buyers
- Define the end use first. Innerwear, running shirts, school uniforms and waterproof shells do not require the same liquid behaviour.
- Mark the fabric faces. Record clearly which side touches the skin. Reversing the specimen can reverse the apparent direction of transport.
- Compare construction stages. Test greige, dyed and finished fabric when possible to separate structural effects from finishing effects.
- Check durability. Repeat testing after the agreed laundering sequence. A strong initial result from a non-durable hydrophilic finish may disappear in use.
- Use complementary tests. AATCC lists separate methods for vertical and horizontal wicking, drying time, drying rate and water-vapour transmission. These properties should not be inferred from TM195 alone.
- Judge consistency, not one specimen. Compare replicates, lots, colourways and production batches, especially when a moisture-management claim will appear on packaging or in buyer specifications.
For Indian apparel suppliers, this distinction is commercially important. A mill may develop a polyester–cotton school-uniform fabric, a plated sports knit or a finished hosiery fabric and obtain an attractive OMMC value. That result becomes meaningful only when it is linked to the correct fabric face, wash durability, garment construction, intended climate and complementary drying or vapour-transfer data.
Moisture management is created by the whole textile system, not fibre content alone.
What TM195 Does Not Tell Us
TM195 does not directly reproduce the complete human microclimate. It does not by itself measure sweat evaporation into moving air, water-vapour transmission, thermal resistance, garment fit, pressure at the skin, cling, chafing or the wearer’s subjective sensation. A fabric can move liquid efficiently yet still feel hot because of low air permeability or garment design. Conversely, a loosely constructed fabric may feel comfortable in mild activity even without a high directional-transport score.
This is why AATCC lists TM195 alongside separate moisture, wicking, drying and water-vapour test methods. Good product evaluation treats these tests as complementary pieces rather than competing claims.
Conclusion
AATCC TM195 is valuable because it separates the journey of liquid moisture into observable stages. It tells us when each face wets, how rapidly moisture content rises, how far and how quickly liquid spreads, whether transport is preferentially directed away from the skin, and how these behaviours combine in OMMC.
The most useful question is therefore not, “Which fabric has the highest OMMC?” It is, “Does this top-versus-bottom moisture pattern suit the garment, wearer, climate and use condition?” When read in that way, the test becomes more than a laboratory grade. It becomes a practical development tool for fibre selection, fabric engineering, finishing, quality assurance and truthful product communication.
Related Reading on My Textile Notes
- How Cotton Fiber Absorbs Moisture
- Textile Finishing
- Properties of Nylon 6,6
- Open End Yarn Properties Compared with Ring Yarn
Sources and Acknowledgement
- AATCC TM195: Liquid Moisture Management Properties of Textile Fabrics
- AATCC Standard Test Methods and Procedures
- SDL Atlas Moisture Management Tester brochure
- University of Zagreb Faculty of Textile Technology: Moisture Management Tester
- Centexbel: Liquid Moisture Management Properties according to AATCC TM195
General disclaimer: This article is for educational and technical understanding. Laboratories and suppliers should use the current authorised test method, calibrated equipment, agreed conditioning and sampling procedures, and buyer-approved specifications for commercial decisions.
Was this article useful?
Goyal, P. AATCC TM195 Explained: How to Read Moisture Management Test Results. My Textile Notes. Available at: https://mytextilenotes.blogspot.com/2026/08/aatcc-tm195-explained-how-to-read.html
If you have a question related to this topic, you are welcome to ask it in the My Textile Notes Discussion Forum.
Students, merchandisers, designers, researchers and textile professionals are welcome to participate.
No comments:
Post a Comment