ISO 105-E04 Color Fastness to Perspiration Guide 2026

Of course, you take the decisive decision for product quality as a Quality Control Manager in 2026. In fact, one of the chief issues seen in activewear is poor color fastness to perspiration. It is a cumbrous issue that happens when the dye bleeds due to the humidity of sweat. This is a very important customer complaint that is bound to lead to product returns, and also helps to worse your brand's reputation for many years.

By the knowledge on this industrial test, meetings, it is assured that not only your brand is protected from the consequences, but also your customers are satisfied.

Key Takeaways

• What's ISO 105-E04? As the name suggests, this is a universal testing method that fabric producers can follow to find out how well the fabric can maintain color when in sweltering conditions. It involves both acidic and alkaline solutions.
• Schema to Follow: Dyed fabric will eventually lose its original color when exposed to perspiration. As a result, customers complain. Dyes are not transferred only to the skin but also to the fabric underneath.
• Grading Scale: The measurement is based on a 1-5 scale, with 1 being the lowest and 5 the highest. A preferable target for professional sportswear is Grade 4.
• Grade 4 is Achievable: A smart selection of dye and fabric is the first rule. Moreover, our D036 Nylon Interlock Acid Print process is specifically developed to achieve slips of equal or above Grade 4.

The Importance of Color Fastness to Perspiration in QC

Color fastness to perspiration refers to the ability of fabric colors to resist dye bleeding or fading. This occurs when the fabric comes into the contact of moisture.

If any clothing brand got through this test failing, it creates problems immediately. Customers notice colors on their skin or other clothes. This results in bad reviews and loss of trust. The direct reason for that is more product returns and losses.

The issues dying companies have are not just brand reputation-related. There are safety issues too, such as some safety and health environments warning of healthcare risks from dye transfer. The skin can absorb dye chemicals.

This problem is a nightmare for sportswear that are used in vigorous workouts and are thus tight against the skin. They are often made of synthetic materials which is why a thorough control of sweat is imperative.

The ISO 105-E04 Test Procedure: A Brief Description

ISO 105-E04 is an internationally accepted standard. It assesses the ability of fabric to withstand sweat. It is stricter than some regional standards. It pits fabrics against acidic and alkaline solutions as well. This mirrors the body chemistry which varies among individuals. Thus, fabric is guaranteed for good performance for all customers, in all parts of the world. Many laboratories perform tests to different standards including ISO 105 E04, AATCC 15, and JIS L 0848.

The Important Equipment & Materials

• Perspirometer (the equipment that applies standard weight)
• Oven (set to 37 ± 2 °C, to simulate body temperature)
• Multi-fiber fabric (strip with different types of fibers like wool, cotton, polyester, etc.)
• Grey Scales (to assess color objectively)
• Alkaline & Acidic artificial sweat solutions

6 Steps in the Test Protocol

1. Specimen Preparation: A piece of test fabric is sewn to a multi-fiber fabric. This creates a "composite specimen."
2. Wetting: The specimen is soaked completely in either acidic or alkaline sweat solution.
3. Loading: The wet specimen is placed between two acrylic plates inside the Perspirometer.
4. Pressure & Incubation: The plates are applied with a standard weight. The entire instrument is placed in the oven for 4 hours at 37°C. This simulates sweat, heat, and body pressure.
5. Drying: The specimen is removed after 4 hours. The stitching is taken off. The fabrics are stood up to dry indoor (maximum of 60°C not being exceeded).
6. Assessment: After being dry, the fabrics are looked at in standardized light boxes. This examines for any color changes.

Interpreting the Test: Knowing the Scale of Grading from 1 to 5

Following the test, the color and the staining are examined in two separately marked Gray scales.

• Change of Color: What degree of fading did the original color get? This is observed by viewing the plain piece of cloth against the tested one.
• Staining: How much of the stain went to the different fibers of the multi-fiber fabric? This means the dye can, in some cases, stain other garments.

The grades range on a 1-5 scale. The grading system goes from Grade 1 (poor resistance) to Grade 5 (excellent resistance).

From Theory to Practice: Consistently Achieving Grade 4

Passing this test all starts with the use of top-notch dyes. A correct dyeing process is required. Complete washing is also necessary to get rid of any free dye that remains. Some fabric and print pairings are inherently vexing though.

A typical issue we face with lightweight nylon/spandex interlocks. These fabrics are perfect for performance wear. But their stretch and light weight can make them difficult to print on. This happens without dye migration issues. In these cases, a specialized process is fundamental for the good performance of fabric color fastness to perspiration.

We propose a two-component approach. One, we apply an Acid Print process. It has been formed to initiate strong covalent bond formation. This is a loop of the chemical left behind permanently when the dye and nylon fiber are connected. Covalency makes it possible to seclude dye from getting leached under the conditions of chemicals, heat, and pressure that prevail during the ISO 105-E04 test.

Two, on this particular process, the quality of the base is also important. Our Nylon Interlock D036 fabric which has a very stable structure provides a great “canvas” for printing. Its unique configuration we call "One-Open-One-Close" (一开一闭). The double-jersey knit that is so tight is an effective solution to the curling and shifting problems faced by the other 160gsm fabrics. The result is a smooth, even surface that ink can grip. This means better penetration and fixation.

Our approach works perfectly. The optimized Acid Print process has been applied to the Nylon Interlock D036: The 160gsm Interlock That Won't Curl or Warp Prints which is the only one that always gives Grade 4 color fastness to perspiration. This ensures that the bright and complex prints stay focused and do not bleed during consecutive workouts.

Q&A on Antiperspirant and Color Fastness

1. How do ISO 105-E04 and AATCC 15 tests differ?

Both tests determine color fastness to perspiration. ISO 105-E04 is more widely found in Europe and Asia, while AATCC 15 is used more frequently in North America. They have small differences in the artificial sweat formula. The ISO standard is often seen as more complete. It requires testing with both acidic and alkaline solutions.

2. Is a Grade 3 result a "pass" or "fail"?

This depends on your brand's quality standards. For a dark-colored yoga top that has lots of skin contact, Grade 3 for staining would likely be a fail. For an outer layer with less contact, it might be acceptable. Most premium activewear brands demand Grade 4 for high-contact items.

3. Does the dye color affect the test result?

Yes, very much. Certain dye colors are harder to fix to fabric. Some vibrant reds and royal blues are known to be problematic. They are more likely to bleed. Deep, dark colors are also more challenging than light pastels. This is because there is more dye on the surface that could potentially escape.

4. Can a fabric have good wash fastness but poor perspiration fastness?

Absolutely. The tests measure resistance to different things. Wash fastness tests how fabric holds up to detergent, water, and washing machine action. Perspiration fastness tests resistance to specific pH levels and chemicals in sweat, under heat and pressure. A fabric must be tested for both.

5. How can I quickly check a sample in-house before sending it to a lab?

For a quick, non-standard check, you can do an "iron test." Dampen a small spot on the fabric with water. Place a piece of white cotton cloth over it. Press with a warm iron. If you see significant color transfer onto the white cloth, it is a big red flag. The fabric will likely fail a formal ISO 105-E04 test.