Prepare the Solution
Standard soap at 5 g/L in distilled water.
Knit Fabric Manufacturer Since 2009 · China
TEST METHOD · ISO 105-C10
Colour Fastness to Soaping ISO 105-C10
ISO 105-C10 measures colour loss and staining when a fabric is agitated in a soap solution. China’s GB/T 3921 follows it. There is no direct AATCC equivalent.
Specimens cut from the bulk lot.
Standard
ISO 105-C10:2006
China
GB/T 3921:2008
Most used
Method A: 40 °C, 30 min
Grading
Grey scales, 1–5
01
What This Test Measures
A fabric and multifibre composite is agitated in a soap solution, rinsed, dried and graded for colour change and staining. Chinese domestic specifications usually call for method A.
02
How We Run It in Our Lab
Our technicians follow a written work instruction for this method.
Soaping uses the same launder tester as ISO 105-C06, with soap instead of reference detergent.
Prepare the Specimen
A 40 × 100 mm composite is weighed and placed in the container at a liquor ratio of 50:1.
Wash
Method A: 40 ± 2 °C for 30 minutes. Method B: 50 °C for 45 minutes.
Rinse, Dry and Grade
Rinsed, dried at no more than 60 °C and graded. Graded with the ISO 105-A02 grey scale for colour change and A03 for staining (AATCC EP1/EP2 for AATCC methods), under the agreed light source in a light booth, by at least two technicians.
03
Test Conditions
Key settings. Write the method and procedure in your specification.
| Parameter | Setting |
|---|---|
| Soap | 5 g/L standard soap |
| Liquor ratio | 50:1 |
| Method A | 40 ± 2 °C, 30 minutes |
| Method B | 50 ± 2 °C, 45 minutes |
| Grading | Grey scales, 1–5 |
| Equivalent methods | No direct US equivalent · GB/T 3921 (China). Compare methods → |
04
Results for Your Order
Ask us for results for the selected fabric, shade and test conditions. Acceptance values for your order are agreed in writing.
05
Writing This Test into Your Specification
Choose C06 or C10
Export specifications usually use ISO 105-C06 or AATCC 61; C10 is common in Chinese specifications. Do not mix grades from the two.
Name the Method Letter
Write ISO 105-C10 A or B. Method B is hotter and longer.
For the Chinese Market
GB/T 3921 method A matches ISO 105-C10 method A.
06
Questions About ISO 105-C10
What is the difference between ISO 105-C06 and ISO 105-C10?
C06 simulates laundering with reference detergent and steel balls; C10 measures fastness to soaping with a soap solution. Results are not interchangeable.
Is GB/T 3921 the same as ISO 105-C10?
GB/T 3921:2008 follows ISO 105-C10:2006. Chinese specifications usually use method A, 40 °C for 30 minutes.
Which method should I use for export orders?
Most specifications for Europe and the US use ISO 105-C06 or AATCC 61. Use C10 when your brand or market names it.