Colour Fastness to Washing:
Colour of a textile material refers to the dye that is used to impart certain colour or any pigment that is used to print on the fabric. These dyes or pigments tend to fade over time and also because of repeated washing. So it is important to test the fastness of any dyed or printed textile in order to assess the quality of the dye or pigment being used.
Colour fatness to washing means, a specimen of the textile, in contact with one or two specified adjacent fabrics, is mechanically agitated under described conditions of time and temperature in a soap solution, then rinsed and dried. The change in colour of the specimen and the staining of the adjacent fabric are assessed with the grey scales.
The colour fastness to washing is tested by assessing the colour loss and staining on adjacent fabric resulting from desorption and or abrasion action in one single test that is closely approximate to one commercial or domestic laundry.
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In my personal experience, in case of fastness test, colour fastness to washing is the first and most important requirements of buyers. There are a number of ISO test for colour fastness to washing.
List of ISO Test for Colour Fastness to Washing:
- ISO test no-1
- ISO test no-2
- ISO test no-3
- ISO test no-4
- ISO test no-5
- ISO 105 C06
- ISO 105 C06 A2S
- ISO 105 C06 B2S
- ISO 105 C06 C2S
Among them ISO 105 C06 is the first choice of maximum buyers.
Now I will discuss about those colour fastness test.
ISO 105 C06 Test Method:
Instruments:
- Rotawash / Gyrowash,
- Stainless Still Ball,
- Multi-fiber fabric,
- Grey scale,
- Sewing machine,
- Thermometer,
- Colour matching cabinet
Recipe:
- Sodium Perborate…………..1 gm/litre
- ECE Phosphate……………..4 gm/litre
Sample Preparation:
A 100 mm × 40 mm test specimen is taken and attached to a 100 mm x 40 mm multi-fibre adjacent fabric by sewing along one of the shorter edges, with the multi-fibre placed adjacent to the face-side of the specimen.
Working Procedure of Colour Fastness to Washing:
Collecting the sample from bulk and then conditioning for 4.30 to 6 hours
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Making a specimen of 04 cm x 10 cm in size.
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Sewing the specimen with multi-fibre fabric of same size at one corner.
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Making the solution of 4gm/litre ECE detergent and 1 gm/litre sodium perborate, (If required SKFL use 0.15 gm/litre TAED).
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Putting the specimen with multi-fibre fabric into the solution in Rotawash m/c
(Prog.: C2S Temp.: 60oC/ 40oC Time: 30 min Still ball: 25 pcs)
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Rinsing with hot water respectively.
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Squeezing with cold water of the sample is done (Hand Wash).
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Then drying is done at a temperature in the air not exceeding 60oC
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The stitching is then broken out except on one of the shorter end.
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Measuring the staining and colour change by grey scale and make a test report.
For ISO 105 C06 A2S:
- Total solution (changeable) ………150 ml
- Stainless Still Ball………………………..10 (for hitting)
- Time……………………………………………40 min
- Temperature………………………………40oC
Everything is same.
For ISO 105 C06 B2S:
- Total solution (changeable) ………150 ml
- Stainless Still Ball………………………..25 (for hitting)
- Time……………………………………………40 min
- Temperature………………………………50oC
Everything is same.
For ISO 105 C06 C2S:
- Total solution (changeable) ………50 ml
- Stainless Still Ball………………………..25 (for hitting)
- Time……………………………………………40 min
- Temperature………………………………60oC
Everything is same.
You may also like:
- Different Types of Colour Fastness Test | Factors Affecting Colour Fastness
- Various Fastness Methods Given to the Dyed Material
- How to Determine Color Fastness to Wash
- Light Fastness of Textiles: Factors Affecting and Control Measures
- Color Fastness to Laundering Test
- Factors Affecting the Rubbing Fastness of Textile Materials
Founder & Editor of Textile Learner. He is a Textile Consultant, Blogger & Entrepreneur. He is working as a textile consultant in several local and international companies. He is also a contributor of Wikipedia.