Nippon Kayaku (Thailand) CO., LTD.
Technical Service Center[Kayacion CF-COMJ color fastness to natural sunlight]
・ We received an inquiry from a reader of our monthly technical information releases, who is currently using ourKCN CF-COMJ trichromatic color series. The question was regarding considerable fading of fabric dyed withKCN CF-COMJ trichroma after being left for a while by the window with exposure to sunlight.
(*KCN CF-COMJ is KCN CF-COM series sold in Japan.)・ The answer is that considerable fading can be expected. Even CDP-dyed fabrics show fading in a few days ofsunlight, so cotton-dyed fabrics may fade faster. For reference, please see our Technical Information Vol. 1.
・ However, we did not have actual sunlight exposure data for KCN CF-COMJ series, so with this opportunity,
we set out to conduct this test.
・ As we conducted the test for both summer sunlight and winter sunlight, a considerable amount of time wasused in producing the results for this test.

Winter Sun exposure

Summer Sun exposure

Side note: Surprisingly, there were only a few days where the sun was not hidden behind clouds.

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500
TEL: +66-2-235-2843 HP: http://www.kayakuth.co.thResults: Light fastness of fabric dyed with KCN CF-COMJ trichroma after exposure to natural sunlight
Exposure conditions
Winter Sun Exposure
DateMaximum Temperature
WeatherWind

2021/12/21

Clear

None ~ slight breeze

28℃ (11:30)

2021/12/22

Clear

None ~ slight winds

22℃ (12:30)

2021/12/27

Clear

None ~ slight winds

21℃ (13:00)

2021/12/28

Clear

None ~ slight winds

20℃ (14:00)

2022/01/12

Clear

Slight winds

19℃ (12:00)

2022/01/14

Clear

Slight winds

17℃ (13:00)

2022/02/02

Clear

Slight winds

21℃ (13:00)

Summer Sun Exposure(Alcohol thermometer)

Completed 3 days of exposure

Completed 5 days of exposure

Completed 7 days of exposure

Maximum Temperature

Date

WeatherWind

2022/06/27

SunnyNone ~ slight winds

48℃ (13:30)(Alcohol thermometer)

2022/06/30

SunnyNone ~ slight winds

49℃ (10:30)

2022/07/01

Clear-SunnyNone ~ slight winds

51℃ (12:15)

2022/07/25

SunnySlight winds

44℃ (11:00)

2022/07/28

Sunny

Slight winds

47℃ (12:00)

2022/08/03

Sunny

Slight winds

50℃ (13:00)

2022/08/09

SunnyStrong winds

45℃ (13:45)

Completed 3 days of exposure

Completed 5 days of exposure

Completed 7 days of exposure

Exposure time 07:30 AM -> 15:00 PM (7.5 h exposure)

Monthly AverageTokyo

UV INDEX

Extremely HighVery HighHigh

MediumLow

Month
Reference: Data from Japan Meteorological Agency

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500TEL: +66-2-235-2843 HP: http://www.kayakuth.co.th

・ The test was conducted in Akabane, Tokyo Prefecture. The monthly UV index data in 2021 for Tokyo
Prefecture is shown.
・ It has been nearly 20 years since the Kayacion CF trichroma has been introduced and sold, but both the CF-Jdyes and the CF-COMJ dyes have never received complaints from the market regarding light fastness to date.
In other words, it may be that the current test results of sunlight irradiation are at a “level that is acceptable bythe market”.
・ Our understanding is that the cotton dyed fabric fading problem caused by light is usually due to Reactive
Black 5 or dyes which use Reactive Black 5 as the main component. This problem may also be caused by therare case of [Dyeing -> Fix -> Reduction decolorization -> Re-dyeing].
・ Light fastness tests conducted in this test:
ISO Xenon-arc Grade 4 Irradiation

JIS Xenon-arc Grade 4 Irradiation

JIS Carbon-arc Grade 4 Irradiation

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days (1 week)

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days (1 week)

RecipeKCN Yellow CF-COMJKCN Red CF-COMJ
KCN Blue CF-COMJ

Brown
0.496
0.343
0.184

Grey
0.236
0.197
0.641

Dyeing conditions
Liquor ratio
Na2SO 4/Soda Ash
Kayatector E
Dyeing time & temperature

12:1
24/20 g/L
1 g/L
60℃×50min.

Light fastness values were judged with grey scale.

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500
TEL: +66-2-235-2843 HP: http://www.kayakuth.co.thISO Xenon-Arc Grade 4

JIS Xenon-Arc Grade 4

JIS Carbon-Arc Grade 4

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

ISO Xenon-Arc Grade 4

JIS Xenon-Arc Grade 4

JIS Carbon-Arc Grade 4

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

Light Fastness
Machine (SUGA)

Winter Sunlight
Exposure

Summer Sunlight
Exposure

Light Fastness
Machine (SUGA)

Winter Sunlight
Exposure

Summer Sunlight
Exposure・ Exposure to natural sunlight displays similar fading trend to exposure to ISO Xenon-Arc irradiation.
・ Summer sunlight is around 1 to 1.5 grade worse compared to winter sunlight, due to the difference intemperature and UV intensity.
・ Color measurement values are attached on the next page for your reference.
・ [value] in the tables below refers to the concentration ratio after exposure with reference to unexposed dyedfabric.

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500
TEL: +66-2-235-2843 HP: http://www.kayakuth.co.th

Recipe
KCN Yellow CF-COMJKCN Red CF-COMJ
KCN Blue CF-COMJ
Brown

Light fastness machine(SUGA)

Brown

Brown
0.496
0.343
0.184

Grey
0.236
0.197
0.641

ISO Xenon-Arc Grade 4ΔEΔL*Δa*Δb*value

2.74
1.86-1.94
0.55
89.2

Winter Sunlight 7.5 h x 3 days

12:1
24/20 g/L
1 g/L
60℃×50min.

JIS Xenon-Arc Grade 4

JIS Carbon-Arc Grade 4

2.20
1.42-1.61
0.47
91.7

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Brown

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

Summer Sunlight
Exposure

ΔE
ΔL*
Δa*
Δb*
value

ΔE
ΔL*
Δa*
Δb*value

ΔE
ΔL*
Δa*
Δb*value

Light fastness machine(SUGA)Grey

ISO Xenon-arc Grade 4

ΔE
ΔL*
Δa*
Δb*value1.66
1.37
-0.80
0.51
92.2

Winter Sunlight 7.5 h x 3 days

0.99
0.57
-0.66
0.47
97.1

2.97
1.40
-2.29
1.18
94.6

1.27
0.95
-0.77
-0.33
93.1

ΔE
ΔL*
Δa*
Δb*value

3.47
2.40
-2.17
1.26
87.4

ΔE
ΔL*
Δa*
Δb*value

ΔE
ΔL*
Δa*
Δb*
value

Winter Sunlight
Exposure

Grey

1.58
0.57
-1.29
0.72
97.6

ΔE
ΔL*
Δa*
Δb*
value

Dyeing conditions
Liquor ratio
Na2SO 4/Soda Ash
Kayatector E
Dyeing time & temperature

4.34
2.57
-3.12
1.58
86.9

ΔEΔL*
Δa*
Δb*value

JIS Xenon-arc Grade 4

ΔE
ΔL*
Δa*
Δb*value

1.74
1.31
-0.88
0.76
92.9

Winter Sunlight 7.5 h x 5 days

2.11
1.49
-1.21
0.89
92.0

5.47
3.55
-3.78
1.75
81.7

JIS Carbon-arc Grade 4

ΔE
ΔL*
Δa*
Δb*value

0.81
0.71
-0.33
0.21
95.7

Winter Sunlight 7.5 h x 7 days

Winter Sunlight
Exposure

ΔE
ΔL*
Δa*
Δb*value

Grey

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

Summer Sunlight
Exposure

ΔEΔL*Δa*Δb*value

ΔE
ΔL*
Δa*
Δb*value

ΔE
ΔL*
Δa*
Δb*value

2.31
1.66
-0.99
1.27
91.2

ΔE
ΔL*
Δa*
Δb*value

3.63
1.51
-3.06
1.24
93.1

3.16
2.57
-1.40
1.20
86.0

ΔE
ΔL*
Δa*
Δb*value

2.78
1.88
-1.63
1.24
90.2

3.90
3.18
-1.74
1.43
82.9

・ The sunlight irradiation test was performed such that the test cloth always faced the sun.
・ As a result, we approximate that the light fastness machine grade 4 irradiation is about 7.5 hours of sunlightfor 3 days (intermediate value between winter and summer).
・ In addition, Xenon light is more similar to fading in sunlight, but we recognize that there are more Carbon-arcstandards for apparels in Japan.
NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500
TEL: +66-2-235-2843 HP: http://www.kayakuth.co.th

・ The standards used are decided by apparel manufacturer, so we are not in a position to say anything aboutthem, but overseas, Carbon-arc results are completely ignored. The standard for Japanese car seats is now theXenon-arc standard.
・ Recently, there have been increasing number of cases where Xenon-arc ISO or AATCC standards withirradiation for 20 or 40 hours and a minimum fastness level of grade 3-4 or higher is required with grey-scale.
・ Please refer to the next two pages for the irradiation results using Bluescale Grade 3 standard fabric andBluescale Grade 4 standard fabric.

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500TEL: +66-2-235-2843 HP: http://www.kayakuth.co.thLight Fastness: Bluescale: Grade 3 (Judged with Greyscale)

ISO Xenon-Arc Grade 4

JIS Xenon-Arc Grade 4

JIS Carbon-Arc Grade 4

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

ISO Xenon-Arc Grade 4

JIS Xenon-Arc Grade 4

JIS Carbon-Arc Grade 4

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Light Fastness
Machine (SUGA)

Winter Sunlight
Exposure

Summer Sunlight
Exposure

Light Fastness
Machine (SUGA)

Winter Sunlight
Exposure

Summer Sunlight 7.5 h x 7 days

Summer Sunlight
Exposure

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500
TEL: +66-2-235-2843 HP: http://www.kayakuth.co.thLight Fastness: Bluescale: Grade 4 (Judged with Greyscale)

ISO Xenon-Arc Grade 4

JIS Xenon-Arc Grade 4JIS Carbon-Arc Grade 4

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

ISO Xenon Arc Grade 4

JIS Xenon Arc Grade 4

JIS Carbon Arc Grade 4

Winter Sunlight 7.5 h x 3 days

Winter Sunlight 7.5 h x 5 days

Winter Sunlight 7.5 h x 7 days

Summer Sunlight 7.5 h x 3 days

Summer Sunlight 7.5 h x 5 days

Summer Sunlight 7.5 h x 7 days

Light Fastness
Machine (SUGA)

Winter Sunlight
Exposure

Summer Sunlight
Exposure

Light Fastness
Machine (SUGA)

Winter Sunlight
Exposure

Summer Sunlight
Exposure

NIPPON KAYAKU (THAILAND) CO., LTD.
ADD: 13th Floor, Ramaland Building, 952 Rama IV road, Suriyawongse, Bangrak, Bangkok 10500
TEL: +66-2-235-2843 HP: http://www.kayakuth.co.th