Colorfastness to Ozone in the Atmosphere under Low Humidities
AATCC 109-2016 pdf free.Colorfastness to Ozone in the Atmosphere under Low Humidities.4.4 Exposure to chemicals used in thisprocedure must be controlled at or belowlevels set by governmental authorities(e.g..Occupational Safety and Health Administration’s [OSHA] permissible exposure limits [PEL] as found in 29 CFR1910.10OO; see web site: www.osha.govfor latest version). In addition, the American Conference of Governmental Industrial Hygienists (ACGIH) ThresholdLimit Values (TLVs) comprised of timeweighted averages(TLV-TWA)，shortterm exposure limits (TLV-STEL) andceiling limits (TLV-C) are recommendedas a general guide for air contaminant ex-posure which should be met (see 12.1).5. Uses and Limitations
5.1 Although this test works well forsome substrates, it is not suitable for nylon carpets. For nylon carpets，refer toAATCC Test Method(TM) 129,Colorfastness to Ozone in the Atmosphere Un-der High Humidities.
6.Apparatus and Materials (see 12.2)6.l Ozone exposure chamber for ambient temperatures and relative humiditiesnot to exceed 67% (see 12.3).
6.2 Gray Scale for Color Change(AATCC Evaluation Procedure 1) (see12.4).
7. Test Specimens
7.1 Cut each test specimen at least 10.0×6.0 cm (4.0 × 2.375 in.). For subsequent color comparisons. keep the unexposed sample in an airtight containeraway from iight to avoid shade change.7.2 When a laundered or drycleanedspecimen is used, the effects of ozone arebased on comparisons with the color ofthe unexposed laundered or drycleanedspecimen. To prepare specimens for test-ing after laundering or drycleaning, useTM61,Colorfastness to Laundering: Accelerated, and TM132,Colorfastness toDrycleaning, respectively.
8.1 Suspend the test specimens in theexposure chamber (see 12.3).The test apparatus should be located in a room inwhich the ambient air temperature is 18-28C(64-82F) and the relative humiditydocs not exceed 67%.For reference and interlab testing, conduct tests in a room or chamber with the standard atmospheric conditions of 21 ± 2°C (70 ± 4°F) and 65 ± 5% RH. Ozone should be present in concentrations of 4.5 ± 1 ppm for 4.5 ± I h. This constitutes one cycle (see 12.5).
8.2 Remove those specimens which exhibit a color change at the end of one cycle. One cycle will generally produce a measurable color change in specimens which are ozone sensitive.
8.3 Run additional similar cycles as necessary.
9.1 At the end of each cycle immediately compare those specimens which are removed from the exposure chamber with the preserved originals from which they were drawn.
9.2 Rate the effect on color of test specimens after any specified number of cycles by reference to the Gray Scale for Color Change IAATCC Evaluation Procedure (EP) II or using EP7, Instrumental Assessment of the Change in Color of a Test Specimen. and record the numerical rating that corresponds to the appropriate one on the Gray Scale. Report the number of cycles run (see I 2.6).
10.1 Report the numerical grade for the change in color of each test specimen, the number of cycles run and the temperature and relative humidity at which the test was performed.AATCC 109 pdf free download.Colorfastness to Ozone in the Atmosphere under Low Humidities