Weathering xenon arc

Figure 22.6. Accelerated weather testing, (a) Xenon arc Fade-Ometer. (Courtesy of Atlas Electric Devices Company.) (b) Fluorescent lamp QUV accelerated weathering tester. (Courtesy of Q-Panel Company.) (c) Xenon arc Weather-Ometer. (Courtesy of Atlas Electric Devices Company.)...

To determine the stability of the resin color, samples were exposed to UV in an Atlas Xenon Arc Weather-ometer. Samples previously tested for dry shear strength and samples of the cured, neat resin were exposed for 100 and 200 hours in the weather-ometer. One hundred hours of exposure is approximately equivalent to 1 year of exposure to sunlight at the latitude of Chicago. The resin was the same color as the wood or lighter after both lengths of exposure. 

Figure 16.10 Scanning electron micrographs of the surface of ABS (UV stabilized) and ASA after 500 h of xenon arc weathering according to ISO 4892-2A...

Degradable Low-Density Polyethylene (LDPE) Films. Typical xenon arc embrittlement times for unstabilized low-density polyethylene are l600-2UOO hrs. The controls chosen for this research are listed in Table II the thin LDPE garment bag embrittled in 1820 hr and the EcoPlastics LDPE control became brittle after 2075 hr xenon irradiation. The thin garment bag was not brittle, as determined by a fold test, after 18 months outdoor exposure. The Dupont "Sclair" LDPE control listed in Table II was unusual since it had short embrittlement times of 1175 hr in the Weather-Ometer and 6.5 months outdoors. This film was used as a yardstick to measure the Degradable LDPE films since a Degradable Plastic should not last more than 6 months, perhaps less, outdoors and 1200 hr in the xenon arc Weather-Ometer. 

Figure 2. IR and tensile changes PmPiPA photodegradation. Xenon arc Weather-Ometer stress-strain data 44 tex, 2 ply yam Nomex. A A> vacuum irradiated 0, air irradiated. Initial elmga-Hon at break, 30%, Initial tensile strength, 9,0 X 10" g cmr, IR data lOfi films, Trans, + IRS, x(dp = 0.55/ij.

Figure 4. IR and tensile changes PET photooxidation. 21/1 Mylar film, irradiated Xenon arc Weather-Ometer. Initial elongation at break, 190%. Initial tensile strength, 7.3 X 1(P g cm. dp = depth of penetration for IRS ir spectra.

Figure 5. IRS ir spectra of air irradiated PPiPA films. Ge reflection element, 45 incidence. Film surface directly irradiated for specified times with Xenon arc Weather-Ometer. Ge curve due to reflection element alone (8).

Figure 7. Surface changes during PP photooiadation electron micrographs. A, 24 hr irraduUion flm and irrcSUation conditions in Figure 2. B, llSp. PP monoifilameta, ftMy oriented. C, D—130fi PP monofilament, medium orientation. B and D—19S hr, C— 275 hr. Xenon arc Weather-Ometer.

Five replicate specimens of western redcedar and their longitudinally end-matched controls were artificially weathered (xenon arc Weather-Ometer, approximately 24-h light and 4-h deionized water spray daily). The Weather-Ometer was shut down for about 1 h Monday through Friday in order to soak the specimens in dilute acid for 15 min. Six types of acid soaks were used nitric and sulfuric acids at pHs of 3.0, 3.5, and 4.0. I found similar results with both acids. Compared with the unsoaked controls, the 3.0 pH acid caused a 10% increase in erosion rate. At a pH of 3.5 the effect was a 4% increase due to the acid, and no effect was found at a pH of 4.0. 

Figure 13. Inhibition of light-induced discoloration of SAN. Exposure xenon arc weather-ometer.

TABLE 17.1 Rate of Loss of UVAs in PMMA When Exposed to Xenon Arc Weathering [8]... 

Treatment was conducted in a xenon-arc weathering box at standard conditions according to ASTM D2565 [12]. 

Irradiation in an Atlas xenon arc Weather-Ometer. Hydroperoxide concentration after irradiation, estimated from the 3400cm i.r. absorption (extinction coefficient = 70M cm" ). After 8h immersion in 3.3 x 10 m solution of I in iso-octane. 

Figure 14.19 Color change during xenon arc weathering of transparent ITR resin formulations [195].

Figure 14.20 Change in light transmission (A%T) and haze (A%H) during xenon arc weathering [196].

The Atlas Xenon Arc Weather-O-Meter is nsed according to ASTM D822-01 [123]/G155 [124]. In this cabinet the coated panel is exposed to a cycle of 102 minntes light, followed by 18 minutes light together with water spray. 

Fig. 2.10 Synchronization of multiple failure modes in PET films achieved for both the outdoor Florida and accelerated xenon arc weathering exposures...

Scott KP, Hardcastle HK (2009) A new approach to characterizing weathering reciprocity in xenon arc weathering devices. In Martin JW et al (eds) Service life prediction of polymeric materials global perspectives. FSCT, Springer, New York, Chapter 6... 

Weathering (9). Free films of commercially available silicone and polyurethane construction sealants were placed back-to-back in a frame where the films were separated with an aluminum divider. All of the free films were loaded into a xenon-arc Weather-o-meter (Atlas Electric Devices Company) for weathering. One series of films was thus exposed to light and water while the other was exposed to water only. The total time of exposure was 8000 hours. 

Accelerated Weathering xenon-arc Weather-Ometer 20.8 8 94 97 Relative tensile modulus strain calculated from grip separation Halar Ausimont Specimen 2 mm (0.08 in) nominal thickness, microtensile specimen to ASTM D1708... 

Accelerated Weathering xenon-arc Weather-Ometer 63 8.3 2 Data from GE Plastics literature 53 0.35 Watts/sq-m irradiance 340 nm tensile strength at yield Specimen Without stabilizer... 

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