ASTM G154-12 PDF

Designation: G? 12a Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials1. ASTM CommiKee E44 intends to address these concerns by creaIng a standard on meeIng the ASTM G‐ Standard PracIce for. OperaIng Fluorescent. Engaged Expert Terry Candlish discusses ASTM G and G tests which are used to evaluate sunlight and moisture exposure. ASTM.

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Auditing Consulting Sourcing Training. Ordinary glass is essentially transparent to light above about nm. Differences in lamp intensity or spectrum may cause signi? For determining conformance to the relative spectral irradiance requirements for a? Aging of glass can result in a signi? Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world.

However, there is no simple equation for calculating exposure. Our Engaged Experts can help you select the best UV bulbs for your testing purposes.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. E Previous versions of this standard used window glass? When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect. The spectral power distribution data is for lamps within the aging recommendations of the device manufacturer. These are not necessarily preferred and no recommendation is implied.

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B The data in Table 3 are based on the rectangular integration of 44 spectral power distributions for? In tests using the same cycles and temperatures, shorter times to failure are typically observed when the lamp with higher UV irradiance is used. Maintain these conditions throughout the exposure.

Precision and Bias Parts may be accommodated depending on size. Brass, steel, or copper shall not be used in the vicinity of the test specimens. This website uses cookies to improve user experience. The spray shall be uniformly distributed over the samples.

In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure. Costs for weatherization testing will vary according to a number of factors, including moisturization, sample size, number of cycles, and more.

As shown in Fig. There are two commonly available types of UVB lamps that meet the requirements of this document. However, each of these variables brings astj inaccurate results. The total irradiance in each wavelength bandpass is then summed and divided by the speci?

Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO

B The data in Table 2 are based on the rectangular integration of 21 spectral power distributions for? This is because the UVA has a special power distribution in the short wave UV region that is similar to sunlight that has already been?

For any individual UVB lamp, the calculated percentage in each bandpass must fall within the minimum and maximum limits of Table 3. Cycles 3 and 4 have been used for exterior automotive materials. The apparatus described in G15-412 G53 is covered by this practice. For instance, a slight shift in formula may produce twice as much resistance to weathering. Alternatively, the exposure may simulate the effects of sunlight through window glass.

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By using our website you consent to all cookies in accordance with our Cookie Policy. Often several exposure times such as, and hours also will be compared to each other.

Typically, these exposures would include moisture in the form of condensing humidity. While this data is provided for comparison purposes only, it is desirable for the laboratory accelerated light source to provide a spectrum that is a close match to the benchmark solar spectrum. Last previous edition approved in as G — The shorter, more damaging UVB wavelengths are the most greatly affected.

In round-robin studies conducted by Subcommittee G Appendix X2 shows some representative exposure conditions. Use of this equation requires that each spectral interval must be the same for example, 2 nm throughout the spectral region g154-112.

ASTM G154 and G155 Explained

Xenon Arc Testing Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.

Hemispherical on 37 Tilted Surface. Refer to Practice G for full cautionary guidance applicable to all laboratory weathering devices.

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