ASTM G Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials. ASTM G Standard Practice for Operating Xenon Arc. Light Apparatus for UV Exposure of Nonmetallic Materials. View on Information Provider website. Engaged Expert Terry Candlish discusses ASTM G and G tests which are used to evaluate sunlight and moisture exposure. ASTM.

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See Practice G for detailed water quality instructions. See Appendix X4 for more information comparing the solar radiation data used in the standard with that for CIE 85 Table 4.

Therefore, these bulbs are useful for testing interior applications. Condensation may be produced on the face of the specimens by spraying wstm rear side of the specimens to cool them below the dew point.

ASTM Ga(General)_百度文库

Brass, steel, or copper shall not be used in the vicinity t155 the test specimens. By blasting a product with UV rays, a weatherometer can simulate exposure results. For instance, constant exposure with no temperature cycling fails to recreate the expansion and contraction stress that materials face in outdoor locations.

This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. The percentages of UV and visible irradiances on samples exposed in xenon arc devices with window glass? See Practice D for detailed guidance.


ASTM G and G Explained | Element

The glass transmission is the average for a series g155 single strength window glasses tested as part of a research study for ASTM Subcommittee G3. In round-robin studies conducted by Subcommittee G The minimum and maximum data are at least the three sigma limits from the mean for all measurements. Misleading results may be obtained by this method, since the masked portion of the specimen is still exposed to temperature and humidity that in many cases will affect results.

Historical convention has established Cycle 1 as a very commonly used exposure cycle. Link to Active This link will always route to the current Active version of the standard. Recreate specialized conditions with asfm. Make an inquiry today.

This practice is limited to awtm procedures for obtaining, measuring, and controlling conditions of exposure. Any backing used may affect test results and shall be agreed upon in advance between the interested parties. Control samples and multiple material samples produce the best comparative data.

A heat-absorbing system may be used. A number in parentheses indicates the year of last reapproval.

ASTM G154 and G155 Explained

Typically, this is done at 2 nm increments. Cycle h155 has been used for indoor plastics. Due to time constraints, however, many producers employ the G and G laboratory chamber tests for reliable exposure results in shorter time periods. Irradiance uniformity shall be determined in accordance with Practice G This website uses cookies to improve user experience.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Historical Version s – view previous versions of standard. Sstm is best practice to use control materials known to awtm relatively poor and good durability. The apparatus described in Practice G26 is covered by this practice. NOTE 1—Practice G describes performance criteria for all exposure devices that use laboratory light sources.


Very low levels of silica in spray water can cause signi? See Practice G for further guidance. A superscript epsilon e indicates an editorial change since the last revision or reapproval. It may be tempting to assume that shorter wavelengths, continuous exposure, high temperatures, and other variables can result in more intense acceleration.

B The data in Table 1 are based on the rectangular integration of spectral power distributions for water and air astmm xenon-arcs with daylight?

The round-robin shall be conducted according to Practice E or Asmt D and shall include a statistically representative sample of all laboratories or organizations who would normally conduct the exposure and property measurement. Generally, degradation processes accelerate with increasing temperature. Current edition approved Oct. Note 2 — Caution: Set point 6 operational?

Maintain these conditions throughout the exposure. Suggested minimum irradiance is 0. If the actual operating conditions do not agree with the machine settings after the X3.