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Category Articles : Technology

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  Temperature Control: Two Sensors Are Better Than One

  April 24, 2025 | Dr. Oliver D Rahaeuser

  Technology

  Xenon-arc weathering instruments use black surface temperature sensor in addition to a air temperature sensor to provide a more accurate representation of the test conditions experienced by the materials being tested. For precise testing, a xenon weathering instrument must be equipped with both sensors.

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  The Crucial Role of Purified Water

  January 31, 2025 | Dr. Oliver D Rahaeuser

  Technology

  Water is often considered a secondary factor in laboratory weathering testing, but its purity is critical to achieving reliable results and preserving the integrity of your equipment. By investing in proper water purification and adhering to industry standards, you can ensure that your tests yield accurate, reproducible outcomes while avoiding costly equipment damage.

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  Get Laboratory Specimen Preparation Right

  November 29, 2024 | Dr. Oliver D Rahaeuser

  Technology

  Getting the best out of your laboratory weathering testing depends majorly on three questions:
  1. Which is the most suitable weathering device for my product?
  2. Which is the best test method I can apply?
  3. What is the ideal test setup / specimen preparation?

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  Limitations of MH Super-UV Weathering Testing

  October 31, 2023 | Dr. Oliver D Rahaeuser

  Technology

  The concept of using powerful metal halide (MH) light sources in a weathering device goes back to the mid 1980ies. Since the MH based testers were able to deliver >20 times the natural UV irradiance, they were soon promoted as “super-UV” or “super accelerated” testers. The first MH super-UV product was sold in Japan in 1984. Until today, Japan remains the major market supplied by Japanese manufacturers SUGA and IWASAKI.

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  Studying Polymer Photo-Degradation on Molecular Level

  September 15, 2023 | Dr. Oliver D Rahaeuser

  Technology

  Before we dive into the topic, we need to briefly recap a few basics about xenon-arc weathering. Without a doubt, xenon-arc weathering is one of the most valuable tools to determine product durability and service-lifetime. Xenon-arc acceleration, i.e., the factor of how much faster the test is compared to real-life, is usually between 10 and 20 – which does not satisfy everyone’s expectations.

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  Right Light® for the Best Spectral Match to Solar UV

  June 15, 2023 | Andreas Riedl

  Technology

  Atlas Right Light® filters for Ci and Xenotest® accelerated weathering instruments provide the closest match to natural solar radiation in the critical UV wavelength region.

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  Monitoring of Test Tolerances

  November 30, 2022 | Dr. Oliver D Rahaeuser

  Technology

  Best practice for any weathering instrument is not only to record all relevant test parameters as time-dependent values. They also need to be monitored against their allowed min/max tolerances which are often specified in testing standards. These min/max tolerances are also called operational fluctuations.

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  Unique Atlas StoreLight Filter

  October 31, 2022 | Dr. Oliver D Rahaeuser

  Technology

  Today, I would like to share with you the story behind the StoreLight™ filter. This optical filter represents a unique feature in lightfastness testing, available exclusively from Atlas.

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  History of 102-18 Dry-Wet Weathering Cycle

  May 23, 2022 | Dr. Oliver D Rahaeuser

  Technology

  Today I would like to share with you one entry from the very first edition of SunSpots back from 1972. If you recall,

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  Does the Cooling of the Xenon Lamp Influence Test Results?

  January 10, 2022 | Andreas Riedl

  Technology

  For weathering applications, properly filtered xenon-arc lamps deliver state-of-the-art simulation of worst-case solar radiation in the ultraviolet (UV) and visible (VIS) wavelength range, i.e. 290 – 800 nm.

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