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Category Articles : Technology

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  • Monitoring of Test Tolerances

    November 30, 2022 | Dr. Oliver D Rahaeuser

    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

    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
    History of 102-18 Dry-Wet Weathering Cycle

    May 23, 2022 | Dr. Oliver D Rahaeuser

    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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  • Atlas Water air cooled what light is right cover
    Does the Cooling of the Xenon Lamp Influence Test Results?

    January 10, 2022 | Andreas Riedl

    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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  • Atlas Material and Product Testing
    The Differences Between Material and Product Testing

    September 6, 2021 | Dr. Oliver D Rahaeuser

    Durability tests and the service life predictions for materials and products that are derived from them are a challenge for every product development team. When designing a testing program, one of the first questions that you will undoubtedly ask yourself is “What is the ideal test for my material and/or product?” Answering this question is not always easy as the world of weathering and durability testing is so versatile that it can quickly become confusing. But it does not have to be and knowing the right questions to ask yourself can help to make choosing the right test method for your material or product easier.

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  • Ci-Weather-Ometer
    What is the Right Choice: Xenon Flat Tray or Rotating Rack?

    August 16, 2021 | Dr. Oliver D Rahaeuser

    For the past 50 years, xenon arc weathering has been performed mainly in two styles of instruments: flat tray and rotating rack. Each design has its advantages and disadvantages. Do you know which style is right for your test? Let’s discuss what points we should consider when trying to decide between the two.

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  • Example of front and back spray in a Ci Weather-Ometer
    The Truth About Rack Back Spray and Its Use in SAE J1960/SAE J2527

    August 2, 2021 | Oscar Cordo

    It is no secret that moisture is a major degradation mechanism for many materials. Relative humidity, rainfall, and one-off applications of water to a material’s surface all contribute to degradation in their own ways. This was recognized by Bill Lane, a member of the founding family of Atlas, through the works of Fred Stieg Jr., a paint and coatings researcher, that were published throughout the 1960’s. Stieg’s paper titled “Accelerating the Accelerated Weathering Test” from 1966 and his subsequent paper “The Dew Cycle Weather-Ometer® Re-evaluated - A Literature Review” in 1975 led to the development of the Atlas Dew Cycle Weather-Ometer®, a modified Sunshine Carbon Arc instrument with rack spray that was equipped with a chiller to enhance the formation of dew on the surface of samples under test.

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  • Surface Temperatures in Photodegradation and Weathering
    Measure Sample Surface Temperature Inside a Weather-Ometer with S3T

    July 6, 2021 | Andreas Riedl

    The measurement of individual surface temperatures with thermocouples is complex and not feasible for multiple samples especially in laboratory weathering instruments. Therefore, surface temperatures are usually neglected or only roughly estimated based on black and white standard or panel reference temperatures.

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