Ultra-Accelerated EMMA®/EMMAQUA®


  • Overview +

    In the 1960s Atlas DSET Laboratories pioneered accelerated outdoor weathering with its Fresnel-reflecting solar concentration devices - EMMA®(Equatorial Mount with Mirrors for Acceleration) and EMMAQUA®(Equatorial Mount with Mirrors for Acceleration with Water). In 2014, Atlas introduced its latest advancement in exposure testing, the Ultra-Accelerated EMMA (UA-EMMA).

    The UA-EMMA outdoor testing device provides approximately 10-12 years of South Florida UV radiation exposure in a single year. Atlas developed this new solar concentrator technology utilizing the same cool mirror technology used in its Ultra-Accelerated Weathering System (UAWS).

    Similar in concept to Atlas' Equatorial Mount with Mirrors for Acceleration (EMMA®) technology, the ultra-accelerated EMMA device tracks the sun while concentrating reflected sunlight on test specimens mounted in a target area. The difference however, lies in the new patented mirror system used in the UA-EMMA which has very high reflectance in the UV and near visible wavelength ranges while attenuating reflectance in the longer wavelength visible and IR portions of the solar spectrum. This leading-edge technology allows for very high concentrations of UV energy without excessive heating of test samples.

    In addition, Atlas also offers Ultra-Accelerated EMMAQUA (UA-EMMAQUA) testing. This premium outdoor weathering device has the capabilities of the UA-EMMA with an added spray feature as found in our trademark EMMAQUA®system.

    Typically, high irradiance solar concentrators or laboratory solar simulators built for ultra-high irradiance durability testing often cause test samples to overheat resulting in unnatural material changes compared to those experienced in an end-use environment. Atlas' new technology differs in that it simultaneously fulfills three requirements critical for ultra- accelerated exposure testing:

    • Allows for the exposure of many different types of materials to ultra-high UV irradiances
    • Maintains high fidelity to the natural solar UV spectrum
    • Keeps specimens at acceptable exposure temperatures

    The UA-EMMA employs twenty focusing mirrors arranged as parabolic facets, to variably concentrate UV energy on a target area approximately 15 cm X 91cm (6 inches 36 inches). UA-EMMA is also fully compliant with existing industry standards such as ASTM G90 – 10 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight.

  • Applications +

      • Adhesives
      • Agricultural Films
      • Automotive Exteriors
      • Building Materials
      • Elastomers
      • Glass (Arch. & Auto)
      • Packaging
      • Paints & Coatings
      • Plastics
      • Roofing
      • Sealants
  • Materials/Products that are ideal candidates for UA-EMMA testing +

    • Materials that require a long service life
    • Transparent and glazing materials
    • Temperature sensitive materials such as PVC
    • Coatings applied to metal panels
    • Materials that perform well in EMMA® or EMMAQUA® exposure testing
  • Standards +

    • ASTM D4364
    • ASTM G90
    • ISO 877 Method 3
    • SAE J1961
  • EMMAQUA Radiation / Duration Estimator +

  • Downloads +