AuroraShield™ –  PVC/Acrylic Alloy Capstock and ASA Compounds

The AuroraShield™ line includes PVC/Acrylic alloy capstocks and ASA compounds that are highly-weatherable and designed for exterior applications, such as fencing, siding, decking, arbors/pergolas, windows and doors. AuroraShield™ compounds exhibit excellent weathering stability and resistance to water whitening.

AuroraShield PVC/Acrylic alloy capstocks offer superior processability attributes. In addition to outdoor applications, AuroraShield™ ASA compounds are also ideal for building materials, automotive exterior components, roof racks, watercraft and more. Our ASA products comply with Food and Drug Administration (FDA), UL listed (UL 94), REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) and National Sanitation Foundation (NSF) standards.

Understanding UV Resistance and Weatherability

UV resistance represents the ability of a material to resist ultraviolet (UV) light present in sunlight. UV light, or sunlight, will cause non-resistant materials and surfaces to fade, discolor and degrade. Weatherability is the way that a material endures or resists exposure to weather. This encompasses moisture as well as temperature, UV and radiation.

Measuring UV Resistance and Weatherability

QUV Accelerated Weathering Tests are performed utilizing specially designed equipment. The test chamber simulates the effects of moisture and (UV) sunlight on a polymer over a given period of exposure. The QUV testing equipment can provide results in a much shorter period of time than actual outdoor weathering and attempts to replicate what can happen to materials over several months or years in actual outdoor environments.

Aurora Material Solutions utilizes equipment that not only tests materials to help improve quality and durability, but also allows us to create new products based on customers’ unmet needs. The test materials are exposed to alternating cycles of UV light (utilizing specialized UVA-340 lamps) and moisture at measured elevated temperatures. These specialized lamps accurately replicate the short-wave UV energy created by sunlight that can damage polymers.

Many might ask, “What is pass/fail for the tested materials?” Change in color on the material samples is measured by delta E*. Delta E* is a numerical value measuring color differential. The smallest value that the human eye can see is a delta E* of 1.0.

Aurora Material Solutions has dedicated research and development efforts to focus on unmet needs in the marketplace, particularly as it pertains to weathering and UV resistance of dark color exterior polymers. As a result, we consistently bring leading material technology to market in weatherable and UV-resistant polymers for exterior applications.

AuroraShield™ 4005 series of PVC/Acrylic alloys exhibit excellent accelerated weathering stability and resistance to water whitening as indicated in the following chart:

Delta – E* (Color Change)
Color QUV† Water Whitening AAMA One Year Study Results† Arizona/Ohio/Florida
Black 0.36 0.43 0.88/0.52/1.37
Medium Brown 1.66 0.85 1.33/1.80/0.97
Light Brown 0.88 0.24 0.18/0.51/0.34
Delta – E* (Color Change)
Color: Black
QUV†: 0.36
Water Whitening: 0.43
AAMA One Year Study Results† Arizona/Ohio/Florida: 0.88/0.52/1.37
Color: Medium Brown
QUV†: 1.66
Water Whitening: 0.85
AAMA One Year Study Results† Arizona/Ohio/Florida: 1.33/1.80/0.97
Color: Light Brown
QUV†: 0.88
Water Whitening: 0.24
AAMA One Year Study Results† Arizona/Ohio/Florida: 0.18/0.51/0.34

†QUV Test time is 3,000 hours with the following cycle and conditions: AAMA (American Architectural Manufacturers Association) consists of samples placed in exterior environment in Arizona, Ohio, and Florida. The following test samples represent a control color material (center), a leading ASA capstock material (right), and Aurora Material Solutions PVC/Acrylic alloy capstock (left) after 3,000 hours of testing time:

delta E* of 0.55
AuroraShield™ capstock

Control Sample Prior
to Test

delta E* of 15.22
ASA capstock

Water Whitening


Water resting on a horizontal surface at elevated temperatures, known as water submersion, may result in some whitening which is more apparent in darker colored surfaces. Aurora Material Solutions uses accelerated testing methods to compare product performance and utilizes this data, in addition to traditional QUV tests, to develop high

performance compounds for the variety of weather and real world environmental conditions.

Aurora Material Solutions has the ability to custom color match compounds with L*a*b* values.

Our experienced R&D team will work with you to develop a formulation that will meet your specific application needs. Our goal is to provide the highest quality products and the best customer service in the industry. We work closely with you throughout the process to meet your specific needs, from determining the formulation for the job, to assistance with colors and compound matching. Aurora Material Solutions strives to be our customers’ “first choice” in polymer compound solutions.