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Weathering & Corrosion Weekly Webinar Series

Each webinar in the series is offered at 8 am and Noon EDT. The presentations will be 30-45 minutes in length, including Q&A. If you're unable to attend but still interested in the content, we recommend registering for either session so you'll receive the recording the following day via email.

Part 2 of the Series:

Week 16: Accelerated Outdoor Weathering Testing Using the Q-TRAC Natural Sunlight Concentrator

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    Outdoor weathering testing is the most realistic way to gain valuable information about how products will last when exposed to the elements. However, outdoor testing of highly durable materials can last 5, 10, even 20 years, longer than most product development cycles. Laboratory accelerated weathering testing is often used to bridge this gap with faster results, but correlation to real outdoor testing is still required to validate lab testing. One solution is the use of the Q-TRAC Natural Sunlight Concentrator from Q-Lab. This test instrument allows one to accelerate testing of highly weather-resistant products by delivering five times the ultraviolet (UV) light of a natural outdoor exposure while using the most realistic light spectrum available: the sun. This approach is ideal for materials like coil coatings, powder coatings, high-temperature plastics, roofing, and more.

    This webinar will cover:

    • An overview of outdoor materials weathering testing
    • A look at the Q-TRAC natural solar concentrator technology and benefits
    • The AIM Box for automotive interior testing
    • Test durations and relationship to accelerated laboratory testing
    • Test cycles and customization options available for accelerated outdoor testing
    • Materials and failure modes suitable for Q-TRAC testing

Past Webinars from this series:

Week 1: Modern Corrosion Testing

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    Corrosion damage is estimated to carry a worldwide annual cost in the trillions of dollars. Accelerated weathering testing is a powerful tool for evaluating the effectiveness of coatings, galvanization, and passivation layers in slowing down corrosion that metals experience in their service environments. This webinar presented  the history of accelerated laboratory corrosion testing, starting from the earliest continuous salt spray tests up through today’s sophisticated cyclic tests that offer improved correlation with outdoor performance.

    During this webinar, we discussed:

    • Laboratory accelerated corrosion test methods
    • Continuous Salt Spray tests like ASTM B117 and ISO 9227
    • Early Wet/Dry cyclic testing: ASTM G85 Prohesion and First-Generation Cyclic Automotive Tests
    • Types of corrosive behavior and the effect of relative humidity
    • Development of controlled relative humidity technology enabling modern corrosion test protocols
    • How modern corrosion test technology offers more realistic testing and better correlation to actual service environments

Week 2: ASTM D7869

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    ASTM D7869, Xenon Arc Exposure Test with Enhanced Light and Water Exposure for Transportation Coatings, is a breakthrough in accelerated weathering testing. Spanning over a decade of research by a team that included many prominent automotive OEMs, coatings material suppliers, and weathering specialists, the test standard delivers superior correlation to natural outdoor Florida exposures. ASTM D7869’s carefully-designed test cycle replicates nearly all outdoor degradation mechanisms, including several like blistering and adhesion loss that were not typically reproduced in historical laboratory tests.

    This short webinar took an in-depth look at this test standard, reviewed the preliminary outdoor and laboratory research that led to this test’s accurate simulation of outdoor conditions, and presented some results on a variety of coatings systems that demonstrate ASTM D7869 to be a comprehensive, correlative accelerated weathering test.

Week 3: Light Stability Testing of Home and Personal Care Products

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    Light exposure, moisture, and temperature are important causes of damage to many fast-moving consumer goods (FMCG), including cosmetics, pharmaceuticals, personal care products, and food and beverage products. These products are used in a wide variety of service environments, which can cause challenges when selecting the proper accelerated test protocol. This webinar will cover the basics of both weathering and light stability testing, specifically for FMCG. It will highlight how both fluorescent UV and xenon arc accelerated weathering devices can be equipped to simulate service environments for consumer products, and provide an in-depth look into how to run one The ICH Guidelines (ICH Q1B) of the most popular test methods for these products.

Week 4: How to Run Cyclic Corrosion Test Standard GMW 14872

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    GMW 14872, Cyclic Corrosion Laboratory Test is a modern accelerated laboratory test standard that improves significantly upon General Motors’ previous cyclic corrosion test, GM 9540P. Although that standard was used widely and included innovations such as direct application of salt solution via shower spray, the test required physical relocation of specimens during testing.

    GMW 14872 takes advantage of advances in corrosion tester technology, including the controlled relative humidity featured in instruments like the Q-FOG CRH tester. This standard builds upon the framework of GM 9540P, using of shower spray rather than fog, significant amount of time at a fixed relative humidity setting between 50 – 80%, a salt solution with low deliquescence relative humidity, and the requirement of corrosion coupons. These methods lead to a more reliable and repeatable test that better simulates a natural exposure, but also require increased operator proficiency and knowledge to be performed correctly.

    During this webinar, we reviewed the GMW 14872 standard, and explained how to successfully perform it in a Q-FOG CRH cyclic corrosion chamber.

Week 5: Water Delivery in Accelerated Weathering Testing

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    Accelerated weathering testing has been used for over a century to evaluate the outdoor performance of durable materials such as coatings. Research over the past several decades has demonstrated that many historical test standards were deficient in delivering water to test specimens, leading to their failure to reproduce water-based degradation modes. Several modern accelerated test protocols are now available that include a significant emphasis on water delivery, including EN 927-6, (fluorescent UV), ASTM D7869 (xenon arc), and ASTM G90 “Spray-2,” (outdoor accelerated solar concentrator).

    This webinar discussed the value of water delivery in accelerated weathering testing of coatings with respect to these international test standards.

Week 6: Color Change in Accelerated Weathering Testing of Plastics

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    Accelerated weathering testing using UV fluorescent and xenon arc test chambers is widely used to evaluate the weathering behavior of the physical and chemical properties of polymeric materials. A variety of test standards have been published by multiple international and other standards bodies for performing testing to simulate outdoor environments, particularly UV and visible light, high temperature, and water in the form of condensation or spray.

    This webinar provided a brief overview of accelerated weathering testing of PVC plastics and presented results on color change resulting from weathering. Significant differences in stability among different colorant types and shades were presented and explained. Correlation between laboratory testing and natural outdoor testing were discussed with respect to the ability of various test standards to reproduce realistically the forces of weathering experienced by materials outdoors.

Week 7: Lightfastness Testing of Textiles

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    Lightfastness testing is used widely to evaluate the ability of a textile to resist color change resulting from exposure to light. Exposure to light, temperature, and humidity can cause fading and/or color change in colored textile materials. These phenomena are the result of photo-chemical processes of absorbed ultraviolet (UV) and visible light, and secondary effects caused by temperature and humidity.

    In this webinar, we covered:
    • Basics of weathering and lightfastness testing
    • The use of reference materials like blue wool and red azoic dye
    • Major textile lightfastness test standards like ISO 105-B02 and AATCC TM 16
    • Selection of test architecture and test type based on materials and research goals

Week 8: Temperature Control in Accelerated Laboratory Weathering Testing of Plastics

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    Accelerated weathering testing is used widely to evaluate the performance of outdoor polymeric materials. These tests apply ultraviolet (UV) light, high temperature, and water in the form of condensation, humidity, and spray. Control of temperature during accelerated weathering testing is critical for many plastic materials, both to control the rate of photochemical degradation and to avoid unrealistic failure modes from plastics softening or even melting. Unfortunately, maintaining proper specimen temperature during accelerated weathering testing can be challenging and is often not well-understood.

    This presentation will present specimen temperature data recorded for both fluorescent UV and xenon arc accelerated weathering testers using various specimen material types and mounting configurations. Test temperatures in both types of apparatus are commonly controlled by a “black panel” reference temperature sensor and also often by specifying chamber air temperature. Data will be presented illustrating the relationship of black panel temperatures to air temperatures in weathering test chambers, differences in temperatures experienced by metal and plastic specimens, and the influence of three-dimensional specimen mounting in fluorescent UV testing.

Week 9: Visual and Colorimetric Assessments of Architectural Coatings

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    Fenestration products, such as windows, doors, and similar building components, are expected to retain their color and appearance for many years, even under harsh outdoor weather conditions. A variety of materials are used in the assembly of these items, including plastic, fiberglass, composites, and aluminum, but for each the performance requirement for coatings to maintain color is generally the same. The American Architectural Manufacturers Association (AAMA) represents the building industry and establishes the standards and criteria that are commonly used in building codes and architecture specifications. The specifications in AAMA 615, 625, & 2605, are the performance requirements that organic coatings on various substrates (plastics, thermosets, and aluminum, respectively) must meet to earn a Superior product designation. To be labeled superior, coatings must not show a ΔEH greater than 5 over the course of a 10 year outdoor exposure.

    AAMA recently nominated a working group to review relevance of the allowable color change guidelines, along with their usefulness in matching human evaluation and expectations. This presentation will review the results of that study, which included the visual and instrument evaluations of 109 weathered test panels, all varying in color and performance expectations. The task group's work also included CIELab color space and ΔE calculations, in order to determine if the legacy Hunter color space was still suitable.

Week 10: Correlation in Accelerated Weathering and Corrosion Testing 

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    Accelerated weathering and corrosion testing is widely used to rapidly evaluate the durability of materials when exposed outdoors to sunlight, heat, water, and salt. A common goal of this testing is to develop correlation between the performance of materials in the laboratory and in the field. Developing relationships between accelerated and outdoor results in the form of Acceleration Factors can be challenging due to the complexity of weathering and corrosion behavior, although a combination of outdoor and laboratory testing can help to reach that goal. An understanding of the limitations and opportunities of accelerated laboratory testing can help you get the most out of your test program.

    During this webinar, we will discuss:

    • The “myth of reciprocity” and challenges in developing numerical correlation factors between accelerated and natural testing
    • How to choose different accelerated test types for different goals, from quality control to new product development
    • Determining correlation by rank ordering
    • Case studies demonstrating correlation between outdoor and accelerated laboratory weathering and corrosion testing, including:
      • Printing inks
      • Flexible intermediate bulk containers
      • Automobile coatings
      • Vinyl siding

Week 11: Q-PANEL Standard Test Substrates

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    Protective and decorative coatings - including paints, plating, adhesives, sealants, and rust inhibitors – undergo a wide range of testing for research, development, and quality control purposes. For these tests on coatings to be reliable and reproducible, the substrates to which the coatings are applied must be reasonably consistent from test to test. This ensures that test results accurately represent the performance of the coating itself, rather than the material being coated or the interface between them.

    To meet this need, Q-Lab offers a variety of Q-PANEL steel and aluminum test substrates, recognized as the world standard for consistent and uniform test surfaces. Thousands of labs around the world use millions of these test panels every year for tests including color development, weathering exposures, salt spray and corrosion testing, physical properties testing, and quality control.

    This webinar will outline the 50-year history of the Q-PANEL, discuss standard steel and aluminium offerings, and cover the range of specialty panels available.

Week 12: Relative Humidity and Wet/Dry Transitions in Salt Spray Corrosion Tests

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    Many of the salt spray corrosion test methods developed over the last 10-15 years have included controlled relative humidity and precisely-defined transitions between wet and dry conditions. In this webinar, we will discuss why this has occurred and show some examples of test results that were significantly impacted by differences in wetting and drying rates. We will talk about the concept of deliquescence, why it is important, and how it is controlled in some of these newer test methods.

Week 13: Weathering of FIBC Materials

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    Flexible Intermediate Bulk Containers (FIBC) are used extensively in industrial environments for transportation of dry, flowable products like powders and plastics. Exposure to natural sunlight, heat and water can cause them to degrade and lose strength, so weathering testing is required to evaluate their durability.

    In this webinar, we will discuss outdoor and laboratory weathering protocols for testing weathering resistance of FIBC, including ISO 21898 for UV fluorescent devices. We will discuss recommended timing and irradiance setpoint levels for this test and present results that correlate laboratory and outdoor test results and provide useful laboratory test pass/fail criteria for 6-9 month outdoor exposure periods.

Week 14: Weathering of Vinyl Siding

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    Vinyl Siding (PVC building cladding) is a very popular architectural product used in the United States. This product was developed to last a long time outdoors, so in order to ensure quality, a comprehensive weathering testing program had to be established to find out if good correlation to long term weathering could be determined.

    This webinar will present a complete analysis of the development of the weathering program that is used, and cover some of the key findings from the over 40 years of data collected on these materials using outdoor and accelerated laboratory weathering testing.

Week 15: How to run SAE J2412 & J2527

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    Since their adoption in the late 80s, the first generation of SAE xenon-arc weathering test standards and their current successors, SAE J2412 Accelerated Exposure of Automotive Interior Trim Components Using a Controlled Irradiance Xenon-Arc Apparatus and SAE J2527 Performance Based Standard for Accelerated Exposure of Automotive Exterior Materials Using a Controlled Irradiance Xenon-Arc Apparatus, have become two of the most popular accelerated weathering tests used by the automotive industry. While the historical standards were hardware-based, requiring water-cooled xenon lamps, the current standards are both performance-based which allow a multitude of chamber designs to satisfy the standards as long as conditions are met. When first introduced, these standards provided the best methods in screening and qualifying materials, and while new standards may provide better correlation to service environment, notably ASTM D7869 for exterior coatings, the SAE xenon standards remain vastly popular and are widely accepted.

    The majority of laboratories that run either of these tests are performing a Qualification or Validation test, with the materials required to retain a degree of performance after a well-defined exposure period. Historically, this has been the requirement specified by many US automotive OEMs in order to be accepted as an approved supplier. As the suppliers are simply interested in retaining the performance criteria through the accelerated test, materials are exposed to the conditions in each stage of development, from initial research and development through full acceptance and screening.

    This webinar will focus on what is required to properly perform the standards in a Q-SUN xenon-arc weathering device. It will review which optical filters are required, black panel temperature conditions, spray criteria when appropriate, and, though no longer mandatory, the polystyrene performance tolerances.