Part 2 of the Series:
Week 16: Accelerated Outdoor Weathering Testing Using the Q-TRAC Natural Sunlight Concentrator
This webinar will cover:
Past Webinars from this series:
Week 1: Modern Corrosion Testing
During this webinar, we discussed:
Week 2: ASTM D7869
Week 3: Light Stability Testing of Home and Personal Care Products
Week 4: How to Run Cyclic Corrosion Test Standard GMW 14872
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.
Week 5: Water Delivery in Accelerated Weathering Testing
Week 6: Color Change in Accelerated Weathering Testing of Plastics
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
Week 8: Temperature Control in Accelerated Laboratory Weathering Testing of Plastics
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
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
During this webinar, we will discuss:
Week 11: Q-PANEL Standard Test Substrates
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
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
Week 14: Weathering of Vinyl Siding
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