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ACA Comments on EPA’s Proposed RMP Amendments

[…] Oct. 31 comments to EPA noted that many of the agency’s proposed amendments to the RMP rule aim to improve upon prevention program elements of particular types of facilities, promote […]

BREAKING THE ICE: The Innovative World of Icephobic Coatings

[…] coatings operate on several different levels. They can have the ability to repel water droplets, delay ice nucleation, and/or reduce ice adhesion. Icephobic performance is evaluated using two comparative test methods. The ice Centrifuge Adhesion Test (CAT) measures the adhesive failure between the ice and the surface–in other words, the force required to separate the ice buildup from the coating is measured. In this test, a bare aluminum reference and a coated aluminum sample are simultaneously iced by supercooled precipitation. The ice-adhesion shear stress is calculated from the ice-detachment rotation speed. The results are reported as the Adhesion Reduction Factor (ARF), which is the ratio of ice-adhesion stress on the bare aluminum and the ice adhesion stress on the coated sample. The second test method is the Static Ice Accumulation Test (SAT), which measures the amount of ice that accumulates on uncoated reference and coated substrates that are placed at angles of 45° and 80°. The results, reported as the Accumulation Reduction Factor (ACCRF), are the ratio of the ice mass on the bare reference sample over that of the coated sample. Fully functional icephobic coatings operate on several different levels. They can have the ability to repel water droplets, delay ice nucleation, and/or reduce ice adhesion. Over time, a wide range of ARF values, from 0.5 to 1000, have been reported, that correlate to interfacial stresses of 800 kPa and 0.5 kPa respectively.1 Several properties influence icephobicity. Hydrophobicity in particular prevents water droplets from attaching to and penetrating through the surface. Hydrophobicity is a function of water-contact angle. As shown in Figure 1, three levels of hydrophobicity are defined for contact angles >90°. FIGURE 1. Hydrophobicity as defined by liquid contact angle.2 Superhydrophic surfaces (Figure 2) have […]

ACA, Others Seek RMP Proposed Rule Comment Extension

On Oct. 4, ACA along with several other organizations asked U.S. EPA to provide a minimum 60-day extension of the comment period on EPA’s
“Accidental Release Prevention Requirements: Risk Management Programs Under the Clean Air Act; Safer Communities by Chemical Accident Prevention” proposed rule. “Given the complex nature of the policy, economic, and technical issues raised in the notice and interaction with other agency regulations, an extension would assist our organizations and other commenters in providing thoughtful, considered comments on the notice.”

2023 CoatingsTech Conference Highlights

Conference Highlights June 2628 | Cleveland, Ohio Coatings Technologies: Adaptation in a Complex World ACA’s 2023 CoatingsTech Conference was a remarkable success that brought together members of the coatings industry […]