Скачать или смотреть 🔬Pull-Off Adhesion: Scoring vs. No Scoring – What's the Difference? 🤔 "Ref: Video!

🔬Pull-Off Adhesion: Scoring vs. No Scoring – What's the Difference? 🤔 "Ref: Video! 🔍

👉Non-Scoring Method: In this approach, the coating remains intact around the dolly during testing. This method preserves the coating's original state, providing a holistic measure of adhesion without introducing potential flaws from cutting.

👉Scoring Method: This technique involves making a precise incision around the dolly, cutting through the coating down to the substrate. Scoring is typically employed for thick-film, reinforced, or elastomeric coatings to ensure a defined test area and to prevent the surrounding coating from affecting the results.

🧩 Pull-Off Adhesion Insights: Scoring Techniques Decoding! 🔓

👉Reference ASTM D4541: -Scoring requirements will vary depending on coating system, chemistry, thickness and client recommendation. A direct comparison of the unscored result to a scored result is one method to determine if scoring should be performed. In general, Scoring should not be considered for coatings less than 20 mils. ✨

👉Elcometer / Instrument Manufacturer : Test have shown pull-off values are 14% higher when the coating is cut before the dolly is stuck down, compared to cut made after

Key Considerations 🔍

➡️ Coating Thickness: For coatings thicker than 20 mils (0.5 mm), scoring is often recommended to obtain accurate adhesion values. However, for thinner coatings, scoring might introduce micro-cracks, potentially compromising the test's validity.

➡️ Standard Guidelines: ASTM D4541 provides comprehensive procedures for pull-off strength testing. It emphasizes that scoring requirements vary based on the coating system, chemistry, and thickness. The standard advises that scoring should not be considered for coatings less than 20 mils thick.

Best Practices 🏆

➡️ Avoiding Micro-Cracking: When scoring is necessary, it's imperative to execute it meticulously to prevent micro-cracking in the coating or adhesive, which can lead to reduced adhesion values.

➡️ Use of Templates: Employing a template, such as a wooden guide with a hole matching the scoring tool's size, can help maintain precision and prevent lateral movements during scoring.

Standards ASTM D4541 and ISO 4624 are highly recommended.

#bggroup #bggroupofpaintandcoatingconsultant #PullOffAdhesionTest #CoatingAdhesion #ASTMD4541 #CoatingsIndustry #QualityAssurance
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