ACI Adhesive Anchor Installer Certification Practice Exam

What type of air is preferred for cleaning during adhesive installation?

1. Moist air

2. Oil-laden air

3. Oil-free compressed air

4. Warm air

The correct answer is: Oil-free compressed air

The preferred type of air for cleaning during adhesive installation is oil-free compressed air. This is crucial because oil contamination can adversely affect the bond between the adhesive and the substrate. Any oil present in the air used for cleaning can leave residues that interfere with the adhesion process, potentially leading to weak bond strength and failures in the installed anchors. Using oil-free compressed air helps ensure that the surfaces are clean and free from contaminants that could compromise the effectiveness of the adhesive. This type of air is specifically treated to remove oils, moisture, and particulates, making it ideal for applications where a clean surface is essential for optimal performance. In contrast, other types of air, such as moist air or oil-laden air, introduce the risk of contamination that can lead to subpar installations. Warm air does not inherently avoid these contaminants and may merely assist in drying surfaces but does not guarantee cleanliness in the context of securing proper adhesive bonds. Hence, oil-free compressed air is the most appropriate choice for cleaning tasks during adhesive installation.