Loctite AA 3921 is a light-cured, acrylic-based adhesive formulated to provide flexible bonds when joining stress-sensitive plastics. The product offers a depth of cure 13 mm and a fixture. time of just 3 secs. Qualified to ISO 10993 for medical device applications such as bonding stainless steel cannulae into hubs, syringes and lancets for needle assemblies.