Loctite 3321 is a transparent, light yellow, light-cured, universal, acrylic-based instant adhesive, suitable for metals and stress-sensitive plastics with a high, on-demand, curing speed. Depth of cure is >13 mm. Tack free time >30 secs. Fixturing time is 12 secs. Shore hardness: D 53. Very high viscosity of 5,500 mPa·s. ISO 10993 qualified.