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3M™ Optically Clear Adhesive 821X Series is for use in general purpose optical bonding including nameplates, graphic overlays, and display touch applications where very high adhesion is required. Available in 5 thicknesses: 1, 2, 3, 4, 5 mils. 3M™ Optically Clear Adhesives (OCA) are highly specialized optically clear, free-film adhesives offering superior clarity and excellent adhesion to various types of transparent substrates. 3M OCAs are easy to convert and are contaminant-free, resulting in improved bubble resistance in lamination exposed to high temperature and high humidity. 3M OCA 821X has excellent adhesion to glass.  A common application example is display bonding. Available in the following product numbers: 8211, 8212, 8213, 8214 and 8215.