3M™ Hook Fastener SJ3532N, Black, 1 inch x 50 yd. 3M™ Hook Fastener SJ3532N is one part of a two-part fastener solution designed to provide great durability for thousands of closures. With its medium tack rubber-based pressure sensitive adhesive backing, this fastener allows for easy and convenient attachment to a variety of substrates, including plastics. 3M™ Hook Fastener SJ3532N is our better performing rubber-based hook fastener with a 3 mil (0.08 mm) polyethylene film liner. It is an attachment alternative to a wide variety of closures, including zippers, screws, snaps, hooks and more. This fastener is covered with flexible J-shaped hooks, about 300 hooks per square inch (46 hooks/square cm.), which protrude up from a woven backing. Commonly paired with 3M™ Loop Fastener SJ3533N, this hook fastener can also engage with other 3M™ Loop Fasteners. To ensure stability and flatness, both the hook and the corresponding loop are preshrunk. The backing of 3M™ Hook Fastener SJ3532N is coated with a medium tack rubber-based pressure sensitive adhesive. This tacky adhesive bonds quickly to your substrate when pressure is applied. It features quick stick, short dwell time and good shear strength. This adhesive is designed to function with indoor applications and is suited for application to many substrates, including plastics.