3M Dual Lock Type 250 Reclosable Fastener [Black/Acrylic Adhesive] (SJ3550): 1/2 in. x 50 yds. (Black)

3M SJ3550 Dual Lock 250 Reclosable Fastener is a general-purpose black reclosable fastener with 250 stems per square inch, an engaged thickness of 0.23 inches and a closure life of 1,000. This black fastener has mushroom-shaped stems on a polypropylene carrier which is coated with a white, general-purpose acrylic pressure-sensitive adhesive. Type 250 stem density fasteners can mate to type 170, 250 or 400 fasteners (the higher the combined number the greater the closure strength). Mushroom-shaped stems on one side of the fastener interlock with identically shaped stems on the other side for 5X greater closure strength than hook and loop. Pins: 250 per square inch. Engaged Thickness: 230 mils. Thickness: 140 mils (carrier, adhesive) 4 mils (liner). Adhesive: acrylic (300 LSE). Carrier/Backing: polypropylene. Service/Operating Temperature: up to 200F. Release Liner: clear polyolefin film. Please note: Some rolls may have a white liner with a red 3M logo, others may have a clear liner with a copper 3M logo., Weight: 0.01 pounds, Manufacturer: 3M