3M Dual Lock™

Brianna Hemphill

3M™ Dual Lock™ Reclosable Fasteners SJ3550, SJ3551 and SJ3552 consist of continuous
strips of polyolefin stems with a mushroom shaped top protruding up from the backing.
There are three types (170, 250 and 400) of these fasteners referring to the approximate
number of stems per square inch.

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