3M Dual Lock SJ3870

• Black hook-and-loop tape with mushroom-shaped hooks and a modified, pressure-sensitive acrylic adhesive on the back
• The version with 40 hooks per cm² can be combined with mating strips featuring 26, 40, or 62 hooks per cm²; audible click when fastened
• Five times the tensile strength compared to conventional hook-and-loop tapes
• After 1,000 open-close cycles, at least 50% of the original tensile strength remains
• Modified acrylic adhesive adheres to many plastic materials, powder-coated surfaces, and materials with low to medium surface energy
• Ideal for indoor and outdoor use on doors, flexible solar panels, skylights, access hatches, signage, and display components
• High solvent resistance
• High resistance to aging
• 10 times higher holding force than hook-and-loop tape connections

The 3M™ Dual Lock™ Pressure-Sensitive Fastening Tape SJ3870 consists of black polypropylene with a modified acrylic adhesive on the back. Our product is suitable for a wide variety of indoor and outdoor applications. It is 6.1 mm thick when closed and offers a long service life.

Repeated opening and closing for repositioning: Our remarkable 3M™ Dual Lock™ Pressure-Sensitive Fastening Tape SJ3870 retains at least 50% of its original tensile strength after 1,000 open-close cycles. The mushroom heads glide smoothly over each other before interlocking under pressure to create a robust fastening. Once joined, the fastening tape remains hidden, providing a flush surface for a smooth, clean appearance. The polyolefin fastening tape with 40 heads per cm² can be combined with counterparts featuring 26, 40, or 62 heads per cm². This allows the user to select the appropriate tensile strength depending on the application. Suitable applications: general industry, transportation, specialty vehicles, medical, military, packaging, point-of-purchase advertising solutions, exhibitions, electronics, construction, furniture, and maintenance, repair, and overhaul (MRO). The smooth backing of this flexible hook-and-loop fastener features a modified acrylic adhesive with excellent adhesion to many plastic materials (polyethylene, acrylic, polycarbonate, and ABS), powder-coated surfaces, and materials with low to medium surface energy, requiring little or no surface preparation. Audible click “Locked in!” is probably the phrase that best describes the products in our extensive 3M Dual Lock™ range. Here’s how the design works: The mushroom heads of two pieces of 3M™ Dual Lock™ hook-and-loop tape slide over each other until they are anchored together by pressure. After the opposing mushroom heads are joined, they return to their original position and snap into the opposing heads. An audible click signals that the fastener is secured. This fastening system provides holding power comparable to screws or rivets. However, the fastener can be easily opened again for repositioning. 3M Dual Lock flexible hook-and-loop fasteners are widely used in transportation, electronics, office equipment, the machinery industry, medicine, and for signage and display solutions. No screws required. Strong fastening combined with effortless removal. Simply pull the fastener apart to release it and reattach it elsewhere. This product provides a strong, hidden fastener capable of withstanding numerous open-close cycles, allowing you to eliminate screws, rivets, hooks, bolts, zippers, and other unsightly fastening methods. In short—this fastening tape is an aesthetically pleasing choice without compromising on holding power. In fact, the tensile strength of SJ3870 is five times higher than that of other 3M™ hook-and-loop tapes in comparable applications. In many cases, this fastener also saves money because fewer fastening materials are needed. Furthermore, there is no need to drill holes that could damage part or all of the object. No tools are required to connect and disconnect the flexible hook-and-loop fastener. More options for securing, fastening, and joining surfaces: 3M Dual Lock flexible hook-and-loop fasteners enable quick attachment and high holding power with easy separation, similar to a zipper. Thanks to functional flexibility, superior aesthetics, low weight, and savings in labor and installation costs, these innovative 3M fastening products are a popular and effective solution.