• Black hook-and-loop tape with mushroom-shaped fasteners and a modified pressure-sensitive acrylic adhesive on the backing
• The version with 40 fasteners per cm² can be combined with counterparts featuring 26, 40 or 62 fasteners 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 ageing resistance
• 10 times greater holding force than hook-and-loop tape fastenings

The 3M™ Dual Lock™ Pressure-Sensitive Adhesive Tape SJ3870 consists of black polypropylene with a modified acrylic adhesive on the back. Our product is suitable for a wide range 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 opening and closing cycles. The mushroom heads slide gently over one another before interlocking under pressure to create a robust fastening. Once joined, the fastening tape remains concealed, 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, transport, specialist 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 “Click!” is probably the word 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 fastening tape slide over one another until they are anchored together by pressure. Once 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 secure. This fastening system offers 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 transport, electronics, office equipment, the engineering 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 reposition it elsewhere. This product offers a strong, concealed fastening for numerous open-close cycles, allowing you to do without screws, rivets, hooks, bolts, zips 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 fastening solution also saves money, as fewer fastening materials are required. 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 fastening and high holding power with easy separation, much like a zip. Thanks to their functional flexibility, superior aesthetics, low weight and savings on labour and installation costs, these innovative 3M fastening products are a popular and effective solution.