3M™ SJ3571 Loop Fastener Tape

3M™ SJ3571 Loop Tape: High-performance industrial Velcro-style fastening

The 3M™ SJ3571 Loop Tape is the industrial benchmark for robust and durable Velcro-style fastening. It pairs directly with 3M™ SJ3570 hook tape to form a complete attachment system.

Its nylon loop face offers reliable grip on flat surfaces, even in demanding environments. Ideal for fastening panels, cables, electronic equipment, or any demountable assembly.

Available at Dagobert Industrie, this 3M tape integrates easily into your processes thanks to its high-performance adhesive backing that is ready to apply.

What is the 3M™ SJ3571 Loop Tape?

The 3M™ SJ3571 Loop Tape is the "loop" component of an industrial mechanical fastening system. It combines with a compatible hook tape to form a high-performance Velcro-style bond.

It is a product from 3M's Dual Lock™ and Scotchmate™ range, designed for demanding environments. It withstands repeated opening and closing cycles without significant loss of performance.

Composition and structure of the SJ3571 loop tape

The SJ3571 consists of a nylon loop fabric attached to an acrylic adhesive backing. The adhesive is pressure-activated, which facilitates application on flat and rigid surfaces.

The loop side features a high density of fibers, which guarantees a firm and uniform grip over the entire contact surface.

Its main structural characteristics:

• Loop fibers made of durable nylon
• High-performance acrylic adhesive backing
• Resistance to moderate temperatures
• Compatible with 3M™ SJ3570 hooks

Product	Type	Material	Adhesive	Typical usage
3M™ SJ3571	Loops	Nylon	PSA Acrylic	Light to medium industrial fastening
3M™ SJ3570	Hooks	Nylon	PSA Acrylic	Pairs with SJ3571
3M™ SJ3550	Reinforced hooks	HD Nylon	PSA Acrylic	Heavy loads, vibrations
Velcro® Industries PS14	Loops	Polyester	PSA Acrylic	Light fastening, general use

Technical specifications and typical properties of the 3M™ SJ3571

The 3M™ SJ3571 is a loop tape designed to be assembled with hook tapes from 3M's Dual Lock™ or Scotchmate™ range. It constitutes the "loop" part of the clean-separation fastening system.

Its repositionable acrylic adhesive allows for precise placement before final fixation. It adheres to most smooth surfaces: metal, plastic, glass, paint.

The backing is made of woven polypropylene, which gives it good mechanical strength and adequate shear resistance. It supports slightly humid environments.

Typical properties of the SJ3571:

• Total thickness: approximately 1.6 mm
• Peel strength: moderate resistance, suitable for light to medium fastenings
• Operating temperature range: -10°C to +70°C
• Color: black
• Adhesive backing: pressure-sensitive acrylic

Product	Type	Backing	Max temperature	Typical usage
3M™ SJ3571	Loops	Woven polypropylene	+70°C	Light to medium fastening, indoor
3M™ SJ3572	Hooks	Nylon	+70°C	Combined with SJ3571, forms the complete system
3M™ SJ3550 (Dual Lock™)	Mushrooms	Polypropylene	+70°C	High-strength fastening, distinct separation
Velcro® Industries PS14	Loops + hooks	Nylon	+60°C	General use, light fastening

Applications and fields of use for the 3M™ SJ3571 Loop Tape

The 3M™ SJ3571 Loop Tape is the loop counterpart to the SJ3500 reclosable fastening system. It combines with the SJ3570 hook tape to create a demountable and repositionable industrial Velcro-style bond.

Its acrylic adhesive backing allows for direct mounting on smooth surfaces without drilling or screwing. Ideal wherever you want to avoid damaging the support surface.

Here are the main fields of application:

• Signage and displays: fastening panels, stands, and communication displays indoors
• Electronics and cabling: securing housings, sensors, and cable bundles on walls or rails
• Vehicle interior trim: fastening trim, carpets, and equipment in trucks, vans, or utility vehicles
• Industry and maintenance: mounting labels, small equipment, or quick-access covers on machines
• Furniture and cabinetry: temporary or permanent fastening of decorative or functional panels

The SJ3571 is suitable for rigid and slightly textured surfaces: painted metal, ABS plastic, glass, laminate wood. It withstands repeated opening and closing cycles without significant loss of adhesion.

Product	Role	Band material	Typical usage
3M™ SJ3571 (loops)	Loop counterpart	Nylon	Repositionable industrial fastening
3M™ SJ3570 (hooks)	Hook counterpart	Nylon	To be associated with SJ3571
3M™ SJ3552 (loops)	Low-thickness loop counterpart	Nylon	Light fastening, low profile
Velcro® Industries PS14	Adhesive hook/loop system	Nylon	Light to medium applications

At Dagobert Industrie, we offer the SJ3571 for all projects requiring a clean, fast, and demountable fastening solution without compromising on mechanical holding strength.

Comparison: 3M™ SJ3571 Loop Tape vs. other reclosable fastening solutions

The reclosable fastener market offers several alternatives. Here is how the 3M™ SJ3571 Loop Tape is positioned against the competition.

Comparison table of industrial loop tapes

Product	Manufacturer	Type	Shear strength	Thermal resistance	Typical usage
SJ3571	3M™	Loops (loop)	High	Up to 107°C	Indoor/outdoor industrial fastening
SJ3570	3M™	Hooks (hook)	High	Up to 107°C	Used in addition to SJ3571
SJ3560	3M™	Loops (loop)	Medium	Up to 66°C	Light applications, indoor use
Dual Lock™ SJ3550	3M™	Male/female mushrooms	Very high	Up to 66°C	Rigid fastening, moderate vibrations
Velcro® PS18	Velcro Industries	Loops (loop)	Medium	Up to 60°C	General use, office, fitting out

The SJ3571 stands out for its thermal resistance exceeding 100°C, reserving it for demanding industrial environments.
Compared to Velcro® PS18, it offers much more robust temperature and shear strength. PS18 is suitable for light applications; the SJ3571 is aimed at real production constraints.
Compared to 3M™ Dual Lock™, the SJ3571 is more flexible and adapts better to slightly irregular surfaces. Dual Lock™ remains preferable for rigid fastenings without accidental detachment.
The SJ3571 functions exclusively with its hook counterpart SJ3570: both form a coherent system, designed and tested together by 3M™.

Installation advice and best practices for the 3M™ SJ3571 Loop Tape

The 3M™ SJ3571 Loop Tape offers optimal performance provided a few simple steps are followed during installation.

Carefully prepare the surface before any application. It must be clean, dry, and degreased. A cloth soaked in isopropanol is sufficient in most cases.

The ideal application temperature is between 15°C and 38°C. Below 10°C, the adhesive hardens and initial grip is reduced. Wait for the part to return to room temperature.

Apply the tape by pressing firmly along the entire length. Running a roller or your thumb over it is sufficient to activate the acrylic adhesive. Avoid air bubbles by applying the tape gradually.

Allow a consolidation time of at least 24 hours before the first load. Maximum resistance is reached after 72 hours at room temperature.

The SJ3571 is the loop part of the Dual Lock™ system. It couples exclusively with the mushroom part, such as the SJ3570. Do not attempt to associate it with standard textile Velcro: the attachment would be insufficient.

Some best practices to remember:

• Do not apply on dusty, oily, or chalky painted surfaces
• Cut the tape with sharp scissors for clean edges
• Avoid surfaces with high curvature: prefer flat or slightly domed areas
• For outdoor use, verify compatibility with UV and humidity depending on actual conditions

FAQ - 3M™ SJ3571 Loop Tape

1. What is the 3M™ SJ3571 Loop Tape and what is it used for?

The SJ3571 is the loop part of the 3M™ Dual Lock™ reconfigurable fastening system. It combines with the mushroom part to create a solid and demountable industrial Velcro-style fastener.

It is used wherever you need to assemble, hold, or fasten two surfaces repeatedly: signage panels, electronic equipment, vehicle interior trims, industrial furniture.

2. What is the difference between SJ3571 and classic textile Velcro?

The SJ3571 is not textile Velcro. It is made of molded polypropylene, which gives it mechanical strength far superior to nylon or polyester hook-and-loop tapes.

Its engagement force is significantly higher: it is a system that clicks upon assembly. It resists vibrations, shocks, and harsh industrial environments better.

3. With which 3M™ products is the SJ3571 compatible?

The SJ3571 couples with 3M™ Dual Lock™ series SJ35xx references, including SJ3541, SJ3551, and SJ3560 (mushroom parts with varying densities).

It is also possible to assemble it with other compatible loop tapes, but the best performance is obtained by staying within the 3M™ Dual Lock™ ecosystem.

4. Does the SJ3571 tape resist heat and humidity?

Yes. The SJ3571 withstands temperatures up to about 70°C in continuous service. Its acrylic adhesive backing is formulated to hold on smooth surfaces even in humid or slightly oily environments.

It is nonetheless recommended to carefully prepare the surface before application (degreasing, drying) to ensure maximum adhesion of the self-adhesive backing.

5. How many opening/closing cycles does the SJ3571 support?

3M™ claims a durability of over 1,000 cycles of engagement/disengagement for the Dual Lock™ range. The SJ3571 retains its mechanical properties over time, unlike textile Velcros which get dirty and quickly lose their effectiveness.

This is a key argument for applications requiring frequent and repeated access: maintenance covers, demountable panels, reconfigurable cable ties.

6. On what surfaces can the SJ3571 tape be applied?

The acrylic adhesive backing is suitable for smooth, rigid, and clean surfaces: painted or bare metal, ABS plastic, polycarbonate, glass, composites. Porous or textured surfaces reduce adhesion.

For difficult surfaces, at Dagobert Industrie, we recommend using a 3M™ adhesion promoter as a supplement to maximize long-term hold.