3M Dual Lock Reclosable Fastener SJ3550 Datasheet 3M Dual Lock Reclosable Fastener SJ3550

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  • Description for 3M Dual Lock Reclosable Fastener SJ3550

    A positive locking, hidden fasteners designed for use in a variety of attachment solutions. They consist of continuous strips of polyolefin stems with a mushroom shaped top protruding up from the backing.

    *See Terms of Use Below

    Brand Dual Lock
    Application Type Bond
    Material Form Bumpons
    Substrate Acrylic, Glass, Bare Metal, Plastics, Polycarbonate, Sealed Wood, Polystyrene, Rigid Vinyl
    Industry Screw, Attaching window , Attching door trim panels, Rivet
    Manufacturer 3M
    Chemistry Acrylic, Polypropylene, Polyolefin
    Cure Method Pressure-Sensitive
    Color Black, White
    Total Thickness (mm) 3.510
    Double Sided Double Sided
    High Temperature Resistance (°C) 93

  • Technical Data for 3M Dual Lock Reclosable Fastener SJ3550

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    Overview
    • Application Type
    • Material Form
      • Bumpons
    • Substrate
      • Glass
      • Metal - Bare Metal
      • Plastic - Plastics
      • Acrylic (PMMA) - Acrylic
      • Polycarbonate
      • Polystyrene (PS) - Polystyrene
      • Vinyl - Rigid Vinyl
      • Wood - Sealed Wood
      • Other - Rigid Substrates, Substrates having a slight texture or surface irregularities
    • Industry
      • Mechanical Fastening Parts - Screw
      • Rivet
      • Industrial
      • Construction Window - Attaching window
      • Construction Door - Attching door trim panels
      • Other - Interior trim, Attaching accessories and equipment, Vibration and sound dampening control, Thin metal panel, Most application, A variety of attachment solutions, Multiple closure applications
    • Chemistry
      • Polyolefin
      • Acrylic
      • Other - Polypropylene
    • Application Method
      • Contact
    • Cure Method
      • Pressure Sensitive (min) - Pressure-Sensitive
    • Color
      • Black
      • White
    • Brand
      • Dual Lock
    Specifications
    Bond Strength
    Peel Strength (piw) 1.2 (N/cm), 2.5 (N/cm), 3.3 9N/cm), 2.6 (N/cm), 3.2 (N/cm), 5.4 (N/cm), 8.1 (N/cm), 8.1 (N/cm) Test Method
    Shear Strength (psi) 7, 10, 10, 28 Test Method
    Cleavage Strength (psi) 21 (N/cm), 35 (N/cm), 42 (N/cm), 56 (N/cm) Test Method
    Tensile Strength (psi) 6, 10, 10, 15, 13, 13, 20, 20, 29 Test Method
    Tape Properties
    Total Thickness (mm) 3.510
    Double Sided Double Sided
    Material Resistance
    High Temperature Resistance (°C) 93 Test Method
    Business Information
    Shelf Life Details Shelf life is from date of manufacture when stored in original packaging at 60° to 80°F (16° to 27°C) and 40 to 60% relative humidity., To obtain best performance, use this product within 24 months from date of manufacture.
    Shelf Life Temperature (°F) 140 to 176
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 24
    Not Good For
    Don't Use With Powder coated paints, Low surface energy substrates, Polypropylene, Unless surface modification, such as use of a primer, is made.

  • Best Practices for 3M Dual Lock Reclosable Fastener SJ3550

    *See Terms of Use Below

    1. Design

      Design Considerations: As a general rule, four square inches of fastener area per pound of static tensile or shear load to be supported is suggested as a starting point for evaluation. More or less area may be needed depending on specific conditions or end use applications. Type 250 Dual Lock Reclosable fasteners less than 0.75" (19 mm) width should not be engaged to other type 250 Dual Lock Reclosable fastener as low disengagement values may occur.

      Whenever possible design one side of the Dual Lock reclosable fasteners to be larger than the mating side. This will allow for variability or mismatch in Dual lock alignment positions, and ensure 100% fastening area contact. Another approach would be to design two rectangular shaped fastener pieces so that they can be engaged in a cross web/perpendicular pattern (crossed).

      Dual Lock strength is proportional to the fastening contact area, and the number of stems in combination used. More stems and more Dual Lock used gives you more strength, less stems combined and using less Dual Lock will give you less strength.

      Dual Lock disengagement strength/performance is strongest in direct tensile. Peel/cleavage mode is where it is most easily removed.

      Final product performance depends upon a combination of factors: the substrate and its surface characteristics, the fastener selected, the application method and conditions, the time and environmental conditions required for the application. Because these factors are unique to each application, the user must evaluate Dual Lock and do any testing required to determine Dual Lock’s suitability for the user’s desired end use.

    2. Surface Preparation

      The substrate surface should be cleaned to remove any surface contaminants with an appropriate cleaning method for the customer’s substrate, type and quantity of surface contaminants that need to be removed.

      Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer’s precautions and directions for use.

    3. Application

      The fasteners and substrates should have equilibrated for a minimum of one hour at temperatures of 68° to 80°F (20° to 27°C) before application. Generally these adhesive backed fasteners should be applied to surfaces that are smooth, dry and free of oils, mold release agents or other surface contaminants.

      After the substrate surface has been cleaned and dried, the liner is removed from the fastener adhesive and without touching the adhesive, the fastener’s adhesive is applied to the surface using light finger pressure. The fastener must be rolled down, to increase contact of the adhesive with the substrate’s surface. Extra care must be exercised when rolling down Dual Lock reclosable fasteners to prevent bending of the stems which can compromise the closure strength. The following two methods allow adequate pressure to be applied to the Dual Lock reclosable fastener without damaging the stems

      The first method uses a hand roller, with the roller wheel covered with a Dual Lock reclosable fastener type 170 such as 3M™ Dual Lock™ Reclosable Fastener SJ3542. The Dual Lock reclosable fastener covered roller is rolled over the Dual Lock reclosable fastener applied to the substrate, engaging and disengaging the two Dual Lock reclosable fastener pieces. The hand roller can be used for many applications.

      The second method consists of engaging a strip of plainback Dual Lock reclosable fastener type 170 such as 3M™ Dual Lock™ Reclosable Fasteners SJ3442 or SJ3742 to the previously attached adhesive backed Dual Lock reclosable fastener. The backside of the plainback material can now be rolled down using a rubber roller, with no Dual Lock reclosable fastener on the roller, fully engaging the Dual Lock reclosable fastener. After rolling down three times in each direction, the strip of plainback Dual Lock reclosable fastener can be removed and used to roll down the next piece of Dual Lock reclosable fastener in a similar manner.

    4. Curing

      The pressure-sensitive adhesive bonds to the substrate on contact and parts can be handled immediately. Adhesive bond strength increases with time, pressure and temperature. A minimum of twenty four hours dwell time is recommended before applying a load or disengaging assembled parts. Recommended time at room temperature to achieve maximum bond strength is 72 hours

    5. Testing

      The following technical information and data is intended as a guideline to assist customers in selecting 3M™ Reclosable Fasteners for further evaluation. This technical information is not product release specification or standards. Unless stated differently, the typical system performance and product properties were obtained using specific test methods under controlled laboratory conditions of 72°F

      ± 5°F and 50% ± 10% relative humidity. The user is responsible for evaluating 3M reclosable fasteners under expected use conditions to ensure suitable performance for the intended application.

      These are typical values which were gathered from testing the PSA backed materials. Similar values can be expected when the Dual Lock is held securely in a rigid fashion.

      Tests were run at 12 inches per minute.

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Cleavage Strength Test Methods
Cleavage Strength Substrate Test Method
21 (N/cm) Type 170 to 250 Width
35 (N/cm) Type 170 to 400 Rigid backed from Rigid backed
42 (N/cm) Type 250 to 250 Rigid backed from Rigid backed
56 (N/cm) Type 250 to 400 Rigid backed from Rigid backed
Peel Strength Test Methods
Peel Strength Type Substrate Test Method
1.2 (N/cm) T-Peel Adhesion Type 170 to 250 Flexible from Flexible
2.5 (N/cm) T-Peel Adhesion Type 170 to 400 Flexible from Flexible
3.3 9N/cm) T-Peel Adhesion Type 250 to 250 Flexible from Flexible
2.6 (N/cm) T-Peel Adhesion Type 250 to 400 Flexible from Flexible
3.2 (N/cm) 90° Peel Adhesion Type 170 to 250 Backing: Flexible from Rigid, notes: 12 in/min (300 mm/min)
5.4 (N/cm) 90° Peel Adhesion Type 170 to 400 Backing: Flexible from Rigid, notes: 12 in/min (300 mm/min)
8.1 (N/cm) 90° Peel Adhesion Type 250 to 250 Backing: Flexible from Rigid, notes: 12 in/min (300 mm/min)
8.1 (N/cm) 90° Peel Adhesion Type 250 to 400 Backing: Flexible from Rigid, notes: 12 in/min (300 mm/min)
Tensile Strength Test Methods
Tensile Strength Type Substrate
6 psi Dynamic Tensile (Engage) Type 170 to 250
10 psi Dynamic Tensile (Engage) Type 170 to 400
10 psi Dynamic Tensile (Engage) Type 250 to 250
15 psi Dynamic Tensile (Engage) Type 250 to 400
13 psi Dynamic Tensile (Engage) Low Profile to Low Profile
13 psi Dynamic Tensile (Disengage) Type 170 to 250
20 psi Dynamic Tensile (Disengage) Type 170 to 400
20 psi Dynamic Tensile (Disengage) Type 250 to 250
29 psi Dynamic Tensile (Disengage) Type 250 to 400
Shear Strength Test Methods
Shear Strength Type Substrate
7 psi Overlap Shear Strength Type 170 to 250
10 psi Overlap Shear Strength Type 170 to 400
10 psi Overlap Shear Strength Type 250 to 250
28 psi Overlap Shear Strength Type 250 to 400
High Temperature Resistance Test Methods
High Temperature Resistance Test Method
93°C Long Term (day, weeks)