• Description for 3M SJ3526N

    Offer closure alternatives to zippers, screws, snaps, hooks, bolts and more. They offer greater design flexibility, faster product assembly, smoother and cleaner exterior surfaces and improved product performance in many applications. The hook and loop fasteners consist of two strips of nylon fabric which engage to form a quick fastening attachment.

    *See Terms of Use Below

    Brand Bumpon
    Application Type Bond
    1 Part or 2 Part 1-Part
    Material Form Bumpons
    Substrate Acrylic, Fabrics, Low surface energy substrates, polyethylene, Paper, Polystyrene, Rigid Vinyl, Glass, Bare and painted metal, Plastics, ABS, Polycarbonate, Polypropylene, Sealed Wood, Nylon, Polyester, Cardboard
    Industry Medical Braces, Attaching Exhibit and Display Graphics, Attaching Exhibit and Display Graphics
    Manufacturer 3M
    Chemistry Nylon 6, Rubber based PSA
    Cure Method Pressure Sensitive
    Color Black, Beige, White
    Key Specifications Mil-Spec (United States Military Standard): F-21840: Mil spec. MIL-F-21840, Type II and III, Class 1
  • Technical Data for 3M SJ3526N

    • Application Type
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Bumpons
    • Substrate
      • Low Surface Energy - Low surface energy substrates
      • Glass
      • Metal - Bare and painted metal
      • Plastic - Plastics
      • Acrylic (PMMA) - Acrylic
      • Polyethylene (LDPE, HDPE) - polyethylene
      • Polystyrene (PS) - Polystyrene
      • Vinyl - Rigid Vinyl
      • ABS
      • Polycarbonate
      • Polypropylene
      • Nylon
      • Wood - Sealed Wood
      • Fabric - Fabrics
      • Paper - Cardboard
      • Polyester
      • Other - Rigid Adherends, CARC Paint, Rigid Substrates
    • Industry
      • Displays - Attaching Exhibit and Display Graphics
      • Industrial
      • Printing and Graphics - Attaching Exhibit and Display Graphics
      • Medical - Medical Braces
      • Other - indoor applications, Anti-scratch surface, Attaching accessories and equipment, Vibration and sound dampening control
    • Chemistry
      • Nylon - Nylon 6
      • Other - Rubber based PSA
    • Application Method
      • Contact
    • Cure Method
      • Pressure Sensitive (min) - Pressure Sensitive
    • Color
      • Black
      • Brown - Beige
      • White
    • Key Specifications
      • Mil-Spec (United States Military Standard) : F-21840 : Type II and III, Class 1 - Mil spec. MIL-F-21840, Type II and III, Class 1
    • Brand
      • Bumpon
    Bond Strength
    Peel Strength (piw) 2.6 (lb./inch) Test Method
    Shear Strength (psi) 10, 4.8 (lbF/sq. in), 18 (lbF/sq. in) Test Method
    Cleavage Strength (psi) 7.9 (pounds/inch) Test Method
    Tensile Strength (psi) 8, 7.5 (lbF/sq. in), 10 (lbF/sq. in) Test Method
    Business Information
    Shelf Life Details Shelf Life when stored in original packaging at 72°F (22°C) and 50% RH
    Shelf Life Temperature (°F) 72
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 18
    Not Good For
    Don't Use With Flexible vinyl or plasticized substrates
  • Best Practices for 3M SJ3526N

    *See Terms of Use Below

    1. Design

      As a general rule, four square inches of Scotchmate reclosable fastener area per pound of static 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.

    2. Surface Preparation

      Highly textured surfaces may reduce the ultimate adhesion levels and care should be given to minimize the surface texture or roughness. Adhesive backed fasteners should be applied to surfaces that are clean, dry and free of oil, grease, dust, mold release agents or surface contaminants that could reduce the adhesion. It is recommended to remove any surface contaminants that may reduce adhesion by using a method suited for the type and quantity of surface contaminants present. Isopropal alcohol is a good general use solvent for cleaning contaminants from surfaces for example.

      In exceptional cases, especially when removing silicone mold release agents or on rough, porous surfaces, it may be necessary to lightly abrade the surface, use an adhesion promoter, or surface sealer to optimize the adhesive bond to the substrate. The selection of abrasion, priming or sealing methods will depend upon the substrates and the environmental conditions the product will be exposed to during use.

    3. Application

      Attachment Procedure: To obtain optimum bond to any surface, both the fasteners and the target surfaces should have equilibrated for a minimum of one hour at temperatures between 68°F (20°C) to 100°F (38°C) before application. The liner protecting the adhesive is removed and preferably without touching the adhesive, the fastener is applied to the substrate. Exposure of the adhesive to ambient conditions without the protective liner, before applying to the surface, should be minimized as initial adhesive tack may decrease. Flexible materials should be lying on a hard flat surface so as to permit uniform adhesive contact with the surface. Use of a rubber hand roller, press platen or similar device is recommended to ensure full adhesive contact or wetout with the substrate surface. Approximately 4.5 pounds of force per square inch, (310 grams per square centimeter) is recommended to increase adhesive contact, improving bond strength. For all adhesive applications, it is important to ensure that the edges are rolled down to reduce the chance of edge lifting.

      Plain backed: The plain backed 3M hook and loop fasteners are most commonly sewn into their applications. Liquid or hot melt adhesives and staples are other forms of attachment that can be utilized.

      Sewing: Although the selvedge edge was initially developed for stitching on, customers often find that they get better anchorage when stitching through the 3M hook and loop portions of the fastener – this may be application dependant. The type of thread and stitch type is also best determined based on individual application, however, the fastener should be stitched on all edges for the best seam strength. Typically, special machine adjustments are not necessary when using our 3M hook and loop fasteners.

    4. Curing

      Parts with properly chosen and applied pressure sensitive adhesive reclosable fasteners can be handled immediately. As the adhesive further wets-out the adherend surface, adhesive bond strength increases after application with time, pressure and/or temperature. Once attached to the adherend, a 1-hour minimum dwell time is recommended before applying a load or disengaging mated Scotchmate reclosable fastener pieces. This dwell time is important for achieving a firm adhesive bond before applying a load or using. The adhesive on 3M™ Scotchmate™ Reclosable Fasteners SJ3526N and SJ3527N family of products achieves approximately 50% of the ultimate bond strength within 20 minutes, 90% after 1 hour and the ultimate bond strength of properly applied fasteners is obtained within 24 hours at 72°F (22°C) and 50% relative humidity. Primers or adhesion promoters may reduce the time required to achieve the ultimate bond strength.

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Shear Strength Test Methods
Shear Strength Type Substrate Test Method
10 psi Dynamic shear strength ASTM D5169
4.8 (lbF/sq. in) Dynamic Closure Shear strength Nylon
18 (lbF/sq. in) Dynamic Closure Shear strength Polyester
Tensile Strength Test Methods
Tensile Strength Type Substrate
8 psi Dynamic Tensile strength
7.5 (lbF/sq. in) Dynamic Closure Tensile strength Nylon
10 (lbF/sq. in) Dynamic Closure Tensile strength Polyester
Peel Strength Test Methods
Peel Strength Type Test Method
2.6 (lb./inch) Dynamic T-Peel strength ASTM D5170
Cleavage Strength Test Methods
Cleavage Strength Substrate Test Method
7.9 (pounds/inch) Rigid to Rigid Substrates 3M™ Scotchmate™ Reclosable Fasteners SJ3526N and SJ3527N and SJ3540 are engaged with firm pressure and disengaged, peeled_x00D_ or cleaved at the rate of 12 inches (305 mm) per minute., width