3M Hook Fastener SJ3402
Brand Bumpon Application Type Bond Material Form Tape Substrate Nylon Hook to Nylon Loop Industry Hook fastener Manufacturer 3M Chemistry Woven nylon Cure Method Pressure Sensitive Color Black, Beige, White Total Thickness (mm) 2.000 Unmated without liner Double Sided Double Sided High Temperature Resistance (°C) 93 Durability Very durable Key Specifications CID (United States Government Commercial Item Description): CID A-A-55126A: Type II, Class 1, Mil-Spec (United States Military Standard): F-21840: MIL-F-21840, Type IA, II and III Class 3; meet the physical requirements of CID A-A-55126A, Type II, Class 1.
Technical Data for 3M Hook Fastener SJ3402
- Adhesive - Bond
- Nylon - Nylon Hook to Nylon Loop
- Mechanical Fastening Parts - Hook fastener
- Nylon - Woven nylon
- Pressure Sensitive (min) - Pressure Sensitive
- Brown - Beige
- CID (United States Government Commercial Item Description) : CID A-A-55126A : Type II, Class 1
- Mil-Spec (United States Military Standard) : F-21840 : Type IA, II and III Class 3 - MIL-F-21840, Type IA, II and III Class 3; meet the physical requirements of CID A-A-55126A, Type II, Class 1.
Peel Strength (piw) 3.5 (g/cm width), 3.9 (g/cm width) Test Method Shear Strength (psi) 10 Test Method Cleavage Strength (psi) 13.1 (g/cm width) Test Method Tensile Strength (psi) 5 Test Method
Total Thickness (mm) 2.000 Unmated without liner Double Sided Double Sided
Dimensional Stability (%) Maximum High Temperature Resistance (°C) 93
Durability Very durable
Shelf Life Details Shelf Life when stored in original packaging at 72°F (22°C) and 50% RH is 24 months. Shelf Life Temperature (°F) 72 Shelf Life (mon) 24
Best Practices for 3M Hook Fastener SJ3402
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. Isopropyl 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.
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 wet- out 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 dependent. 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.
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Cleavage Strength Test Methods
|13.1 (g/cm width)||Nylon Hook to Nylon Loop|
Peel Strength Test Methods
|Peel Strength||Type||Substrate||Test Method|
|3.5 (g/cm width)||T-Peel Adhesion||Nylon Hook to Nylon Loop||Run at 12 inches per minute. The “T” peel test only measures the closure performance per ASTM D5170 and was not adhered to aluminum panels.|
|3.9 (g/cm width)||Nylon Hook to Nylon Loop||12 in/min (300 mm/min). The 90° peel has one of the mated fasteners attached to a non-anodized aluminum panel, while the other mated fastener is not attached to an adherend and is disengaged at 90° angle during the peel.|
Tensile Strength Test Methods
|Tensile Strength||Type||Substrate||Test Method|
|5 psi||Dynamic tensile||Nylon Hook to Nylon Loop||Run at 12 inches per minute|
Shear Strength Test Methods
|Shear Strength||Type||Substrate||Test Method|
|10 psi||Overlap shear strength||Nylon Hook to Nylon Loop||Run at 12 inches per minute|