Brand Bumpon Application Type Bond 1 Part or 2 Part 1-Part Material Form Bumpons Substrate Acrylic, Fabrics, Low surface energy, Polyethylene, Paper, Polystyrene, Rigid Vinyl, Foam, Glass, Bare and painted Metal, Plastics, ABS, Polycarbonate, Polypropylene, Sealed Wood, Polyethylene, Cardboard, Textured plastics Industry Medical Braces, Attaching Exhibit and Display Graphics, Attaching Exhibit and Display Graphics Manufacturer 3M Chemistry Synthetic Rubber, Rubber Based PSA Cure Method Pressure-Sensitive Color Black, Beige, White Key Specifications Mil-Spec (United States Military Standard): F-21840: MIL-F-21840, Type II and III, Class 1
Technical Data for 3M SJ3532N
- Adhesive - Bond
1 Part or 2 Part
- Low Surface Energy
- Metal - Bare and painted Metal
- Plastic - Plastics, Textured plastics
- Acrylic (PMMA) - Acrylic
- Polyethylene (LDPE, HDPE) - Polyethylene, Polyethylene
- Polystyrene (PS) - Polystyrene
- Vinyl - Rigid Vinyl
- Wood - Sealed Wood
- Fabric - Fabrics
- Paper - Cardboard
- Other - Rigid Substrates, CARC Paint, Fifficult to adhere to surfaces
- Synthetic Rubber
- Other - Rubber Based PSA
- Pressure Sensitive (min) - Pressure-Sensitive
- Brown - Beige
- Mil-Spec (United States Military Standard) : F-21840 : Type II and III, Class 1 - MIL-F-21840, Type II and III, Class 1
Peel Strength (piw) 2.6 (lb./inch width) Test Method Shear Strength (psi) 10 (pounds force/square inch) Test Method Cleavage Strength (psi) 6.0 (lbsF/sq inch) Test Method Tensile Strength (psi) 8 (pounds force/square inch) Test Method
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, Plasticized adherends
Best Practices for 3M SJ3532N
As a general rule, four square inches of fastener area per pound (57.3 square centimeters per kilogram) 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
Rounding the corners, slightly recessing the product into the adherend or providing raised edges around the reclosable fastener can reduce the possibility of edge lifting and improve the overall appearance of the fastener on the finished product. Mechanically securing the corners of the fastener with rivets, staples, screws, etc. may also reduce the possibility of edge lifting, but may reduce the closure performance.
Highly textured adherend surfaces may reduce the ultimate adhesion levels and care should be given to minimize the surface texture or roughness. Adhesive backed Scotchmate reclosable 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.
Note: It is important for the customer to follow all manufacturer’s precautions and directions for use as well as any specific government regulations or customer and supplier requirements for the method(s) used to remove any contamination on the surface of the adherend or preparing the surface for attaching the fastener(s).
In exceptional cases, especially when removing silicone mold release agents or on rough, porous surfaces, it may be necessary to sand or abrade the surface, use an adhesion promoter, or surface sealer to optimize the adhesive bond to the adherend. The selection of abrasion, priming or sealing methods will depend upon the adherends and the environmental conditions the product will be exposed to during use
To obtain an optimum bond to any surface, both the fasteners and the target surfaces should have equilibrated for a minimum of 1 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 adherend to obtain initial contact between the adhesive and adherend. Flexible adherends should be lying on a hard flat surface so as to permit uniform adhesive contact with the adherend surface. Use of a rubber hand roller, press platen or similar device is recommended to ensure full adhesive contact with the adherend surface. Approximately 4.5 pounds of force per square inch, (310 grams per square centimeter), should be adequate. For all adhesive applications, it is important to ensure that the edges are rolled down to reduce the chance of edge lifting.
3M™ Scotchmate™ Reclosable Fasteners SJ3532N and SJ3533N family of products can be attached to many fabric and foam articles by a process called heat or press bonding. The fastener is initially adhered to the article using finger pressure. The fastener is held in place with the pre-applied adhesive and bond strength is increased by applying heat and pressure through the adherend to the adhesive side of the fastener at previously determined pressure, times and heating periods. For properly chosen press bonding conditions, the product can be used immediately after cooling, usually a matter of minutes. Once applied these fasteners should not be washed or dry cleaned. Product performance will depend upon the nature of the fabric or foam as well as other conditions within any specific application. For this reason it is essential that the user evaluated the product to determine if it is fit for a particular purpose and suitable for the user’s method of application.
Scotchmate reclosable fasteners SJ3532N and SJ3533N family of products may also be mechanically attached to difficult to adhere to surfaces such as textured plastics and wood by using staples, screws, rivets and similar methods. The head of the mechanical fastener should be flat and large enough to resist pull through when the fastener is disengaged. The head of the fastener should also be recessed as much as possible below the surface of the hook or loop to prevent interference with (dis)engagement properties.
The use of resin coated chisel divergent staples appear to provide excellent attachment to thick sections of soft and hardwood surfaces.
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 disengaging. The adhesive on 3M™ Scotchmate™ Reclosable Fasteners SJ3532N and SJ3533N 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||Test Method|
|10 (pounds force/square inch)||Dynamic shear strength||ASTM D5169|
Tensile Strength Test Methods
|8 (pounds force/square inch)||Dynamic Tensile Strength|
Peel Strength Test Methods
|Peel Strength||Type||Substrate||Test Method|
|2.6 (lb./inch width)||T-Peel Strength||Flexible to Rigid||ASTM D5170|
Cleavage Strength Test Methods
|6.0 (lbsF/sq inch)||Rigid to Rigid Substrates|