Brand Dual Lock Application Type Bumpons Material Form Strip Substrate Acrylic, Rigid Vinyl, Polystyrene, Glass, Bare Metal, Plastics, Polycarbonate, Sealed Wood Industry Attaching window , Attching door trim panels, Rivet, Screw Manufacturer 3M Chemistry Acrylic, Polypropylene, Polyolefin Cure Method Pressure-Sensitive Color Black, White High Temperature Resistance (°C) 93
Technical Data for 3M Dual Lock Reclosable Fastener SJ3550
- Mechanical Fastening Parts - Screw
- 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
- Other - Polypropylene
- Pressure Sensitive (min) - Pressure-Sensitive
- Dual Lock
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
Total Thickness (mil) 138 Double Sided Double Sided
High Temperature Resistance (°C) 93 Test Method
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
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.
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.
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.
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
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.
Comparable Materials for 3M Dual Lock Reclosable Fastener SJ3550
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Shear Strength Test Methods
|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|
Tensile Strength Test Methods
|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|
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)|
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|
High Temperature Resistance Test Methods
|High Temperature Resistance||Test Method|
|93°C||Long Term (day, weeks)|