Family Group

3M™ Dual Lock™ Reclosable Fastener SJ3445

Typical Performance Characteristics (continued)

90° Peel Adhesion

Substrate

3.2 N/cm width

1.8 lb/in width

Type 170 to 250

5.4 N/cm width

3.1 lb/in width

Type 170 to 400

8.1 N/cm width

4.1 lb/in width

Type 250 to 250

8.1 N/cm width

4.6 lb/in width

Type 250 to 400

Property: 90° Peel Adhesion

notes: Flexible from Rigid

Cycle Life

Substrate

1000

Type 170 to 250

1000

Type 170 to 400

1000

Type 250 to 250

1000

Type 250 to 400

Property: Cycle Life

notes: Number of closures before losing 50% of original strength

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 speci c 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.

Storage and Shelf Life

To obtain best performance, use this product within 24 months from date of manufacture.

SJ3443

SJ3444

SJ3445

Thickness (mm)

4.2

4.2

4.2