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3M Dual Lock Guide

3M™ Dual Lock™ Introduction & Buying Guide

The Fastener

When two sides of Dual Lock are pressed together, hundreds of mushroom-shaped stems interlock. "Snap" announces that the fastener is engaged. Compared to Hook & Loop the tensile strength is greater with 5x more holding power

Stem Count/Types

There are 3 basic types/stem counts of standard 3M™ Dual Lock™

Type 250—Stems in Wave pattern, approximately 250 stems per inch.

Type 170—wide rows, approximately 170 stems per inch.

Type 400—heads almost touching, approximately 400 stems per inch.

Dual Lock Stem Count/Mating Chart

170 to 250

Easy opening for multiple closures. Low engagement force, low tensile strength.

250 to 250 or 170 to 400

Most Common: Medium engagement force balanced with moderate tensile strength.

250 to 400

Higher engagement force balanced with high tensile strength.

Dual Lock to Loop fastener

Quick grab engagement, high peel force, very short cycle life

Adhesive Guide

SJ3540SJ3541SJ3542SJ3550SJ3551SJ3552SJ3560SJ3561SJ3562SJ4570SJ4575SJ4580SJ3870
Bare Metals
XXXXXX
Painted Metals
XXXXX
FiberglassXXXXX
Structural CompositesXXXX
GlassXXXXX
Sealed WoodXXXXXX
Powdered Coated PaintsXXX
ABSXXXXXX
AcrylicXXXXXX
PolycarbonateXXXXXX
Rigid VinylXXXXXX
Plasticized VinylXX
PolyethyleneXX (Primer Required)
PolypropyleneXX (Primer Required)
PolystyreneXXX
CARC Paint
X
Alkyd Enamel PaintX
Painted WoodXX

Dual Lock ID Guide

Shop SJ3540/41/42

Shop SJ3550/51/52

Shop SJ3560/61/62

Shop SJ3870/71/72

Low Profile:

Shop SJ4570

  • Brown liner with green print
  • Clear acrylic adhesive
  • Clear stems
  • 705 stems per inch

Shop SJ4575

  • Brown liner with green print
  • Clear acrylic adhesive
  • Black stems
  • 705 stems per inch

Shop SJ4580

  • Red liner
  • Clear LSE acrylic adhesive
  • Clear stems
  • 705 stems per inch

The following information is intended to assist the designer considering the use of 3M™ Dual Lock™ Reclosable Fasteners.Final product performance depends on actual conditions, including the fastener selected, the conditions in which the fastener is applied, the time and environmental conditions in which it is expected to perform. Because many of these factors are uniquely within the user's knowledge and control, it is required that the user evaluate the 3M™ product to determine whether it is fit for a particular purpose and suitable for the user's method of application and desired end use.

As a general rule, four square inches of 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.

Pressure Sensitive Adhesive attachment: The fasteners and substrate surfaces should have equilibrated for a minimum of 1 hour at temperatures of 68F (20C) or greater 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.

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: Be sure to follow all government regulations and the manufacturer's precautions and directions for use when using solvents or other cleaning methods.

After the substrate has been cleaned and dried, the liner is removed from the fastener's adhesive and without touching the adhesive, the fastener's adhesive is applied to the surface using light finger pressure. The fastener can then be rolled down, to increase contact of the adhesive with the substrate's surface, by one of two methods. Extra care must be exercised when rolling down 3M™ Dual Lock™ Reclosable Fasteners to prevent bending of the stems which can compromise the closure strength. The following methods allow adequate pressure to be applied to the Dual Lock™ without damaging the stems.

The first method uses a hand roller, with the roller wheel covered with a Type 170 Dual Lock™. The Dual Lock™ covered roller is rolled over the Dual Lock™ applied to the substrate, engaging and disengaging the two Dual Lock™ pieces while being rolled down.

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 one hour dwell is recommended before applying a load or disengaging assembled parts. Recommended time to achieve maximum bond strength is 24 hours.

*The technical information is supplied by 3M™ and data should be considered representative or typical only and should not be used for specification purposes.