3M™ Dual Lock™ Reclosable Fastener Information

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3M™ Dual Lock™ Introduction & Buying Guide

Basics

When two sides (sold separately) 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

3M™ Dual Lock™ Low Profile has similar features, but in a thinner version

Adhesive Guide

Material	SJ3540/41/42	SJ3550/51/52	SJ3560/61/62	SJ4570/75	SJ4580
Bare Metals	X	X	X	X	X
Painted Metals	X	X	X	X
Fiberglass	X	X	X	X
Structural Composites	X	X	X	X
Glass	X	X	X	X	X
Sealed Wood	X	X	X	X	X
Powered Paint	X			X
ABS	X	X	X	X	X
Acrylic	X	X	X	X	X
Polycarbonate	X	X	X	X	X
Rigid Vinyl	X	X	X	X	X
Plasticized Vinyl		X	X
Polyethylene	X
Polypropylene	X
Polystyrene				X	X
CARC Pain					X
Alkyd Enamel Paint					X
Painted Wood					X

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Stem Count/Types

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

Type 170 (approximately 170 stems per square inch)
Type 250 (approximately 250 stems per square inch)
Type 400 (approximately 400 stems per square inch)

170 to 250	Easy opening for multiple closures. Low enagagement force, low tensile strength.
250 to 250 or 170 to 400	*Most Common:*Medium engagement force balenced with moderate tensile strength.
250 to 400	Higher engagement force balenced with high tensile strength.
Dual Lock to Loop fastener	Quick grab engagement, high peel force,very short cycle life

See the technical bulletin on attachments (70-0709-3929-6).

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The following information is intended to assist the designer considering the use of3M™ 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.

There are typically six different methods for attaching Dual Lock™ to various surfaces. For complete details on techniques and options for attachingDual Lockor Scotchmate, please see the technical bulletin on Attaching Scotchmate and Dual Lock™ (70-0709-3929-6). The most important technique for attaching Dual Lock™SJ3540,SJ3550,SJ3551,SJ3552,SJ3560,SJ4570and SJ4580 to various materials is pressure sensitive adhesive attachment.

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 down3M™ 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 following technical information is supplied by 3M™ and data should be considered representative or typical only and should not be used for specification purposes.

This chart gives a general idea of which 3M™ Dual Lock™ adhesive side, will stick to which material.

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3M™ Dual Lock™ detailed information. (Adobe Pdf View Required)
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