Dual Lock™ Low Profile
Reclosable Fastener
SJ-4570
Preliminary Product Data Sheet Updated : May 2000
Supersedes : New
Product Description 3M™ Dual Lock™ Low Profile Reclosable Fasteners can replace conventional fasteners
such as, screws, clips, rivets, snaps and bolts in many applications where items need to
be accessed or repositioned frequently. Dual Lock low profile reclosable fasteners consist
of continuous strips of plastic backing, with tiny plastic mushroom shaped stems
protruding up from the backing strip. When two pieces of Dual Lock low profile reclosable
fasteners are pressed together, thousands of “mushroom heads” interlock with one another
creating an audible snap which announces that the fastener is locked. The Dual Lock low
profile reclosable fastener is thinner allowing it to be more flexible than similar reclosable
fasteners. In addition, the Dual Lock low profile reclosable fastener offers intermediate
strength between regular Dual Lock reclosable fasteners and 3M Scotchmate™ reclosable
fasteners, with all of the advantages of a self-mating product.
Product Construction Material of
Construction Polypropylene
Backing Colour Clear
Adhesive Clear Acrylic
Liner Paper, Diecuttable
Physical Properties
Not for specification purposes Weight 0.31 grams/1”² (25mm)
Operating Temperature
Range -20°F (29°C) and up to 158°F (70°C)
Engaged Thickness ±
15% (without liner) 0.067 in. 1.7 mm
Plasticiser Resistance No
Closure Cycle Life 25-100
Cycle Life is the number of cycles (openings and closings)
that the fastener is subjected to while maintaining 50% of
the original values for tensile, shear or peel.
Shelf Life 12 months from date of manufacture when stored in
original package at 72°F (21°C) and 50% relative humidity.
2
Date : May 2000
Dual Lock Low Profile
Reclosable Fastener SJ-4570
Performance
Characteristics
Not for specification purposes
Dynamic Tensile
Engagement Strength 25.9 lbs./sq. inch (kN/m²)
Closure Performance Dynamic Tensile
Disengagement
Strength 42.4 lbs./sq. inch (kN/m²)
Dynamic Shear (1” x 1”
overlap) Strength 45.4 lbs./sq. inch (kN/m²)
Performance
Characteristics
Not for specification purposes
Dynamic 90° Peel
Adhesion 25.9 lbs./inch width (N/100mm)
Adhesive Performance Dynamic Tensile
Disengagement
Strength 42.4 lbs./sq. inch (kN/m²)
Dual Lock low profile reclosable fastener SJ-4570 was disengaged, peeled or cleaved at
the rate of 12 inches (305mm) per minute.
Note : In long term static load applications, conditions such as temperature variation,
jarring, vibration etc. can affect long term performance. The user should design
the amount of fastening area based on the specific conditions in the application.
Four square inches of fastening area per pound of static load is suggested as a
starting point for such evaluations.
Application Techniques Surfaces must be smooth, thoroughly cleaned and free of oil and surface contamination
and dry. In some exceptional cases (contamination by mould release, rough or porous
surfaces etc.) it may be necessary to sand or lightly abrade the surface. It is
recommended that the substrate be cleaned with a solvent such as isopropanol/water
solution (50/50) and allowed to dry before application of fastener.
Note : When using solvents, be sure to follow the manufacturer’s precautions and
directions for use when handling such materials.
Apply when fastener and surface temperatures are above 68°F (20°C). Remove protective
liner (avoid contamination of adhesive) and apply with uniform, firm pressure for intimate
surface contact to the substrate. Allow 72 hours dwell for maximum bond strength prior to
testing or stressing the adhesive bond. Improved resistance to edge peel can be provided
be recessing the Dual Lock low profile reclosable fastener or by rounding the corners.
General Information PRESSURE SENSITIVE ADHESIVE ATTACHMENT :
The adhesive system on SJ-4570 provides reliable bonding to a wide variety of materials
including but not limited to those listed below :
Bare Metals Many Plastics : ABS
Painted Metals Acrylic
Glass Polycarbonate
Fibreglass Polystyrene
Sealed Wood Rigid Vinyl
Structural Composites Powder Coated Paints
3
Date : May 2000
Dual Lock Low Profile
Reclosable Fastener SJ-4570
Application Ideas Backed with 300 LSE Laminating Adhesive technology, Dual Lock low profile reclosable
fasteners are designed for joining together dissimilar materials such as powder-coated
paint and hard-to-bond to surfaces as well as acrylic, wood, glass, metal, polypropylene,
foam and fibreglass. Used in Point of Purchase and Trade Show Exhibition, marine,
electronic and automotive markets, Dual Lock low profile reclosable fasteners attach
ceiling tiles, carpet, headliners, seat cushions, covers, trade show designs, access panels,
wall panels and small electronic devices.
3M, Dual Lock and Scotchmate are trademarks of the 3M Company.
Values presented have been determined by standard test methods and are average values not to be used for specification purposes.
Our recommendations on the use of our products are based on tests believed to be reliable but we would ask that you conduct your own tests to
determine their suitability for your applications.
This is because 3M cannot accept any responsibility or liability direct or consequential for loss or damage caused as a result of our
recommendations.
Tapes & Adhesives Group 3M United Kingdom PLC 2000
3M United Kingdom PLC
3M House, PO Box 1,
Market Place,
Bracknell, Berkshire,
RG12 1JU
Product Information :
Tel 0870 60 800 50
Fax 0870 60 700 99
3M Ireland
3M House, Adelphi Centre,
Upper Georges Street,
Dun Laoghaire, Co. Dublin,
Ireland
Customer Service :
Tel (01) 280 3555
Fax (01) 280 3509
