3
Dual Lock™R eclosable Fasteners
SJ3 551 (Type 400)
SJ3 552(Type 170)
SJ3 550(Type 250)
Product Description 3M™ Dual Lock™ Reclosable Fasteners SJ3550, SJ3551 and SJ3552 consist of continuous
strips of polyolefin stems with a mushroom shaped top protruding up from the backing.
There are three types (170, 250 and 400) of these fasteners referring to the approximate
number of stems per square inch.
These fasteners have a 37 mil white conformable acrylic foam adhesive providing good
contact with substrates having a slight texture or surface irregularities. The adhesive is
protected with a clear silicone treated liner allowing easy removal from the adhesive.
This product is also available in some widths with a fabricator splice which is sometimes
called a functional splice. This consists of the Dual Lock adhesive and/or the adhesive side
of the liner being spliced, thus providing product and liner continuity on the roll. These
products are designated with a FS suffix, after the SJ product number.
This product is available in some widths with a colored 3M™ Scotchmate™ Reclosable
Fastener loop splice. The Scotchmate reclosable fastener loop engaged to the Dual Lock
reclosable fastener provides for a strong splice allowing the product to be pulled through
automated converter equipment. These products are designated with a SM suffix after the
SJ product number.
A version suitable for use in clean room conditions is designated with a V suffix after the
SJ product number. This product is vacuumed to remove particles and surface contaminants
before being sealed in plastic bag to reduce the chance for contamination before use.
These Dual Lock reclosable fasteners can be mated in the following combinations of
increasing closure strength: Type 170 to Type 250, Type 250 to Type 250, Type 170 to Type
400 and Type 250 to Type 400. In some cases mating with 3M™ Scotchmate™ Reclosable
Fasteners Loop provides a quick grab - low engagement force with a high closure strength,
but reduced cycle life.
Technical Data August, 2005
Product Construction Note: The follo wing technical information and data should be considered repr esentati v e or
typical only and should not be used for specification purposes.
3M™ Dual Lock™ Reclosab le F astener
Product Number SJ3552 SJ3550 SJ3551
Type: Approx. Stems/In2(stems/cm2) 170 (26) 250 (39) 400 (62)
Material of Construction
Stem/Heads Black Polypropylene
Backing Black Polypropylene
Adhesive White 3M™ Acrylic F oam Adhesive
Thickness(a) Unmated ± 10% 0.14" (3.5 mm)
Selvedge Edges None
Liner Clear 4.0 mil (0.10 mm) thick silicone treated
polyolefin liner printed with 3M Dual Lock in red.
Weight(a) ounces/in2(grams/cm2) 0.028 (0.123) 0.030 (0.132) 0.032 (0.142)
a) All thickness and weight values are with the liner removed.
Dual LockTM R eclosable Fasteners
SJ3551(Type 400) • SJ3552 (Type 170) • SJ3550(Type 250)
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System Performance(a)
3M™ Dual Lock™ 3M™ Dual Lock™
Reclosable Fastener Reclosable Fastener 3M™ Scotchmate™
SJ3552 (Type 170) SJ3550 (Type 250) SJ3571 (loop)
engaged to engaged to engaged to
3M™ Dual Lock™ 3M™ Dual Lock™ 3M™ Dual Lock™
Reclosable Fastener Reclosable Fastener Reclosable Fastener
SJ3550 (Type 250)(b) SJ3551 (Type 400)(b) SJ3550 (Type 250)(c)
INITIAL TENSILE (Rigid to Rigid Substrates) lbsF/sq inch (kNewtons/m2)
Dynamic Tensile Engagement Strength(f) 15 (103) 40 (276) <1 (<6.9)
Dynamic Tensile Disengagement(d),(e),(g) 33 (225) 57 (395) 35 (242)
Static Tensile Holding Power Holds minimum 2.2 #/in2(155 grams/cm2) for indicated
time and temperature
100°F/100% RH 10,000 minutes 10,000 minutes 10,000 minutes
200°F 10,000 minutes 10,000 minutes 10,000 minutes
220°F 10,000 minutes 10,000 minutes 10,000 minutes
250°F 60 minutes 10,000 minutes 10,000 minutes
INITIAL SHEAR (Rigid to Rigid Substrates) lbsF/sq inch (kNewtons/m2)
Dynamic Shear (1" x 1" overlap)(d),(h) 16 (110) 43 (298) 124 (855)
Static Shear Holding Power Holds minimum 2.2 #/in2(155 grams/cm2) for indicated
(1" x 1" overlap) time and temperature
100°F/100% RH 7,200 minutes 10,000 minutes 10,000 minutes
200°F 10,000 minutes 10,000 minutes 10,000 minutes
220°F 45 minutes 10,000 minutes 10,000 minutes
250°F 33 minutes 47 minutes 1,000 minutes
PEEL AND CLEAVAGE(d) Pounds/inch width (grams/cm width)
Cleavage Strength (Rigid to Rigid) 12 (2,150) 32 (5,725) 18 (3,220)
Peel Strength (“T” Peel, Flexible to Flexible) 0.7 (125) 1.5 (268) 1.9 (340)
Peel Strength (90° Peel, Flexible to Rigid) 1.8 (322) 4.6 (823) 4.4 (787)
ENGAGED THICKNESS(i) Inches (mm) ± Tolerance
(Nominal without liner) 0.22 (5.7) ± 10% 0.22 (5.7) ± 10% 0.18 (4.6) ± 20%
CLOSURE CYCLE LIFE(j) 1,000 1,000 50
SHELF LIFE(k) 24 months 24 months 24 months
Note: Long Term Performance: Conditions such as engagement area, supported weight, forces on the closure , vibr ations or side to side movement, as w ell as
changes or prolonged exposure to environmental factors, such as temperature, ultr aviolet light or humidity and other f actors beyond the control of 3M can affect the
closure strength and long term performance. Reclosable fasteners may slip or creep in the direction of the static load forces when subjected to static loads at
temperatures, times or weights greater than indicated. The user is responsible for designing the amount of fastening area based upon the expected use conditions
for the intended application. Four square inches of engaged fastening area per pound of static load is suggested as a starting point f or such evaluations.
a)
System performance tests are determined by measuring the engaged system performance of the listed reclosable fasteners when used to join two 1/16" thick non-anodized aluminum
plates.
b)
Dual Lock reclosable fastener
type 250 (SJ3550)
engaged to type 250
(SJ3550)
and type 170
(SJ3552)
engaged to type 400
(SJ3551)
have approximately the same performance and
are appr
oximately midway between the performance of type 170 engaged to type 250 (the lowest performance recommended) and type 250 engaged to type 400 (the highest
performance recommended). Type 170 engaged to type 170 as well as type 400 engaged to type 400 are not recommended as the former is too weak and the later may be too
strong potentially causing part damage or ergonomic issues.
c) 3M™ Scotchmate Reclosable Loop Fastener engaged to Dual Lock reclosable fastener may provide increased closure strength over standard Dual Lock reclosable fastener
combinations, especially after movement or vibration of the closure system. Due to this increased strength, extra care should be given to ensure the maximum bond strength is
obtained to the substrates being joined. Failure to obtain bond strengths to the substrate that are sufficiently high may cause the fastener to release from the substrate upon
disengagement.
d) The listed reclosable fastener combinations were engaged with firm pressure and disengaged at the rate of 12 inches (305 mm) per minute.
e) Maximum tensile disengagement strength is dependent upon all of the stems disengaging at the same time with the two substrates parallel to and moving away from each other.
If sections of the Dual Lock reclosable fastener lift during disengagement, the fastener will disengage in a peel or cleavage mode, reducing the observed strength.
f) System dynamic tensile engagement strength of Dual Lock reclosable fastener SJ3552 (Type 170) to Dual Lock reclosable fastener SJ3551 (Type 400) is 29 lbsF/sq inch
(397 kNewtons/m2) and Dual Lock reclosable fastener SJ3550 (Type 250) to Dual Lock reclosable fastener SJ3550 (Type 250) is 29 lbsF/sq inch (397 kNewtons/m2).
g) System dynamic tensile disengagement strength of Dual Lock reclosable fastener SJ3552 (Type 170) to Dual Lock reclosable fastener SJ3551 (Type 400) is 50 lbsF/sq inch
(346 kNewtons/m2) and Dual Lock reclosable fastener SJ3550 (Type 250) to Dual Lock reclosable fastener SJ3550 (Type 250) is 44 lbsF/sq inch (304 kNewtons/m2).
h) System dynamic shear strength of Dual Lock reclosable fastener SJ3552 (Type 170) to Dual Lock reclosable fastener SJ3551 (Type 400) is 20 lbsF/sq inch (138 kNewtons/m2)
and Dual Lock reclosable fastener SJ3550 (Type 250) to Dual Lock reclosable fastener SJ3550 (Type 250) is 36 lbsF/sq inch (249 kNewtons/m2).
i) Engaged thickness is measured with a 1/2" diameter pressure foot with a 34 gram weight and will decrease if a load is applied or increase if a separation force is applied.
j) Cycle Life is the number of cycles (openings and closings) that the fastener is subjected to while maintaining 50% or greater of the original peel values.
k) 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.
Typical System
Performance
Characteristics
and Properties
Note: 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
specifcations 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.
Additional
Performance
Characteristics
Note: 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 specifications or standards.
Solvent Resistance: The polypropylene backing, stems with mushroom top should
resist attack by most common solvents and alkaline solutions. The adhesiv e on 3M™
Dual Lock™ Reclosable Fasteners SJ3551, SJ3552 and SJ3550 may be affected by
some common laboratory solvents and transportation fluids (gasoline, motor oil, etc.)
Tests should be conducted by the user to e valuate the solv ents and exposure time
expected for the actual application.
Plasticizer Resistance: The adhesi ve on Dual Lock reclosable fasteners SJ3551,
SJ3552 and SJ3550 has reasonable resistance to plasticizers found in many common
flexible vinyls or other materials containing high le vels of plasticizing materials.
Tests should be conducted by the user to ev aluate the plasticizer resistance for the
chosen application, environmental e xposure and duration for the actual application.
Other products to e valuate for plasticizer resistance is the family of 3M™ Dual
Lock™ Reclosable Fasteners SJ3560, SJ3550CF or 3M™ Scotchmate™ Reclosable
Fasteners SJ3522 and SJ3523.
Flammability Resistance: Dual Lock reclosable fasteners SJ3551, SJ3552 and
SJ3550 pass FMVSS 302 flammability tests when attached to a thin metal panel. If
you need reclosable fasteners that pass man y of the other standard flammability tests
(such as FAR 25.853, ASTM E-162, ASTM E-662, BSS-7239, etc.), it is suggested
that you refer to 3M Scotchmate Flame Resistant Reclosable Fasteners Data Pages
(70-0709-3976-7 and 70-0709-3978-3).
Environmental Effects: Temperatures between -20°F (-29°C) and 200°F (93°C)
should have minimal affect on closure strength. To maintain performance when
exposed for extended periods to sunlight or ultraviolet radiation these products
should be placed between two opaque or UV resistant surfaces. Specific testing
under the expected environmental conditions is recommended.
Water (Humidity) Resistance: Closure strength should not be af fected by
prolonged exposure to w ater or humidity. Once bonded to the substrate the adhesive
has high resistance to moisture under typical use conditions. Exposure to ele vated
heat and chlorine or bromine may compromise the adhesi ve performance to the Dual
Lock reclosable fastener backing.
Volatile Outgassing: Volatile outgassing, as per ASTM E595, is one important test
in determining the suitability of materials for spacecraft. Generally products with
acrylic or no adhesi v e hav e lower v olatile outgassing values. Products tested
at the Goddard Space Flight Center can be found at the follo wing web site:
http://epims.gsfc.nasa.gov/og-cgi/sectionb/sectionb html.sh.
Sterilization/Autoclaving: These Dual Lock reclosable fastener products hav e not
been tested for performance after sterilization or autoclaving processes. It is
recommended that the customer e valuate the suitability of the Dual Lock reclosable
fastener product for these characteristics typical of what is e xpected for normal usage.
Washing and Dry Cleaning: The adhesi ve present on these Dual Lock reclosable
fastener products may make them unsuitable to washing or dry cleaning processes.
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Dual LockTM R eclosable Fasteners
SJ3551(Type 400) • SJ3552 (Type 170) • SJ3550(Type 250)
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Available Sizes
Standard Widths(a) Roll Length 3M™ Dual Lock™ Reclosab le Fasteners
± 1/16" (1.6 mm) Yards (Meters) SJ3551 SJ3551V(b) SJ3552 SJ3552V SJ3550 SJ3550FS(c) SJ3550SM(d)
1/2" (12.7 mm) 50 (45.7) √–√–√(e) ––
3/4" (19 mm) 50 (45.7) √–√–√(e) ––
1" (25.4 mm) 50 (45.7) √√√√√ √ √
13/8" (31.8 mm) 50 (45.7) √–√√ √ ––
11/2" (38.1 mm) 50 (45.7) √–√√ √ ––
2" (50.8 mm) 50 (45.7) √–√√ √ √ –
3" (76.2 mm) 50 (45.7) – – – – √––
4" (101.6 mm) 50 (45.7) √–√–√––
6" (152.4 mm) 50 (45.7) √–√√ √ ––
Fabricated Forms(f) Cut Pieces
a) All of the 3M™ Dual Lock™ Reclosable Fastener SJ3551, SJ3552 and SJ3550 products are supplied on 3" core with the
liner to the edge of the adhesive. There are no extended liners or selvedge edge with any of the standard products listed
above.
b) V is the identical SJ product construction except the product is vacuumed to remove debris and packaged in a plastic
bag to reduce particle contamination. Useful for cleanroom applications.
c) FS is the identical SJ product construction, except the liner and product are each spliced to provide a continuous product.
d) SM is the identical SJ product construction except the Dual Lock reclosable fastener is spliced with a colored 3M™
Scotchmate™ Reclosable Fastener loop, providing a strong splice for pulling through automated converting equipment.
e) It is not recommended to engage Dual Lock reclosable fastener type 250 to type 250 (Dual Lock reclosable fastener
SJ3550 to SJ3550 for widths of 0.75" or narrower.
f) Reclosable fasteners can be fabricated in many custom shapes and sizes to fit your product design and manufacturing
process. Contact your local 3M authorized distributor, converter or 3M representative for additional options,
configurations and ordering information.
Attachment
Techniques The follo wing information is intended to assist the customer in selecting and using an
appropriate attachment option for their application. Final product performance depends upon a
number of factors, the substrate and its surface characteristics, including the f astener selected,
the method in which the fastener is applied, the time and environmental conditions in which it is
expected to perform. Because man y of these f actors are uniquely within the user’s knowledge
and control, it is required that the user e valuate the 3M product to determine whether it is f it for
a particular purpose and suitable for the user’s method of application and desired end use.
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 e valuation. More
or less area may be needed depending on specific conditions or end use applications. Type 250
Dual Lock reclosable fastener 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.
Rounding the corners, recessing the product into the substrate and providing raised edges
around the Dual Lock reclosable fastener can reduce the possibility of edge lifting or catching
that may cause the fastener to be torn from the substrate, while impro ving the overall
appearance of the fastener on the finished product. Mechanically securing the corners of the
Dual Lock reclosable fastener can also reduce the possibility of edge lifting, but may reduce
the closure performance.
It is recommended that pieces of Dual Lock reclosable fastener be engaged to pieces or strips
of Dual Lock reclosable fastener. Strips of Dual Lock reclosable fastener should not be
engaged to strips of Dual Lock reclosable fastener as low disengagement may occur from
incomplete engagement along the full strip. Pieces or strips of Dual Lock reclosable fastener
can be engaged to pieces or strips of Scotchmate reclosable fastener loop.
Dual LockTM R eclosable Fasteners
SJ3551(Type 400) • SJ3552 (Type 170) • SJ3550(Type 250)
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Application
Ideas 3M™ Dual Lock™ Reclosable Fasteners SJ3551, SJ3552 and SJ3550 can replace conventional
mechanical fasteners in a wide range of assembly and attachment applications where reclosability
is desired. They provide a firm adhesive bond to a wide variety of surf aces, including, but not
limited to those listed belo w. Because product performance will depend on actual conditions
within any specific application, it is essential that the user ev aluate the 3M product to determine
whether it is fit for a particular material purpose and suitable for the user’s method of application.
Plastics
Glass Sealed Wood Acrylic Rigid Vinyl
Bare Metal Polycarbonate Polystyrene
Not suitable for powder coated paints and low surface energy substrates such as polypropylene, unless
surface modification, such as use of a primer, is made.
Dual Lock reclosable fasteners SJ3551, SJ3552 and SJ3550 have shown to be useful for:
Attaching windo w and door trim panels Attaching accessories and equipment
Interior trim Vibration and sound dampening control
Attachment
Techniques
(continued)
Attachment Methods: There are typically six dif ferent methods for attaching 3M™ Dual Lock™
Reclosable F astener to various substrates. F or complete details on techniques and options for
attaching Dual Lock or Scotchmate reclosable fasteners, please see the techincal bulletin on
Attaching Scotchmate and Dual Lock reclosable fasteners (70-0709-3929-6). The most important
technique for attaching Dual Lock reclosable fasteners SJ3551, SJ3552 and SJ3550 to various
substrates is use of its pressure sensiti ve adhesive.
Pressure Sensitiv e Adhesive attachment: The f asteners and substrates should hav e equilibrated
for a minimum of one hour at temperatures of 68° to 80°F (20° to 27°C) before application.
Generally these adhesi ve backed f asteners 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 remo v e any surface contaminants with an appropriate
cleaning method for the customer’s substrate, type and quantity of surface contaminants that need to
be remov ed. Note: When using solvents, extinguish all ignition sources, including pilot lights, and
follo w the manuf acturer’s precautions and directions for use.
After the substrate surface has been cleaned and dried, the liner is remo ved from the fastener
adhesi ve and without touching the adhesive, the f astener’s adhesive is applied to the surface using
light finger pressure. The fastener must be rolled do wn, to increase contact of the adhesive with
the substrate’s surface. Extra care must be ex ercised when rolling down Dual Lock reclosable
fasteners to prevent bending of the stems which can compromise the closure strength. The
follo wing two methods allo w 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 co vered 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
adhesi ve backed Dual Lock reclosable f astener. The backside of the plainback material can now be
rolled do wn 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 remo ved and used to roll down the next
piece of Dual Lock reclosable fastener in a similar manner.
The pressure-sensiti ve 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 achie ve maximum bond strength is 72 hours.
Dual LockTM R eclosable Fasteners
SJ3551(Type 400) • SJ3552 (Type 170) • SJ3550(Type 250)
MSDS: 3M has not prepared a MSDS for this product which is not subject to the MSDS requirements of
the Occupational Safety and Health Administration’s Hazard Communication Standard, 29 C.F.R.
1910.1200(b)(6)(v). When used under reasonable conditions or in accordance with the 3M directions for
use, the product should not present a health and safety hazard. However, use or processing of the
product in a manner not in accordance with the directions for use may affect its performance and present
potential health and safety hazards.
TSCA: This product is defined as an article under the Toxic Substances Control Act and therefore, it is
exempt from inventory listing requirements.
FMVSS 302: 3M™ Dual Lock Reclosable Fasteners SJ3551, SJ3552 and SJ3550 pass FMVSS 302
flammability tests when attached to a thin metal panel.
Certification/
Recognition
Printed in U.S .A.
©3M 2005 70-0709-3986-6 (8/05)
Recycled Paper
40% pr e-consumer
10% post-consumer
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Dual LockTM R eclosable Fasteners
SJ3551(Type 400) • SJ3552 (Type 170) • SJ3550(Type 250)
All statements, technical information and recommendations contained in this document are based upon
tests or experience that 3M believes are reliable. However, many factors beyond 3M’s control can affect
the use and performance of a 3M product in a particular application, including the conditions under
which the product is used and the time and environmental conditions in which the product is expected to
perform. Since these factors are uniquely within the user’s knowledge and control, it is essential 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.
Product Use
Unless stated otherwise in 3M’s product literature, packaging inserts or product packaging f or individual
products, 3M warrants that each 3M product meets the applicable specifications at the time 3M ships the
product. Individual products may hav e additional or different warranties as stated on product literature,
package inserts or product packages. 3M MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE OR ANY IMPLIED WARRANTY ARISING OUT OF A COURSE OF
DEALING, CUST OM OR USAGE OF TRADE. User is responsib le for determining whether the 3M product
is fit for a particular purpose and suitable for user’s application. If the 3M product is defectiv e within the
warranty period, your exclusive remedy and 3M’s and seller’s sole obligation will be, at 3M’s option, to
replace the product or refund the purchase price.
Warranty and
Limited Remedy
Except where prohibited by law, 3M and seller will not be liable for any loss or damage arising from the
3M product, whether direct, indirect, special, incidental or consequential, regardless of the legal theory
asserted, including warranty, contract, negligence or strict liability.
Limitation of Liability
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system
registered to ISO 9001:2000 and ISO/TS 16949:2002 standards.
ISO 9001:2000 - ISO/TS 16949:2002
3
Industrial Business
Industrial Adhesives and Tapes Division
3M Center, Building 21-1W-10, 900 Bush Avenue
St. Paul, MN 55144-1000
800-362-3550 • 877-369-2923 (fax)
www.3M.com/industrial
