SJ-34xx, 35xx Dual Lock Fastening System Datasheet by 3M

Product Data Sheet

Dual Lock™

Fastening System

Product Data Sheet Updated : April 1999

Supersedes : June 1995

Product Description Dual Lock™ fastener is a

reclosable fastening system

where mushroom shaped

stems interlock with one

another when pressed

together.

Available in 25mm black or

clear, plain backed or with

rubber or acrylic self-

adhesive backing, giving

1000+ closures.

Product Number Backing Attachment Operating Temperature Features

SJ3440, Type 250 stems

SJ3441, Type 400 stems

SJ3442 Type 170 stems

Plain-backed.

Sew on or staple. -20°F - 158°F continuous

-20°F - 200°F intermittent

Wash or dry clean.

SJ3540, Type 250 stems

SJ3541 Type 400 stems

SJ3542 Type 170 stems

Pressure sensitive rubber

adhesive -20°F - 158°F continuous

-20°F - 120°F intermittent

with no static load.

General purpose.

Bonds to most surfaces.

SJ3550, Type 250 stems

SJ3551 Type 400 stems

SJ3552 Type 170 stems

Pressure sensitive very high

bond VHB™ acrylic

adhesive.

-20°F - 158°F continuous

-20°F - 200°F intermittent

High performance for aircraft,

automotive, business

equipment, electronics.

Resists harsh wet/dry,

Hot/cold cycles.

SJ3560 Type 250 stems Clear, pressure sensitive

very high bond VHB™

acrylic adhesive.

-20°F - 158°F continuous

-20°F - 200° intermittent

UV Resistant.

Plasticiser Resistant.

Clear Black

Date : April 1999

Dual Lock Fastening System

Performance

Characteristics

Dynamic Performance :

Closure Combination of Types

Property Surface 170 to 400 250 to 250 250 to 400 400 to 400 170 to loop 250 to loop

Tensile

disengagement

Lbs/sq.in.

(kPa)

Rigid

Rigid 32

(221)

Clear

(262)

Black

(207) 47

(324) 55

(380)

Peel Strength

Lbs/sq.in.

(N.100mm)

Rigid

Flexible 10

(175) 8

(140)

Fastener combinations were mated, then disengaged at a rate of 12 inches (305mm)/minute. Tests were conducted under controlled laboratory

conditions at 72°F (22°C), 50% R.H.

Static Performance : Closure Combination of Types

Property Temperatures 170 to 400 250 to 250 250 to 400 400 to 400

Static Shear.

Gram/sq.in. will hold listed

weight for 10,000 minutes.

-20°F (-29°C)

72°F (22°C)

200°F (93°C)

1,000

500

1,000

500

1,000

500

1,000

500

Static Tensile.

Gram/sq.in. will hold listed

weight for 10,000 minutes.

-20°F (-29°C)

72°F (22°C)

200°F (93°C)

1,000

500

1,000

500

1,000

500

1,000

500

Fasteners were attached to metal panels and engaged in the combinations listed. Tests were conducted at the temperatures and gram loadings

listed. Tests were discontinued after 10,000 minutes (7 days).

Static Performance : Adhesive Bond

Property Temperatures SJ3540/41/42 SJ3550/51/52 SJ3560

Static Shear.

Gram/sq.in. will hold listed

weight for 10,000 minutes.

-20°F (-29°C)

72°F (22°C)

120°F (49°C)

200°F (93°C)

1,000

500

1,000

500

1,000

500

Static Tensile.

Gram/sq.in. will hold listed

weight for 10,000 minutes.

-20°F (-29°C)

72°F (22°C)

120°F (49°C)

200°F (93°C)

1,000

500

1,000

500

1,000

500

Fasteners were attached to aluminium and stainless steel panels and engaged in the combinations listed. Tests were conducted at the

temperatures and gram loadings listed. Tests were discontinued after 10,000 minutes (7 days).

NOTE: In static load applications, conditions such as temperature variation, vibration, jarring, etc. Can affect long term performance. The user

should design the amount of fastening area based on specific conditions in the application. Four square inches of fastening area per pound of

static load is suggested as a starting point for evaluation.

Date : April 1999

Dual Lock Fastening System

Physical Properties

Contd . . .

Not for specification purposes

Plain-Backed Pressure Sensitive Adhesive-Backed

Properties SJ3440 SJ3441 SJ3442 SJ3540 SJ3541 SJ3542 SJ3550 SJ3551 SJ3552 SJ3560

Weight

g/25mm x

25mm 0.5 0.5 0.4 0.7 0.7 0.6 0.9 0.9 0.9 1.1

Colours Black Black Black Black Black Black Black Black

White

Adhesive

Black

White

Adhesive

Clear

Adhesive

Liner None None None White

Poly-

ethylene

White

Poly-

ethylene

White

Poly-

ethylene

Red

Poly-

ethylene

Red Poly-

ethylene Red

Poly-

ethylene

Red

Poly-

ethylene

Preferred

Mating

Fasteners

SJ3440

SJ3540

SJ3550

SJ3442

SJ3542

SJ3552

SJ3441

SJ3541

SJ3551

Scotch-

mate

loop

SJ3440

SJ3540

SJ3550

SJ3442

SJ3542

SJ3552

SJ3441

SJ3541

SJ3551

Scotch-

mate

loop

SJ3440

SJ3540

SJ3550

SJ3442

SJ3542

SJ3552

SJ3441

SJ3541

SJ3551

Scotch-

mate

loop

SJ3560

Engaged

Thickness mm

SJ3440

SJ3540

SJ3550

SJ3560

SJ3441

SJ3541

SJ3551

SJ3442

SJ3542

SJ3552

Scotchmate

plain loop

PSA

4.1

4.6

4.1

4.8

4.1

4.8

3.8

4.1

5.8

4.8

5.8

4.1

4.8

3.8

4.1

5.8

4.6

5.6

4.8

5.8

4.8

5.3

4.6

4.8

5.8

Shelf Life * 1 year 1 year 1 year 1 year 1 year 1 year 1 year 1 year 1 year 1 year

* 12 months from date of despatch by 3M when stored in original packaging at 70°F (21°C).

Date : April 1999

Dual Lock Fastening System

Attachment/Application Pressure-sensitive: Apply

above 20°C. Surface must

be clean, dry and free from

oil. Allow 48 hours

(SJ3541/2) or 72 hours

(SJ3551/2) for maximum

bond strength. Improved

resistance to edge peel can

be provided by recessing

the Dual Lock fastener, or

by rounding the corners. In

some exceptional cases

(contamination by mould

release, rough or porous

surfaces etc) it may be

necessary to sand or abrade

the surface, or use an

adhesive primer to optimise

bond performance.

Mechanical Attachment:

Staples or other methods of

mechanical attachment may

be used either alone

(SJ3441/2) or in conjunction

with the pressure sensitive

adhesive (SJ3541/2,

SJ3551/2) to give additional

holding strength, particularly

at elevated temperatures or

on rough or porous

surfaces.

Ultrasonic Sealing: May be

used to permanently fuse

non-adhesive products

(SJ3441/2) to themselves or

polypropylene surfaces in

about one second.

Sewing: Use extra strong

nylon, cotton-covered

polyester, or waxed cotton

thread as for buttons,

carpets, or very heavy

fabrics. Sew along all

edges with a two-thread

lock stitch, using 6-8

stitches per inch, or use a

box stitch.

Product Information Backing/Substrate Selection

Plain-Backed

Sew-On

Pressure-Sensitive Adhesive Backed

Substrates SJ3440 SJ3441 SJ3442 SJ3540 SJ3541 SJ3542 SJ3550 SJ3551 SJ3552 SJ3560

Bare Metal üüüüüü ü

Painted Metal üüüüüüü

Finished Wood üüüüüüü

Plastics : ABS üüüüüüü

Polystyrene üüüüüüü

Acrylic üüüüüüü

Polyethylene üüü

Polypropylene üüüüüü

Polycarbonate üüüüüüü

Rigid Vinyl üüüüüüü

Plasticised

Vinyl

üüü üüüü

Date : April 1999

Dual Lock Fastening System

Product Information Backing/Substrate Selection

Plain-Backed

Sew-On

Pressure-Sensitive Adhesive Backed

Fabrics üüü

Leather üüü

Paper, cardboard üüüüüüü

Rubber üüü

Glass üüüüüüü

Painted Concrete üüüüüüü

3M, Dual Lock, Scotchmate and VHB 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  3M United Kingdom PLC 1996

3M United Kingdom PLC

3M House,

28 Great Jackson Street,

Manchester,

M15 4PA

Customer Service :

Tel [3MUKP1]0161 236 8500

Fax 0161 237 1105

3M Ireland

3M House, Adelphi Centre,

Upper Georges Street,

Dun Laoghaire,Co. Dublin,

Ireland

Customer Service :

Tel (01) 280 3555

Fax (01) 280 3509

Page: 5

[3MUKP1]

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