Dual LockTM Fastening System Product Data Sheet Updated : April 1999 Supersedes : June 1995 Product Description Product Number SJ3440, Type 250 stems Dual LockTM 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 selfadhesive backing, giving 1000+ closures. Backing Attachment Operating Temperature Features Plain-backed. Sew on or staple. -20F - 158F continuous Wash or dry clean. SJ3441, Type 400 stems -20F - 200F intermittent SJ3442 Type 170 stems SJ3540, Type 250 stems Pressure sensitive rubber adhesive SJ3541 Type 400 stems -20F - 158F continuous General purpose. Bonds to most surfaces. -20F - 120F intermittent with no static load. SJ3542 Type 170 stems SJ3550, Type 250 stems SJ3551 Type 400 stems Pressure sensitive very high bond VHBTM acrylic adhesive. -20F - 158F continuous -20F - 200F intermittent SJ3552 Type 170 stems SJ3560 Type 250 stems Clear, pressure sensitive very high bond VHBTM acrylic adhesive. -20F - 158F continuous -20F - 200 intermittent High performance for aircraft, automotive, business equipment, electronics. Resists harsh wet/dry, Hot/cold cycles. UV Resistant. Plasticiser Resistant. 2 Date : April 1999 Dual Lock Fastening System Performance Characteristics Dynamic Performance : Closure Property Surface Tensile disengagement Lbs/sq.in. (kPa) Rigid to Rigid Peel Strength Lbs/sq.in. (N.100mm) Rigid to Flexible Combination of Types 170 to 400 32 (221) 250 to 250 Clear Black 38 (262) 30 (207) 250 to 400 400 to 400 47 (324) 55 (380) 170 to loop 250 to loop 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 72F (22C), 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. -20F (-29C) 72F (22C) 200F (93C) 1,000 1,000 500 1,000 1,000 500 1,000 1,000 500 1,000 1,000 500 Static Tensile. Gram/sq.in. will hold listed weight for 10,000 minutes. -20F (-29C) 72F (22C) 200F (93C) 1,000 1,000 500 1,000 1,000 500 1,000 1,000 500 1,000 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. -20F (-29C) 72F (22C) 120F (49C) 200F (93C) 1,000 1,000 500 - 1,000 1,000 1,000 500 1,000 1,000 1,000 500 Static Tensile. Gram/sq.in. will hold listed weight for 10,000 minutes. -20F (-29C) 72F (22C) 120F (49C) 200F (93C) 1,000 1,000 500 - 1,000 1,000 1,000 500 1,000 1,000 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. 3 Date : April 1999 Dual Lock Fastening System Not for specification purposes Physical Properties Contd . . . 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 Clear Adhesive Liner None None None White Polyethylene White Polyethylene White Polyethylene Red Polyethylene Red Polyethylene Red Polyethylene Red Polyethylene SJ3440 SJ3540 SJ3550 SJ3442 SJ3542 SJ3552 SJ3441 SJ3541 SJ3551 Scotchmate loop SJ3440 SJ3540 SJ3550 SJ3442 SJ3542 SJ3552 SJ3441 SJ3541 SJ3551 Scotchmate loop SJ3440 SJ3540 SJ3550 SJ3442 SJ3542 SJ3552 SJ3441 SJ3541 SJ3551 Scotchmate loop SJ3560 4.6 4.8 5.8 5.8 5.8 Preferred Mating Fasteners Engaged Thickness mm SJ3440 SJ3540 SJ3550 SJ3560 SJ3441 SJ3541 SJ3551 SJ3442 SJ3542 SJ3552 Scotchmate plain loop PSA Shelf Life * 4.1 5.8 5.8 4.6 4.1 4.8 4.8 4.1 4.8 4.8 1 year 4.6 3.8 4.1 4.8 5.3 5.8 1 year 1 year 5.6 4.8 5.8 5.8 4.8 5.8 5.8 3.8 4.1 1 year 4.1 4.8 4.8 1 year 1 year 1 year 1 year * 12 months from date of despatch by 3M when stored in original packaging at 70F (21C). 1 year 1 year 4 Date : April 1999 Dual Lock Fastening System Pressure-sensitive: Apply above 20C. 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. Attachment/Application Product Information 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. 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. Ultrasonic Sealing: May be used to permanently fuse non-adhesive products (SJ3441/2) to themselves or polypropylene surfaces in about one second. Backing/Substrate Selection Plain-Backed Pressure-Sensitive Adhesive Backed Sew-On Substrates SJ3540 SJ3541 SJ3542 SJ3550 SJ3551 SJ3552 SJ3560 Bare Metal u u u u u u u Painted Metal u u u u u u u Finished Wood u u u u u u u Plastics : ABS u u u u u u u Polystyrene u u u u u u u Acrylic u u u u u u u Polyethylene u u u u u u Polycarbonate u u u u u u u Rigid Vinyl u u u u u u u u u u u Polypropylene Plasticised Vinyl SJ3440 u u SJ3441 u u SJ3442 u u 5 Date : April 1999 Dual Lock Fastening System Product Information Backing/Substrate Selection Plain-Backed Pressure-Sensitive Adhesive Backed Sew-On Fabrics u u u Leather u u u u u u u u u u Glass u u u u u u u Painted Concrete u u u u u u u Paper, cardboard Rubber u u u 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. 3M United Kingdom PLC 1996 Tapes & Adhesives 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]