3 Dual Lock Reclosable Fasteners * SJ3540 (Type 250) SJ3541 (Type 400) SJ3542 (Type 170) Technical Data November, 2002 Product Description 3M Dual Lock Reclosable Fasteners offer advanced closure alternatives to zippers, screws, snaps, hooks, bolts and more. They offer greater design flexibility, faster product assembly, smoother and cleaner exterior surfaces and improved product performance in many applications. The fasteners consist of continuous strips of polyolefin with polyolefin stems having a mushroom shaped top. The mushroom heads allow the fasteners to easily slide over each other allowing positioning of parts before they are snapped together creating a firm fastening attachment. Simply peel the pieces apart by hand to disengage. 3M Dual Lock Reclosable Fasteners SJ3540, SJ3541 and SJ3542 all contain a synthetic rubber based adhesive on a 1/32 conformable polyethylene foam backing covered by a liner. This construction allows for better contact with substrates having slight texturing or surface irregularities. This product construction is especially suited to indoor applications or where elevated temperatures are not experienced. Suggested combinations of mated fasteners are Type 170 to Type 250, Type 170 to Type 400, Type 250 to Type 250, Type 250 to Type 400, or for a quick grab attachment with high strength but limited cycle life any of the Dual Lock products can be mated with 3M Scotchmate Loop Reclosable Fasteners. See the technical bulletin on attachments (70-0709-3929-6). *Type 170 (approximately 170 stems per square inch) Type 250 (approximately 250 stems per square inch) Type 400 (approximately 400 stems per square inch) Note: The following technical information and data should be considered representative Product Construction or typical only and should not be used for specification purposes. Fastener Products Dual Lock SJ3540 Dual Lock SJ3541 Dual Lock SJ3542 (Type 250) (Type 400) (Type 170) Material of Construction Stem/Heads Polypropylene Backing Polypropylene Adhesive Synthetic Rubber on Polyethylene Foam Standard Color Black (a) Thickness unmated 15% 0.14 (3.5 mm) 0.14 (3.5 mm) 0.14 (3.5 mm) Selvedge Edges None (a) 2 2 2 Weight 0.064 oz/in 0.068 oz/in 0.057 oz/in 2 2 2 (0.28 g/cm ) (0.30 g/cm ) (0.25 g/cm ) Liner White 5 mil (0.13 mm) thick silicone treated polyolefin liner. a) All thickness and weight values are with the liner removed.TM Dual Lock Reclosable Fasteners SJ3540(Type 250) SJ3541(Type 400) SJ3542(Type 170) Note: The following technical information and data is intended as a user guide representing Typical System typical performance and should not be used for specifications. Performance Physical Properties Unless stated differently, typical performance characteristics were measured under controlled laboratory and Performance conditions of 72F (22C) and 50% Relative Humidity to obtain maximum reliability. The user should Characteristics evaluate products in the actual application to ensure suitable performance for the intended use. (a) System Performance 3M Dual Lock 3M Dual Lock Reclosable Fastener Reclosable Fastener 3M Scotchmate SJ3542 (Type 170) SJ3540 (Type 250) SJ3527 (loop) engaged to engaged to engaged to 3M Dual Lock 3M Dual Lock 3M Dual Lock Reclosable Fastener Reclosable Fastener Reclosable Fastener (b) SJ3540 (Type 250) SJ3541 (Type 400) SJ3540 (Type 250) 2 TENSILE (Rigid to Rigid Substrates) lbs /sq inch (kNewtons/m ) 72F/50% RH F Dynamic Tensile Engagement Strength 15 (103) 40 (276) <1 (<6.9) (c) Dynamic Tensile Disengagement 35 (241) 66 (455) 35 (242) 2 2 Static Tensile Holding Power Holds minimum 1.1 /in (77.5 grams/cm ) for indicated time and temperature 100F/100% RH 20,000 minutes 20,000 minutes 20,000 minutes 120F 20,000 minutes 20,000 minutes 20,000 minutes 140F 10,000 minutes 10,000 minutes 3,000 minutes 158F 1,000 minutes 1,500 minutes 275 minutes 2 SHEAR (Rigid to Rigid Substrates) lbs /sq inch (kNewtons/m ) F (c) Dynamic Shear (1 x 1 overlap) 16 (110) 43 (298) 124 (855) 2 2 Static Shear Holding Power Holds minimum 1.1 /in (77.5 grams/cm ) for indicated time and temperature 100F/100% RH 7,200 minutes 10,000 minutes 10,000 minutes 120F 10,000 minutes 10,000 minutes 10,000 minutes 140F 45 minutes 10,000 minutes 10,000 minutes 158F 33 minutes 47 minutes 1,000 minutes (c) PEEL AND CLEAVAGE Pounds/inch width (grams/cm width) Cleavage Strength (Rigid to Rigid) 17 (3040) 30 (5370) 14 (2500) Peel Strength (T Peel, Flexible to Flexible) 0.7 (125) 1.4 (250) 4.1 (730) Peel Strength (90 Peel, Flexible to Rigid) 1.8 (322) 5.4 (966) 6.1 (1090) (d) ENGAGED THICKNESS Inches (mm) Tolerance (Nominal without liner) 0.27 (6.8) 15% 0.27 (6.8) 15% 0.17 (4.4) 20% (e) CLOSURE CYCLE LIFE 1,000 1,000 50 (f) SHELF LIFE 18 months 18 months 18 months Note: Long Term Static Load: Conditions such as temperature variations, engagement area, or prolonged periods of exposure to environmental factors can affect the closure strength and long term static load performance. After engagement fasteners may slip or creep in the direction of the static load forces when subjected to static loads at temperatures or weights greater than indicated. The user is responsible for designing the amount of fastening area based upon the specific conditions for the application. Four square inches of fastening area per pound of static load is suggested as a starting point for such evaluations. a) The expected system performance of 3M Dual Lock Reclosable Fasteners is in approximately the following order of increasing strength: Dual Lock SJ3542 engaged to Dual Lock SJ3540 < (less than) Dual Lock SJ3542 engaged to Dual Lock SJ3541 (approximately equal to) Dual Lock SJ3540 engaged to Dual Lock SJ3540 < Dual Lock SJ3540 engaged to Dual Lock SJ3541. Dual Lock SJ3541 engaged to Dual Lock SJ3541 and Dual Lock SJ3542 engaged to Dual Lock SJ3542 are not recommended combinations. b) Scotchmate loop engaged to Dual Lock provides increased strength over standard 3M Scotchmate Reclosable Fasteners. 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. c) Dual Lock SJ3540, SJ3541, SJ3542 and Scotchmate SJ3527 were engaged with firm pressure and disengaged, at the rate of 12 inches (305 mm) per minute. d) Engaged thickness will decrease if a load is applied or increase if a separation force is applied. e) Cycle Life is the number of cycles (openings and closings) that the fastener is subjected to while maintaining 50% or greater of the original tensile values. f) Shelf life is from date of manufacture when stored in original packaging at 72F (22C) and 50% relative humidity. - 2 -