3M SJ3550

3M SJ3550 Datasheet
  • Description for 3M SJ3550

    Consists 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.

    *See Terms of Use Below

    Brand Bumpon
    Application Type Bumpons
    1 Part or 2 Part 1 Part
    Material Form Strip
    Substrate Acrylic, Rigid Vinyl, Polystyrene, Glass, Bare Metal, Plastics, Polycarbonate, Sealed Wood
    Industry Attaching window , Attching door trim panels
    Manufacturer 3M
    Chemistry Acrylic, Polypropylene
    Cure Method Pressure-Sensitive
  • Technical Data for 3M SJ3550

    Overview
    • Application Type
      • Bumpons
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Strip
    • Substrate
      • Glass
      • Metal - Bare Metal
      • Plastic - Plastics
      • Acrylic (PMMA) - Acrylic
      • Vinyl - Rigid Vinyl
      • Polystyrene (PS) - Polystyrene
      • Polycarbonate
      • Wood - Sealed Wood
      • Other - Rigid Substrates, Substrates having a slight texture or surface irregularities
    • Industry
      • Industrial
      • Construction Window - Attaching window
      • Construction Door - Attching door trim panels
      • Other - Interior trim, Attaching accessories and equipment, Vibration and sound dampening control, Thin metal panel.
    • Chemistry
    • Application Method
      • Contact
    • Cure Method
      • Pressure Sensitive (min) - Pressure-Sensitive
    • Brand
      • Bumpon
    Specifications
    Bond Strength
    Peel Strength (piw) 4.6 (Pounds/inch), 1.5 (Pounds/inch) Test Method
    Shear Strength (psi) 43 (lbs(F)/sq inch), 155 (grams/cm2), 155 (grams/cm2), 155 (grams/cm2), 155 (grams/cm2) Test Method
    Cleavage Strength (psi) 32 (pounds/inch) Test Method
    Tensile Strength (psi) 155 (grams/cm2), 155 (grams/cm2), 155 (grams/cm2), 155 (grams/cm2), 40, 57 Test Method
    Business Information
    Shelf Life Details 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.
    Shelf Life Temperature (°F) 140 to 176
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 24
    Not Good For
    Don't Use With Powder coated paints, Low surface energy substrates, Polypropylene, Unless surface modification, such as use of a primer, is made.
  • Best Practices for 3M SJ3550

    *See Terms of Use Below

    1. Design

      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 evaluation. 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 improving 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.

    2. Surface Preparation

      The substrate surface should be cleaned to remove any surface contaminants with an appropriate cleaning method for the customer’s substrate, type and quantity of surface contaminants that need to be removed.

      Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer’s precautions and directions for use.

    3. Application

      The fasteners and substrates should have equilibrated for a minimum of one hour at temperatures of 68° to 80°F (20° to 27°C) before application. Generally these adhesive backed fasteners should be applied to surfaces that are smooth, dry and free of oils, mold release agents or other surface contaminants.

      After the substrate surface has been cleaned and dried, the liner is removed from the fastener adhesive and without touching the adhesive, the fastener’s adhesive is applied to the surface using light finger pressure. The fastener must be rolled down, to increase contact of the adhesive with the substrate’s surface. Extra care must be exercised when rolling down Dual Lock reclosable fasteners to prevent bending of the stems which can compromise the closure strength. The following two methods allow 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 covered 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 adhesive backed Dual Lock reclosable fastener. The backside of the plainback material can now be rolled down 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 removed and used to roll down the next piece of Dual Lock reclosable fastener in a similar manner.

    4. Curing

      The pressure-sensitive 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 achieve maximum bond strength is 72 hours

  • Comparable Materials for 3M SJ3550

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Shear Strength Test Methods
Shear Strength Type Test Time Test Temperature Test Humidity Test Method
43 (lbs(F)/sq inch) Dynamic shear strength 1" x 1" overlap), The listed reclosable fastener combinations were engaged with firm pressure and disengaged at the rate of 12 inches (305 mm) per minute., 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_x00D_ ) and Dual Lock reclosable fastener SJ3550 (Type 250) to Dual Lock reclosable fastener SJ3550 (Type 250) is 36 lbsF/sq inch (249 kNewtons/m2).
155 (grams/cm2) Static shear strength 600,000 sec 38°C 100 % (1" x 1" overlap), Holds minimum 2.2 #/in2 for indicated time and temperature
155 (grams/cm2) Static shear strength 600,000 sec 93°C (1" x 1" overlap), Holds minimum 2.2 #/in2 for indicated time and temperature
155 (grams/cm2) Static shear strength 600,000 sec 104°C (1" x 1" overlap), Holds minimum 2.2 #/in2 for indicated time and temperature
155 (grams/cm2) Static shear strength 2,820 sec 121°C (1" x 1" overlap), Holds minimum 2.2 #/in2 for indicated time and temperature
Tensile Strength Test Methods
Tensile Strength Type Test Time Test Temperature Test Humidity Test Method
155 (grams/cm2) Static Tensile Strength 10,000 min 38°C 100 % Holds minimum 2.2 #/in2 (155 grams/cm2) for indicated time and temperature
155 (grams/cm2) Static Tensile Strength 10,000 min 93°C Holds minimum 2.2 #/in2 (155 grams/cm2) for indicated time and temperature
155 (grams/cm2) Static Tensile Strength 10,000 min 104°C Holds minimum 2.2 #/in2 (155 grams/cm2) for indicated time and temperature
155 (grams/cm2) Static Tensile Strength 10,000 min 121°C Holds minimum 2.2 #/in2 (155 grams/cm2) for indicated time and temperature
40 psi Dynamic Tensile Strength Engagement, 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).
57 psi Dynamic Tensile Strength Disengagement, The listed reclosable fastener combinations were engaged with firm pressure and disengaged at the rate of 12 inches (305 mm) per minute., 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., 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)
Peel Strength Test Methods
Peel Strength Type Substrate Test Method
4.6 (Pounds/inch) 90° Peel Strenth Flexible to Rigid Width
1.5 (Pounds/inch) T-Peel Strength Flexible to Flexible Width
Cleavage Strength Test Methods
Cleavage Strength Substrate Test Method
32 (pounds/inch) Rigid to Rigid Substrates Width