BOSTIK STR220A

Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.

BOSTIK STR220A

Main features

  • Elastic SMP Joint Bonding
  • 30-Minute Skin Formation
  • Excellent UV and Weather Resistance

Product Description

Bostik STR220A is a one-component silyl modified polymer (SMP) adhesive/sealant for elastic bonding and joint sealing in transportation assemblies. It moisture cures; at 20 deg C and 50% RH, skin formation is about 30 minutes and cure development is about 2 mm after 24 hours. After cure, the material measures Shore A 44, reaches 220% elongation at break, and has a -40 to 121 deg C temperature-resistance range. STR220A adheres to metals, glass, PVC, polyester, and coated wood with defined surface-preparation requirements. Applications include buses, RVs, trailers, and related transportation joints and seams.

Key features

  • Elastic SMP Joints: One-component SMP material is used for bonding and sealing elastic joints and seams.
  • 30-Minute Skin Formation: Skin forming time is about 30 minutes at 20 deg C and 50% RH.
  • UV and Weather Resistance: Cured UV and weather resistance is rated Excellent.

Applications

Bonding and sealing joints in buses, RVs, trailers, and related transportation assemblies.

Product Family

BOSTIK STR220A

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.6
Physical Properties
Skin Time
30 min.
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
220 %
Thermal Properties
Temperature Resistance
Temperature resistance is the maximum temperature that the material or product can withstand for a period of time. The temperatures listed should be considered as guidelines for an operating temperature of about 30 minutes. Typically, the material can withstand much longer times at temperatures about 20°C lower and can withstand much higher temperatures for short, intermittent times.
-40°C to 121 ˚C

Additional Information

Technical properties

As-supplied and application properties

PropertyValueUnitMethod / condition
Basic materialSilyl Modified Polymer (SMP)As supplied
Curing methodMoistureOne-component cure mechanism
Specific gravity1.6g/mlAs supplied
Skin forming time30min20 deg C and 50% RH
Curing speed after 24 hrs2mm20 deg C and 50% RH
Application temperature5 to 35deg CExtrusion/application range
Shelf life12monthsOriginal unopened container; dry place at 5 to 35 deg C
Technical properties

Final-state properties

PropertyValueUnitMethod / condition
Shore A hardness44ASTM 2240
Tensile stress at break270psiASTM 412
Elongation at break220%ASTM 412
Shear stress180psiASTM D1002; Al-Al; 1/16 in thickness; 2 in/min test speed
Temperature resistance-40 to 121deg CCured material temperature-resistance range
UV and weather resistanceExcellentCured material

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