Bostik 7003

Bostik 7003 by Bostik is an adhesive that combines the properties of an adhesive and a sealant. Simson ISR 70-03 is suitable for elastic joints requiring high strength. It is formulated based on Silyl Modifier Polymer (SMP). Applications include:

  • Elastic bonding and sealing joints, such as in buses, caravans, and trucks.
  • Bonding and sealing joints in sunshade systems.
  • Joints in roof systems of buses, trains, and trucks.
  • Bonding aluminum or polyester corner profiles.
  • Joints in flooring systems.
  • Sealing welded joints of metal frames on polyester components.

Bostik 7003 Simon ISR 70-03

Bostik 7003 is a heat-resistant and fire-resistant adhesive that maintains a permanently elastic bond in temperatures ranging from -40°C to +120°C. This high-quality product, developed with advanced technology, is specifically designed for industrial applications.


In general ISR 70-03 adheres well without primer on clean, dry, dust- and grease free substrates of aluminium, stainless steel, galvanised steel, zinc, copper, brass, powder coated metal, most lacquered metal surfaces, glass, PVC, polyester (GRP), painted and lacquered wood, etc.

No adhesion on untreated polyethylene, polypropylene and teflon. In those cases where, due to great thermal or physical loads and especially under wet conditions, high adhesion demands are needed, the use of Simson Prep M is recommended. Prep M degreases and prepares the surface of the substrate in one step. On plain, untreated wooden surfaces and other porous substrates Simson Prep P is recommended. For more details concerning Prep M and Prep P consult the specific Technical Data Sheets. For not mentioned substrates and additional information consult Bostik.


ISR 70-03 can easily be extruded with a hand- or air pressure gun at temperatures between +5°C and +35°C. In sealing applications ISR 70-03 should be tooled or smoothened within 10 minutes (at 20°C/50% R.H.) with a spatula or putty knife, occasionally moistened with a soap solution.

Avoid soap solution penetrating between joint sides and sealant, because this will create loss of adhesion. In bonding applications the substrates have to be assembled within 15 minutes (at 20°C/50% R.H.) after applying ISR 70-03. In general an adhesive thickness of 2 mm is recommended. At a temperature of +20°C and a relative humidity of 50% ISR 70-03 can be painted with the most industrial paints already 10 minutes after application. Best adhesion of paint coats is generally obtained if painted within 4 hours after applying ISR 70-03. Cleaning tools or removing uncured residue of ISR 70-03 can be done with a clean colourless cloth, wetted with Simson Liquid 1. It is recommended to make a trial first to check possible attack of the substrate by Liquid 1.



Bostik 7003 can be stored for 18 months in cartridges and 12 months in sausages, in an original, unopened container in a dry place at temperatures between +5°C and +30°C.


Basic material Silyl modified polymer (SMP)

Curing method


Specific gravity

ca. 1.5 g/ml

Skin forming time

ca. 10 min (20oC/50%/R.H.)

Open time

<15 min

Curing speed after 24 hrs

ca. 3mm

Shore A hardness

ca. 55 (DIN 53505)

Volume change

<3% (DIN 52451)

Tensile stress (100%)

ca. 2 (DIN 53504/ISO 37)

Tensile stress at break

ca. 3.2 (DIN 53504/ISO 37)

Elongation at break

ca. 250% (DIN 53504/ISO 37)

Shear stress

ca. 2.5 MPa

Tear propagation

ca. 16 N/mm

E-Modulus (10%)

ca. 3.8 Mpa (DIN 53504/ISO 37)

Solvent percentage


Isocyanate percentage


Glass transition (Tg)

-50 °C

Application temperature

+5 till +35 °C

UV- and weather resistance


Colours (standard)

White, grey, black,


290 ml cartridges, 400 ml and 600 ml sausages

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