Bostik ISR 70-03FR, the first fire-retardant SMP adhesive certified to European fire protection standard EN45545-2

The railway industry is constantly evolving to ensure the safety of its passengers. In this quest for safety, Bostik has made a major step forward by launching the Bostik ISR 70-03 FR, a flame retardant SMP adhesive, meeting or even exceeding the strict requirements of the European railway sector according to the EN45545-2 standard. In this technical article, we dive into the complexities of this innovative product, exploring its features, benefits and applications.

Bostik ISR 70-03 FR: Flame Retardant SMP Adhesive Approved EN45545-2


Developed specifically for the public transport industry, Simson ISR 70-03 FR is a robust and versatile SMP adhesive that meets the internal and external sealing requirements in all design and operation categories according to the EN45545-2 standard.


Key Features of Bostik ISR 70-03 FR


  • Color: Black
  • Base: MS Polymer
  • Hardness: 50 Shore A
  • Elongation at break: 200%
  • Temperature resistance: -40°C to +100°C
  • Skin formation time: 10 minutes


Benefits of Bostik ISR 70-03 FR


  • Flame Retardant: Bostik ISR 70-03 FR is the world’s first SMP adhesive compliant with the latest fire protection legislation, obtaining the highest fire safety rating according to the European standard EN45545-2 (HL3).
  • Halogen Free: This product is not halogenated, ensuring the absence of hazardous halogenated compounds.
  • Environmentally Friendly: Simson ISR 70-03 FR is free of solvents, isocyanates and PVC, making it an environmentally friendly choice.
  • UV and Aging Resistance: It maintains its performance even in harsh outdoor conditions.
  • Superior Adhesion: Bostik ISR 70-03 FR offers exceptional adhesion on various substrates, without the need for primer.
  • Wide Temperature Range: It retains permanent elasticity in temperatures ranging from -40°C to +100°C, ensuring reliability in extreme conditions.
  • Application: With a neutral, odorless and fast curing nature, this product is easy to handle.

This product is the perfect compromise between an adhesive and a sealant, making it suitable for elastic constructions in various industrial applications. In addition, it offers excellent UV, weather and temperature resistance, while being free of solvents, isocyanates and silicones.

Find out in this video, the advantages of Bostik ISR 70-03 FR:

Bostik ISR 70 03 FR - Fire retardant SMP adhesive EN4545-2 approved

A market page dedicated to the railway industry


We have developed on our website a page dedicated to the railway market. Find on this page, our bonding & sealing solutions, lubrication and electrical and electronic protection related to the railway market.

We offer through the brands Bostik®, Araldite®, Dowsil™, Molykote® and Krytox™ assembly and sealing solutions (assembly of sandwich panels, sealing of the structure, interior and exterior lighting) lubrication (interior lubrication, lubrication of bogies / brakes, lubrication of traction system,…) but also solutions for heat dissipation and protection of components of the embedded electronic system…

More info
Need more information on Bostik ISR 70 03 FR or on all products in the Bostik range? Contact our technical service at +33 426 680 680 or fill out the contact form.

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