Flexible sealants
Flame-retardant, high-strength sealant
Formulated for fire resistance, this high-strength, industrial elastic bonding adhesive has excellent weather resistance and vibration-damping properties.
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All marks used are trademarks and/or registered trademarks of Henkel and its affiliates in the US, Germany, and elsewhere.
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- Description
- Technical specification
TEROSON® MS 939 FR is an industrial elastomeric bonding adhesive specially formulated for fire resistance. As well as being flame-retardant to DIN 5510 S3 NF P 92507, M1 NF F 16-101 and NF P 92-512-M1, it has a high-strength assembly, great elasticity and vibration damping, and excellent UV- and weathering resistance.
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High strength
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Flame-retardant
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Weather and UV-resistant
- Product category:
- Flexible sealants
Technologies:
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Silane modified polymers, others
- Agency approvals / certificates / specifications:
- DIN 53504; DIN EN ISO 868
- Color:
- Black; Gray
- Cure rate:
- 3.0 h
- Elongation, at break:
- 180.0 %
- FEA (finite element analysis):
- Finite strain
- Full cure time:
- 24.0 h
- Key characteristics:
- Thixotropic
- Physical form:
- Paste
- Tensile strength, ISO 37:
- 3.5 MPa
How to use
The substrates must be clean, dry and free from any oil, grease or mould-release agents used in the manufacturing process. Depending on the surface, it may be necessary to roughen the surface or to use a primer/adhesion promoter to optimise adhesion. Due to the different compositions of paints, especially powder paints and the large number of different substrates, application trials before use are necessary. For cleaning, TEROSON® VR 10 or TEROSON® SB 450 from the Henkel portfolio are suitable. TEROSON SB 450 is especially recommended when bonding plastics and powder-coated parts. Care should be taken when bonding plastics sensitive to stress-cracking such as PMMA (e.g. Plexiglas®) and PC (e.g. Makrolon® or Lexan®). Application trials before use are necessary. There is no adhesion to polyethylene, polypropylene and PTFE. Substrates not mentioned above should be subject to trials.
Application from cartridges is made with the TEROSON Hand or Air Pressure Pistols and from foil cartridges with the corresponding FK-Hand or FK-Air Pressure Pistols. In the case of compressed air application, a pressure of 2 to 5 bar is required. Low material temperatures of the sealant will lead to an increase of viscosity, resulting in a lower extrusion rate. This can be avoided by bringing the sealant up to room temperature prior to application. TEROSON® MS 939FR can also be applied from hobbocks or drums with high-pressure pumps with follower plates. See separate application directions for TEROSON MS products in hobbocks and drums
For cleaning of application equipment contaminated with uncured TEROSON® MS 939FR, we recommend the use of cleaners + diluents TEROSON® VR 30 or TEROSON VR
Depending on the surface it may be necessary to roughen the surface or to use a primer/adhesion promoter e.g. TEROSON® SB 450 to provide optimum adhesion.
FAQ
TEROSON® MS 939 FR has a shelf life of 12 months in unopened original packaging. Henkel does not advocate using TEROSON MS 939 FR beyond the recommended shelf life and is unable to recertify material that has expired.
Yes. For optimum adhesion, all bonding surfaces should be clean, dry and free from contaminants such as oil, rust and grease. TEROSON® SB 450 can be used as a cleaner and adhesion promoter for difficult-to-bond materials.
TEROSON® MS 939 FR is not frost-sensitive and should be stored at a recommended temperature of 10 to 25°C.
The tensile strength of this product is approximately 3.5 MPa, measured under ISO 37.
Flame-retardant materials are classified as non-flammable or low-flammable materials which can help limit the effects and spread of fire in construction and transport applications. Refer to the TDS for specific certifications and ratings.
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