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JS780 S

JS780 S is a one-component polyisobutylene-based primary sealant for insulated glass units.

  • Flexibility over a large operating temperature range (including low temperatures)
  • High ultraviolet resistance
  • Very good adhesion on glass and composite films
  • No fogging
  • Extremely low moisture and gas permeability
  • Very easy to use

*Please contact us for estimates on delivery times for this products as lead times differ per country.


  • JS780 S can be applied with extrusion machines that are commonly used in the insulating glass industry at a temperature of +110°C to +130°C depending on the desired pressure and extrusion speed.
  • Wearing gloves is recommended while handling frames to prevent any fatty materials from being deposited on the surfaces, since this could weaken adherence and even create fogging.
  • Apply a regular and continuous strip following a minimum pre-established thickness.
  • Compression must ensure regular and sufficient deformation of the JS780 S strip.
  • Pay particular attention to the continuity of JS780 S strip in the corners.

For full application details, please refer to our Technical Data Sheet.

Technical data

Density*1.07 g/cm³
MVTR< 0.5 g/( m² ∙ 24h ∙ 2mm)
Gas Permeability< 0.001 g/( m² ∙ 24h ∙ 2mm)
Extrusion Temperature+110°C to +130°C

* Typical values

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