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non-combustibility and fire-resistance

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Grenaseal

Non-sticky, heat resistant sealing for high temperature application 

Grenaseal is a non-woven glass mat coated on both sides with a thin vermiculite layer. The combination of glass fiber and vermiculite has resulted in a unique material that not only ensures the required tightness, but also maintains its properties even at high temperatures. The surface of the sealing remains non-sticky, making future disassembly of joints and possible service or inspection much easier.

This non-combustible material will find application primarily as a separation sealing in various applications, e.g. for connecting a flue, but also as thermal insulation. Its properties will ensure both the required tightness and easy disassembly during service / inspection.

Grenaseal will be used by anyone who cares about convenient servicing of a given technology, e.g. boilers. The non-sticky surface treatment made of vermiculite will not allow the material to "bake" to the flange or other contact point.

Grenaseal main advantages

Grenaseal main advantages

  • Savings: saves time for servicing - easy cleaning of flanges, convenient access for inspections and repairs
  • High thermal stability: designed for long-term operation at elevated temperatures up to 550 °C with the ability to withstand higher temperatures for short periods depending on product configuration
  • Excellent chemical resistance: resistant to the effects of commonly used oils, solvents and standard cleaning chemicals
  • Moisture and water resistance: maintains mechanical strength and shape even when exposed to moisture or wet conditions
  • Minimal emissions: suitable for clean production environments - a health-friendly solution without hazardous chemicals
  • Asbestos-free solution: ideal replacement for applications where asbestos was previously used
  • Very easy to process material: punching and shearing
  • Does not contribute to corrosion
  • Mechanical resistance: resistant to abrasion
  • Cost-effective solution


Formats produced

Formats produced

Grenaseal is produced in sheet format up to 600 x 1000 mm. Its easy further processing allows for virtually any shape cut for various specific fireproof sealing solutions.

  • Sheets up to 600 x 1000 mm
  • Easy shape cutting / cutting
For more information or an individual request, please contact us via the contact form or by e-mail obchod@grena.cz
  • Separation sealing for applications requiring high temperature resistance, e.g. for flues of stoves and boilers
  • Thermal insulation of pipes, ventilation, boilers and other high temperature applications
  • For easier servicing in the future (non-sticky surface of the sealing)
  • For convenient cleaning of flanges
Technical data

Dimensions (format) [mm]
up to 1000 x 600 mm
Dimension (thickness) [mm] 4 mm
Temperature resistance (long-term) [°C]
550 °C 
Temperature resistance (short-term) [°C] 650 °C  
More information will be added soon... 



Sheets of various sizes, max. up to 1000 x 600 mm.

Delivery based on individual order and telephone agreement with a sales representative.
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