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Pyromas A - Intumescent Acrylic Sealant

Pyromas A – Intumescent Acrylic Sealant

Intumescent Acrylic Sealant

Pyromas A is an intumescent sealant combining water-based acrylic emulsion with fillers to provide high levels of fire resistance in a range of building applications.

The one-part sealant is solvent free and when subjected to fire, a chemical reaction forms a safe, inorganic meringue, which provides proven fire sealing in building joints incorporating concrete, wood and metal.

  • Effective, slump-free sealing in joints up to 35mm wide
  • Proven 4-hour fire resistance
  • Can also provide 52dB acoustic rating
  • Permanent sealing for all low-movement joints, dry lining and partitions
  • Easily smoothed to a good surface finish
  • Available in white, brown and grey
  • Can be painted after curing
  • Supplied in 310ml cartridges to fit standard mastic guns or 600ml sausages



Pyromas A is a one part sealant system which is solvent free. When subjected to fire, a chemical reaction forms a safe, inorganic meringue. 

The intumesced product provides fire sealing in building joints up to 35mm wide.


Fire resistance tests have been conducted to BS476: Part 20: 1987 achieving 4 hours fire resistance in gaps up to 35mm wide. Tests were conducted between a number of substrates including Hardwood, Softwood, Steel, Concrete, Vermiculite Board and Aerated Concrete. Pyromas A shows good resistance to a wide range of commonly found chemicals. Care must be taken to avoid prolonged contact with hydrocarbon based products.


Pyromas A is suitable as a permanent fire seal in low movement joints, door frame to wall gaps, dry lining and partitions.


Joints in structures should be dry, clean, and free of powder or dust.

Pyromas A should be inserted to the correct depth to ensure the necessary fire performance.
To improve surface finish, smooth with a spatula. Cured Sealant can be over-painted.


Pyromas A is supplied in 310ml cartridges to fit standard skeleton mastic guns. Also supplied as 600ml sausages. Box quantities are 25 per box.

Physical Data

Colours: White, Brown & Grey

Storage Temp: +5° to +25°C

Reaction Temp: 120°C

Application Temp: +5° to +30°C

Volume Expansion: 150%

Tack Free Time: 10-60 minutes (depending on conditions)

Shelf life: 12 months

Joint movement: +/- 10%

Estimating Quantities for Pyromas A

To calculate the required number of cartridges required to fill a gap use the following equation:

W x D x L = N

N÷310= Number of Cartridges

W=Width of gap in mm.  D=Depth of gap in mm.  

L=Length of gap in mtrs.  N=Volume of material.


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