AcousticNest ‘Pyromas A’ Intumescent Acrylic Sealant: Acoustic and fire sealant offering noise reduction of up to 52dB and 4-hour fire resistance ( 310ml cartridges )

Pyromas A is an intumescent sealant that combines water-based acrylic emulsion with fillers to deliver high levels of fire resistance across various building applications. This one-part, solvent-free sealant undergoes a chemical reaction when exposed to fire, forming a safe, inorganic meringue that provides reliable fire sealing for joints in concrete, wood, and metal. Pyromas A effectively seals building joints up to 35mm wide.

Performance:
Fire resistance tests, conducted in accordance with BS476: Part 20: 1987, demonstrated 4 hours of fire resistance in gaps up to 35mm wide. These tests were carried out on various substrates, including hardwood, softwood, steel, concrete, vermiculite board, and aerated concrete. Pyromas A exhibits strong resistance to a wide range of common chemicals, although care should be taken to prevent prolonged contact with hydrocarbon-based products.

Applications Method:
• Pyromas A is ideal for use as a permanent fire seal in low-movement joints, gaps between door frames and walls, dry lining, and partitions.
• Joints must be dry, clean, and free of dust or powder before application.
• For optimal fire performance, Pyromas A should be applied to the correct depth. To achieve a smooth surface finish, the sealant can be smoothed with a spatula.
• Once cured, the sealant can be over-painted.

Method of 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.