Trade Name: Astro LST Mastic
Low Smoke & Toxicity Intumescent Mastic Sealant
Designed for use within enclosed areas such as tunnels and London Underground stations.
Tested for passenger carrying train systems to BS6853:1999 * and LUL approved
Low smoke and toxicity levels.
Fire resistance testing to EN 1366-3 EI 120, EN 1366-4 EI 240 and BS 476 300mins.
Tested BS 6853:1999 D8.3: Smoke Ao (max)
Fire Classification to EN 13501-2.
Acoustic Isolation to EN 10140 to 48dB.
Tested BS 6853:1999 B.1: Toxicity R value
Air Permeability testing to EN 1026 to 600Pa.
Mechanical Adhesion and Tensile testing to EN ISO 8039 & EN ISO 9046.
A one part intumescent acrylic sealant designed to resist the passage of fire, by forming a char that prevents the passage of fire and smoke, while maintaining excellent low smoke and toxicity levels.
Astro LST Mastic is halogen free and does not emit halogenated by-products under fire conditions.
High performance 5 hour fire rating. Joint movement capability of +/- 12% .
Highly flexible and water resistant it has good unprimed adhesion to a wide variety of common building substrates.
Tested in Block Wall, Concrete, Masonry and Plasterboard Partition. Tested in Concrete Floors.
Tested in Linear Joints up to 50mm wide. Tested in large service openings up to 490 x 150mm.
Tested with Metallic Pipes, Cables, Cable Bunches and Cable Trays.
Causes no known effects to plastic pipes, plastic cables, sheathing or metallic components.
In normal use it maintains the sound reduction index of a structure.
This sealant contains no raw materials known to have an estrogenic effect in the environment.
Astro LST Mastic is not affected by an outdoor environment. However, for long term storage and ease of installation, it is recommended that it should be stored indoors ideally in dry frost free conditions above 0°C and below +30°C.
The Astro LST Mastic Comes Only in White.
To Order & Specify
Please contact us and quote the following information - Quantity / Product Code / Product Description / sizes
Health and Safety
The product does not present any known health hazards during or after installation. Normal good industrial and personal hygiene practices should be observed. For further information on health and safety requirements please contact the technical team on: tel 01329 844 500 or email email@example.com
As part of our policy of ongoing improvements, we reserve the right to modify, alter or change product specifications without giving notice. Product illustrations are representations only. All information contained in this document is provided for guidance only, and as ASTROFLAME FIRESEALS LTD has no control over the installation methods of the products, or of the prevailing site conditions, no warranties expressed or implied are intended to be given as to the actual performance of the products mentioned or referred to, and no liability whatsoever will be accepted for any loss, damage or injury arising from the use of the information given of products mentioned or referred to herein.
The above information
to the best of our knowledge is true and accurate and based upon current
test data and is supplied for your guidance only. Customers should