UK's Leading Provider Of Passive Fire Protection Products

Call 0333 043 0018
for Sales or Technical Enquiries

or you can email our sales support team on

Free Technical Support For Passive Fire Products

Free Technical Support

Fast free technical advice for products and projects.

Astroflame Fire Resistant Batt

Published: 05/06/2017

Constructed from a mineral fibre core coated on both sides with Astroflame mastic, theAstroflame fire batt is specially designed to seal service penetrations in walls and floors. When the mastic coating is subjected to high temperatures it transforms into a hard ceramic that prevents the passage of fire, smoke and heat for up to 4 hours. Suitable for indoor use without additional protection, with a lifespan of over 25 years, and also providing acoustic and thermal insulation, the Astroflame batt has been tested and proven in a variety of construction materials including concrete, masonry, and plasterboard partitions.


240 minute fire rating

Tested to BS 476 Part 20 & EN 1366 Part 3

Certifire approved

Thermal and acoustic insulation

Available in two versions:

600x1200x50mm 140Kgm²

600x1200x60mm 160Kgm²

Halogen and asbestos free - no toxic gases emitted when exposed to flame

Reduced smoke properties

Unaffected by fungus, moisture, oil, or vermin

Remains flexible between -5°C to +70°C

Not suitable for installations subject to regular structural movements

CE Marked

UL certified

Please note: Dust masks, eye protection and gloves should be worn when cutting. Cut edges should be sealed using Astroflame Coating to maintain integrity. Seal batt in place with Astroflame Intumescent Acoustic Mastic.


This is the technical data for the Astroflame Fire Resistant Batt.


Dimensions (LxWxD) 50mm: 1200 x 600 x 50mm

60mm: 1200 x 600 x 60mm

Density 50mm: 140kg/m³

60mm: 160kg/m³

Protection Level 4 hours

Thermal Conductivity 0.034 W/mK at 10°C

Air Permeability BS EN 1026: 600Pa - 100Pa 1.8/1.4 m³/h/m²

Water Vapour Permeability 3.08g/m²/24 hours

Acoustic Insulation BS EN 10140: 48dB

Maximum Size of Seal Wall: 5.76m²

Floor: 2.88m²

Lifespan over 25 years

Heat Ageing 336 hours: no defects at 40°C


Passive Fire Products have a range of Fire Resistant Batt's all available on next day delivery. Take a look here or call our team to discuss your required specification.

Astroflame Fire Resistant Batt
FAQs | Privacy Policy | Returns Policy | Terms & Conditions
© 2020 Passive Fire Products LTD. All Rights Reserved.
Card Payments Powered By Stripe
Sea Dragon Web Design