Astroflame Passive Fire Protection Products



Intumescent Paint for structural steel and cast iron

Conforms to BS476 Part 21: - Fire resistance for load bearing elements of structural steel

Rated for 30 or 60 minutes.

Available in wide range of finishes.

Brush, roller or airless spray application

Technical support is important when selecting fire retardant coatings - please contact us.

.protective fire varnish


ASTRO ISS Paint is an intumescent coating for steel, a thin decorative fireproof paint system providing fire resistance to structural steel and cast iron.

Heat from a fire triggers a catalytic reaction causing intumescence (expansion) of an insulating char layer up to 50 times the paint film thickness. This char keeps the steel below critical temperature to maintain the structural stability of the building.

Fire resistance of ½ hour and 1hour can be achieved with a single application of ASTRO ISS Paint.


A range of hard, high quality, weather resistant decorative finishes matches the decor, architectural or historic features of a building while helping to make it a safer structure.

Colour ChartsAvailable in BS4800, RAL and metallic colours
and a non decorative finish for unexposed areas.
Eggshell............... BS4800 + RAL.
One-coat gloss..... BS4800 + RAL.
Metallic................ Steel, gunmetal, rust, silver, gold.

Non decorative..... N/A - For dry, hidden areas only.

ASTRO ISS Paint is available in 5 kilo and 20 kilo containers
ASTRO FR PAINT (flame retardant topcoat finish) is available in 2.5 and 5 Litre  containers.

To Order & Specify

Prior to application the contractor should contact the Astroflame Technical Department to obtain a basecoat application schedule. We are happy to provided specifications and quotations

Please use our structural steel specification form to ensure we cover all apects of your fire protection and decorative requirements in our quote.

Further (independent) information, both general and technical on fire protecting stuctural steel, can be found at the Association for Specialist Fire Protection (ASFP) website ASPF FAQ's - Structural Steel Fire Protection.

Fire Tests

Certificate of Supply issued upon request for each project for
Insurance, Fire and Building Control Authority and Client Records.




Steel and cast iron should be free from rust and millscale and primed with ASTRO HBP high build primer 75 microns DFT or other primer compatible with intumescent paints. Galvanized steel or Stainless Steel should be degreased and then primed with a suitable primer.

We recommend the use of airless spray equipment for large areas
Graco 5000 or 7500
Filter size 30 mesh
10mm hose with no whip end
Tip size : 317-319 (6" fan) - Narrow surfaces 417-419 (8" fan) - Broad surfaces
Cleaner: solvent or water depending on paint type.

Max. Relative Humidity 80%.
Min. Temperature 6°C.
Min. Surface Temperature 3°C above dew point
Max Thickness per coat; brush 600 microns
Max Thickness per coat; spray 2000 microns (S)
Max Thickness per coat; spray 1400 microns (W)

The paint can also be applied by brush or roller.

Minimum drying times:

Brush / Roller


Surface Dry






Overcoat with ASTRO FR decorative finish




Health and Safety

Observe all normal health and safety precautions for painting including ventilation, hygiene and masks and protective clothing as appropriate.




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