Intumescent Paint

Intumescent Paint

McNaught Group are accredited applicators for PROMAT, CAP COATINGS, FIRE-TEX, NULLIFIRE, EXFIRE, FIRESHIELD.

McNaught Group are one of very few approved applicators of Fire Protective and Fire Retardant Coatings to various intumescent paint suppliers. Not only do we apply these systems, we certify them as well.

We have completed and certified jobs all over the state whether it be cable coatings for mines, up to 120 minute ratings for steelwork, installing fire board, vermiculite or coating plasterboard ceiling, walls and doors.

Intumescent paints are specially formulated coatings which expand to insulate the surface that has been painted to protect it in the event of a fire. Intumescent paints can be applied to many building elements providing fire rating times from 30 minutes to 120 minutes. Promat also supply an intumescent board that we install that can be rated up to 4 HOURS.

McNaught Group are an accredited applicators for PROMAT, CAP COATINGS, FIRE-TEX, EXFIRE, NULLIFIRE, FIRESHIELD. All these companies specialise in fire retardant coatings for all types of substrates such as steelwork, plasterboard, timber, cabling, doors, pressed metal and more...

Often called fire retardants, or mistakenly called fire proof paints, Intumescent paints refer to that class of specially designed paints which swell and form a protective "char" as a result of extreme heat exposure - such as a fire - increasing in volume. This char is a poor conductor of heat, and whilst not fire proofing the steel it is applied to, it protects the surface for an increased time from the destruction fire may otherwise cause.

Typically intumescent paints are applied to structural steel, for the purposes of ensuring that in the case of a fire, the steel does not warp as quickly as it may otherwise, thus allowing fire crews to extinguish the flames.


Rated to protect most structural steel for periods up to 2 hours (120 minute FRR)
Some weather resistance for up to 6 months without topcoat.
User friendly
Cost effective fire protection as compared to boards or linings
May be applied to a wide variety of surfaces


The 3 intumescent components

For an intumescent to function properly, it relies on the interaction of three specific components which it is made up of.

  • Carbon Supplier: Polyols as starch or pentaerythritol
  • Acid Source: Ammonium polyphosphate
  • Expanding Agent: Melamine

The 4 stage intumescent process

Intumescent paints are supplied and applied in one of two forms - solvent or waterborne polymeric binders.

  • The heat from the fire begins to soften the polymeric binder inside the fire retardant paint.
  • The heat also causes a release of an organic acid (from the Ammonia Polyphosphate)
  • Carbonisation of the polyols begins to take place
  • Gas produced through the decomposition of the blowing agent (melamine), swelling the molten mixture.
The final stage is solidification of the foamed char, through a cross-linking reaction, to maintain the insulation.

We service all of NSW


  • Approved by Standards New Zealand - Ref: MP 9 - Fire Properties of Building Materials and Elements of Structure
  • Approved by Certifier Pty Ltd for use in Australia Certificate RPL 2 – April 2005
  • British Certifier approved for protection of steel up to 2 hours FRR
  • Compliant to Australian Standard AS1530.4-1994
  • Research Centre for fire protection of steel requiring certification to BS 476 Part 21:1987 and equivalent standards for periods of 2 hours.
  • Meets the specific requirements contained in relevant sections of the NZ Building Code
  • Must be sealed with compatible topcoat for long term service

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