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A single pack solvent-based intumescent coating for fire protection of both internal and external structural steelwork. It can provide up to 120 minutes fire protection and gives a durable and attractive surface, similar to a paint finish. It provides an ideal base for decorative top seals and in a fire it expands to many times its original film thickness.

General information
Uniclass 2015
Ss_40_90_40_42 Intumescent coating systemsPrimary

M61/110 On site coating to primed steel

M61/115 On site coating to galvanized steel

M61/120 On site coating to existing steel

M61/140 On site overcoating to existing steel

M61/160 Off site coating to primed steel

M61/170 Off site coating to galvanized steel

Specification data - Intumescent coating systems
Product Reference

Nullifire S605

Fire resistance to BS 476-21

30 minutes

60 minutes

90 minutes

120 minutes


Not required

Carbomatic 15LT

Aluminium epoxy.


General purpose, single pack zinc phosphate.


Water-based acrylic.

Topseal -

Not required

Carboxane 2000

Modified silane multi-polymer.

Nullifire TS-815

Solvent-based acrylic.

Nullifire TS-818

Water-based polyurethane.


Not applicable

BS 4800

Insert requirements.


Insert requirements.

Standard product features


Pale green.

Technical properties:

  • Drying time (>10ºC): 24 hours.
  • Flash point: 30°C.
  • Solids content: 68% (± 2%).
  • Specific gravity: 1.37 (± 0.02).

Product Options


Applied to inhibit corrosion and to provide a suitable key for the basecoat. The choice of primer is dependent on the application and the substrate properties. Consult manufacturer's literature for more information.


Nullifire S605 basecoat can be left without topseal for 12 months, however for long term durability and external use, topseal is required. The topseal's available contain no fibres and are therefore suitable for areas where delicate electronic instruments are manufactured or used. The satin finish is easy to maintain by simply wiping clean with a damp cloth and any colour to a RAL or BS 4800 is available.

Similar products from Nullifire – a brand of CPG UK Ltd