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A thin film, moisture resistant intumescent basecoat for the fire protection of internal and semi-exposed structural steelwork. It can provide up to 60 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.


  • Environmentally friendly.
  • Low odour.
  • Low VOC content.
  • Safe to use in confined spaces.

General information

Environmentally friendly

Low odour

Low VOC content

Safe to use in confined spaces

Uniclass 2015
Ss_40_90_40_42 Intumescent coating systemsPrimary

M61/120 On site coating to existing steel

M61/140 On site overcoating to existing steel

M61/170 Off site coating to galvanized steel

M61/115 On site coating to galvanized steel

M61/110 On site coating to primed steel

M61/160 Off site coating to primed steel

Specification data - Intumescent coating systems
Product Reference

Nullifire S708-60

Fire resistance to BS 476-21

30 minutes

60 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



Technical properties:

  • Drying time (>10ºC): 24 hours.
  • Solids content: 70% (± 2%).
  • Specific gravity: 1.38 (± 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 S708-60 basecoat can be left without topseal for six 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.

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