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Amotherm Steel WB

Single-component water-based varnish for fire-protection of steel elements

CE marked, white, reactive (intumescent) water-based varnish for the fire-protection of steel elements and structures. Rated according to the European standard EN 13501 -2 and qualified according to EN 13381-4 and EN 13381-8, recommended for use in indoor environments according to ETAG 018-2. Rated according to European Technical Assessment ETA 14/0417.
Water based
Product information

Technical features

  • Once in place it looks like a normal varnish
  • It does not alter the aesthetics of the element
  • Easy to use
  • It does not add weight to the geometry of the structural element to which it is applied
  • A very slight initial odour, odourless once dry
  • Can be applied as a single thick coat (airless)


Specifically designed for fire-protection of structural building elements in steel for civil or industrial use. Recommended for indoor use, following application of an anti-corrosion or bonding primer for galvanised structures. Ideal for use in closed environments or where solvent-based products cannot be used.

Drying time

  • 6 - 12 hours at surface
  • 24 – 48 hours at depth

Depends on the structural element to be protected and the technical performance required.

Recommended treatments
1 x Amotherm Steel Primer Epoxy SB on galvanised structures / 1x Amotherm Steel Primer WB on black iron
Amotherm Steel WB in multiple coats to reach the prescribed quantity
1 x Amotherm Steel Top WB (optional for coloured finishes)

5 – 20 Kg

- Rated according to EN 13501 – 2
- Tested according to EN 13381 – 4 and 13381 - 8
- European Technical Assessment 14/0417
- Bears the CE mark
  Technical data sheet
functional specification modules

Supply and application of Amotherm Steel WB water-based intumescent paint, with a VOC of less than 8 g/l, for the indoor protection from fire of new or existing, galvanized or non-galvanized, steel structures.
The fire proofing treatment must be carried out by spraying, brushing, using a roller or with an airless pump, applied at any height, either vertically or horizontally and/or at any angle.
Before applying the intumescent coating, the surface must be carefully cleaned to remove all traces of oil or grease.
The preparation varies according to the type of surface to be treated. More specifically:
• new or existing, non-galvanized steel structures must first be sandblasted to grade SA 2½ (down almost to bare metal) and protected with a coat of Amotherm Steel Primer SB anti-corrosive primer.
• galvanized steel structures should be treated beforehand with a coat of Amotherm Steel Primer WB in order to aid the adhesion of the intumescent paint.

The quantity of intumescent paint to be applied to the various steel surfaces to be protected will depend on:
• the fire-resistance class required (R)
• the section factor of the individual profiles making up the structural framework to be protected
• the actual load conditions that determine the critical temperature
• the type of exposure to fire of each of the structural elements (pillar, beam, etc.).
For indoor applications, where there is damp and heavy condensation, or in areas where there is weak chemical activity as a result of specific industrial processes, we recommend the application of Amotherm Steel Top WB acrylic topcoat or Amotherm Steel Top SB solvent-based topcoat
Assessing the protective measures to be taken and determining the thickness to be applied must be carried out based on the contents of the evaluation reports prepared in accordance with the methods laid down in standard EN 13381-4 or EN 13381-8.

Intumescent paint certified by European technical approval ETA as required by EAD regulation 350402 - 00 - 1106.

Intumescent paint with environmental certification EPD according to ISO EN 14025 and EN UNI 15804 (environmental label type III) as required by Article 34 of the new Public Contracts Code defined by Legislative Decree No. 50 of 18-04-2016 and updated by Legislative Decree No. 56 dated 19-04-2017.

Guideline costs of materials and application by airless spray (excluding scaffolding and any preparation of the surface):
• Amotherm Steel Primer WB: € 4,80/m2 (100 g/m2)
• Amotherm Steel Primer SB: € 5,20/m2 (150 g/m2)
• Amotherm Steel WB intumescent paint: €15,50/m2 (for 500 micron DFT -
- 0,9 kg/m2)
Download application specifications in PDF format

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