Thermoguard – Thermocoat S

Thermoguard Thermocoat S is an intumescent solvent-borne coating for the protection of exterior steels and steels exposed during construction.

When applied in accordance with the correct film thickness schedule can achieve 30, 60, 90 and 120 minute protection.


  • 30 & 60 Minute Resistance

  • Steel & Iron


  • 2.5kg

  • 10kg

  • 20kg


  • Primer

Fire Rating

  • Upto 120 minutes Resistance to Fire



Product Name: Thermocoat S Intumescent Paint for Structural Steel and Cast Iron

Key Benefits:
– Solvent-based intumescent coating compatible with various topcoats, including water-based or 2010 compliant finishes.
– Provides fire resistance for up to 90 minutes with a minimum number of coats.
– Suitable for dry internal, visible or occasional modest damp internal areas, wet or external under cover applications.
– Can be topcoated with Flame Retardant gloss, eggshell, WB satin, WB matt BS 4800 & RAL colours.

Intended Use:
– Optimized for protecting shaped steel and hollow bracing.
– Provides fire resistance to structural steel and cast iron.

How it Works:
– Heat from a fire triggers a catalytic reaction, causing the expansion of an insulating char layer up to 50 times the paint thickness.
– The char layer keeps the steel below its critical temperature, maintaining the structural integrity of the building.

Pack Sizes: Available in 20kg, 10kg, 2.5kg containers.

Coverage: Contractor should obtain basecoat application schedule from Thermoguard’s Technical Department or follow can guidance. Overspreading should be avoided to maintain compliance.

Drying Times:
– Brush/roller application Surface dry: minimum 2 hours, Handle minimum 24 hours. Recoat: minimum 6 hours. Overcoating with Flame Retardant finish: minimum 24 hours.
– Spray Application Surface Dry: minimum 4 hours, Handle minimum 24 hours. Recoat: minimum 12 hours. Overcoating with Flame Retardant finish: minimum 48 hours.

– Steel and cast iron should be free from rust and millscale, primed with Thermoguard Steel Fire Paint Primer to 75 microns DFT or alternative good quality anti-corrosive primer compatible with intumescent paints.
– Galvanized surfaces should be treated with “T” wash/Mordant solution & prime with zinc phosphate or other primer for steel.

Application Conditions:
– Maximum Relative Humidity: 80%
– Minimum ambient temperature: 4°C
– Minimum Steel Temperature: 3°C above Dew Point

– Can be applied by brush, roller, or airless spray. Spray application is recommended for the best finish in the shortest time.
– Contractor should obtain a basecoat application schedule from Thermoguard’s Technical Department.
– Maximum wet film thickness per brush coat – 600 microns. Maximum wet film thickness per spray coat – 1000 microns.

Spray Equipment:
– Airless Spray Pump recommended.
– Use equipment recommended by the manufacturer for the application of high viscosity intumescent paints.
– Filter size 30 mesh. 10mm hose 3/8” diameter with no whip end.
– Tip Size: 321, 323, 421, 423.

Fire Certification:
– Thermoguard issues a Certificate of Supply on request for each specified project for insurance, Fire and Building Control Authority and Client Records.

VOC Content:
– EU limit for this product (cat A/i) is 500 g/l. This product contains 398 g/l.

– Intumescent compounds and resin binders, with high opacity pigment.

Manufacturer Contact Information:
– THERMOGUARD UK Ltd, Kirkby Street, Hull, HU2 0HE.
– Tel: 01142 768008
– Email:
– Website: