Thermoguard Fire Protection

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Thermoguard Fire Varnish

Fire Varnish Basecoat a two-component product consisting of base + activator for use under Fire Varnish Overcoat Matt and Satin

Can be specified as part of of the Thermoguard Fire Varnish 30 & 60 Minute Systems.

All Thermoguard Fire Varnish Systems are made up of Thermoguard Fire Varnish Basecoat a  two component, waterbased product consisting of a base and activator mixed together  before use which is a clear, intumescent varnish to be finished with the appropriate Fire  Varnish System.

When exposed to fire, the Thermoguard Fire Varnish System expands to create an insulating  barrier, protecting timber surfaces from flames, heat and oxygen and suppressing emission  of deadly smoke & gasses.

Protects Timber and timberderivatives  to  BS Class 1 and Class 0 Surface Spread of Flame as well as BS EN Class B s2 d0

 

Thermoguard Fire Varnish Systems can be applied over new timber and firmly adhered standard clear varnish. For existing stained varnishes, stain coatings, old fire coatings or if in doubt, please contact our technical department.

• If preservatives are required, use rapid drying clear non water repellent grades*.

• For tanalised or other preservative treatments, contact our Technical Department.

• Allow adequate time for stain or preservative fluids to escape before applying Thermoguard  Fire Varnish Basecoat

Preparation

Cover, countersink & fill, or use non-ferrous, galvanized, stainless or sheradised fittings 

Ensure surfaces are dry, clean and free of all contamination.

Varnished, sealed or non-porous wood should be abraded thoroughly with medium grade  silicon carbide abrasive when dry to provide a good key.

For application to OSB/Sterling Board please contact  Technical department

Thermoguard Fire Varnish Basecoat should only be applied to dry wood, with dry conditions  during application

 

Drying time 

Drying time of the basecoat in good conditions is overnight. Once the basecoat has dried in  good conditions the basecoat remains ideal to overcoat for a further 4 days. Thereafter, the  basecoat becomes gradually harder, until it reaches a point where the overcoat may not  obtain a good bond.

Thermoguard therefore recommend overcoating when basecoat is dry, within the following  4 days in good conditions.

Delamination of overcoat caused by application to near-full cured basecoat has NEVER  occurred when the overcoat was applied within 7 days. The longer the delay beyond '4 days  after basecoat has dried' (so typically 5 days after application), the greater the risk of  overcoat delaminating.

 

If overcoating is delayed notably beyond 7 days after the basecoat was dry, it is advised;  Basecoat is abraded to obtain a key with 120 grit abrasive

Apply a light coat of basecoat to replaced material removed during abrasion,  Apply overcoat within the ideal window or as near to it as possible

 

Conditions 

Ensure surfaces are thoroughly dry – max 18% moisture content.

Maximum relative humidity RH 75%.

Ensure adequate ventilation.

Minimum air temperature 6°C. Minimum surface temperature 3°C above dewpoint – avoid  c condensation