Product Description
Thermoguard Fire Varnish Basecoat is a clear intumescent varnish that is the first coat of a 2 coat system (3 coat externally). Decorative fire protection of timber and timber derived substrates to Class 1, Class 0, EN Class B s2 d0. The special formula provides tough, durable protection to internal and external wood.
The intumescent nature of this fire varnish basecoat means it expands when exposed to fire. This creates a barrier insulating and protecting the surface from flames, heat and oxygen and supressing the emission of smoke and gases.
- Comes in a clear or stained varnish finishes enhance the natural beauty of the wood
- Fire Varnish Overcoat matt or satin provides protection against UV and wear
Thinking of using over previously varnished and stained surfaces or wood preservers? Thermoguard Fire Varnish Basecoat can be applied over firmly adhered standard clear varnish. Please contact us if you’re thinking of applying over existing stained varnishes, stain coatings or old fire coatings.
Please Note: If certification is required, an intumescent enquiry form must be completed prior to purchase of the product. This will ensure the correct quantity is applied to achieve the fire rating. The enquiry form is available to download from the ‘Data Sheets’ tab.
Application 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 condensation
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.
Thermoguard Fire Varnish Basecoat should only be applied to dry wood, with dry conditions during application
Cleaning
Return as much unused material to its original container as possible. Wash brushes
rollers and guns with clean waters immediately following use.
Drying Times
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
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