Thermoguard Fire Varnish Overcoat Interior
Intended use clear or stained varnish decorative fire protection for wood
Thermoguard Fire Varnish Overcoat must be used in conjunction with Thermoguard Fire Varnish Basecoat. Thermoguard Fire Varnish Overcoat comes in matt or satin finish and protects against UV and wear. Thermoguard Fire Varnish Basecoat is a varnish with the option of adding a clear or stained finish for protecting timber and timber derivative substrates from fire. The special formula provides a tough, durable finish to internal wood. Clear or stained finishes enhance the natural beauty of the wood while protecting new and previously varnished surfaces from fire.
Intumescent fire protection - Thermoguard Fire Varnish
When exposed to fire, Thermoguard Fire Varnish expands to create an insulating barrier, protecting timber surfaces from flames, heat and oxygen, and suppressing emission of deadly smoke and gases.
Thermoguard Fire Varnish Overcoat is available in clear or stained varnish, matt or satin.
Specification & application
Prepare and apply:
- 1 coat Thermoguard Fire Varnish Basecoat
Previously varnished and stained surfaces or wood preservers
Thermoguard Fire Varnish can be applied over firmly adhered standard clear varnish. For existing stained varnishes, stain coatings, old fire coatings or if in doubt, call us on 01753 684084.
- If preservatives are required, use rapid drying clear non-water repellent grades (allow adequate time for stain or preservative fluids to escape)
- For tanalised or other preservative treatments, call us on 01753 684084.
Phone: 01753 684084
Fire test standards
BS EN Class B s2 dO **
Class O *
Note. For 30 or 60 minutes fire resistance, call us on 01753 684084.
For doors refer to fire door varnish.
** See New Fire Regulations & Tests Explained (section pasted below)
* Class 0 includes Class 1.
Thermoguard will issue a Certificate of Supply upon request for each correctly specified project for insurance, fire and building control authority and client records against proof of purchase.
Cover, countersink and 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 silicone carbide abrasive when dry to provide a good key.
During application and drying of the full system
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 dew point avoid condensation.
New fire regulations & tests explained
The new fire standard BS EN test lasts 20 minutes with airflow and replaces the old BS 476 tests which lasted 10 minutes and strangely restricted airflow.
The new standard for flame spread and heat release Class B replaces Class O.
The new BS EN tests also monitor:
Smoke & Gas s s1 + s2 are none or very low & compliant levels, s3 moderate , s4 high smoke.
Flaming droplets or airborne particulates dO is none, d1 some, d2 + d3 moderate > high levels.
All products are manufactured and supplied under ISO 9000.
Environmental health & safety
Thermoguard Fire Varnish Basecoat, Clear and Stained Varnish Overcoats are water based.
Refer to Thermoguard Fire Varnish Overcoat HS Data Sheet.