Flametect CWD+ Clear Flame Retardant for Wood
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BS476 Class 0 & 1
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EN13501-1 B S1 D0
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UK Manufactured
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BS EN 927-6 Weather Tested
What is this product?
Flametect CWD+ works differently from surface coatings. Rather than sitting on top of the wood, its water-based formula penetrates deep into the timber grain, where it chemically converts the wood to carbon when exposed to flame or intense heat. This charring process slows ignition, reduces surface flame spread and suppresses smoke — giving people more time to evacuate and fire services more time to respond.
The result is certified fire protection with no visible evidence it is there. The wood looks, feels and behaves exactly as it would untreated — no sheen, no film, no discolouration. Developed and manufactured in the UK by Eco-Sol Ltd in partnership with a Queen's Award for Enterprise-winning chemical manufacturer, every batch is produced to ISO 9001 standards.
Key Benefits of Flametect CWD+
- Invisible protection — dries to a natural, clear finish with no discolouration or sheen
- Safe and sustainable — 100% water-based, VOC-free, non-toxic and non-irritant
- Durable outdoors — weather-resistant and non-leaching; the flame retardant is locked in with specialist couplers that resist moisture and UV, verified by BS EN 927-6 accelerated weathering testing
- Easy to apply — brush, roller, low-pressure spray or immersion; suitable for DIY and professional use
- Compatible with finishes — can be over-coated with Osmo clear or colour finishes once fully cured (contact us for guidance on specific products)
- Non-corrosive — safe for use around stainless, galvanised and treated metal fixings; fully breathable
Typical Applications
- External and internal timber cladding
- Decking and outdoor structures
- Log cabins, sheds and garden offices
- Barn and loft conversions
- Structural timber partitions and beams
- Reclaimed, decorative and feature timber
- Pergolas, gazebos and event structures
- Dried natural materials including hay and straw
- MDF — treated to Euroclass C s2 d0
What Flametect CWD+ Cannot Do
Flametect CWD+ is a reaction-to-fire treatment, not a structural fire resistance product. It is not suitable for:
- Previously painted, varnished, oiled or waxed surfaces
- Composite boards including those with veneers, plywood, cork or laminates
- Upgrading a standard door to a certified fire door
- Achieving 30 or 60 minute structural fire resistance (BS476 Parts 21/22)
Not sure if this product is right for your project? Contact our team for free technical advice, or call us on 02920 026582.
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Invisible protection — dries to a clear, natural finish with no discolouration or sheen
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Safe & sustainable — 100% water-based, VOC-free, non-toxic and non-irritant
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Durable outdoors — weather-resistant, non-leaching and designed for permanent exterior use
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Easy to apply — spray, roller, brush or immersion, suitable for DIY and commercial use
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Compatible with Osmo coatings — can be over-coated with clear or coloured Osmo finishes
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Free Statement of Performance certificate included with every order
Specifications & Documents
Full technical data and downloadable certification for compliance records.
| Product Code | Fcwd750 |
| Suitable For | Cladding, decking, log cabins, sheds, timber structures and partitions |
| Finish | Clear, natural appearance — no discolouration or sheen |
| Use | Interior & exterior |
| Application Method | Brush, roller, spray or immersion |
| Fire Classification | EN13501-1 Euroclass B s1 d0 |
| British Standard | BS476 Class 0 & 1 |
| VOC Content | 100% water-based, VOC-free, non-toxic |
| Shelf Life | Use within 90 days of purchase |
| Coverage | 4.0 m² per litre |
Flametect CWD+ Clear Flame Retardant for Wood — Product Overview
Which Do You Need?
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Flametect CWD+ Clear Flame Retardant for Wood
This product
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Flametect Nitro D
Alternative
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|---|---|---|
| Best for | Cladding, decking, log cabins, sheds, timber structures and partitions | Tents, marquees, yurts, tepees, event tents and outdoor textiles |
| Finish | Clear, natural appearance — no discolouration or sheen | Clear, flexible finish |
| Interior / exterior | Interior & exterior | Interior & exterior, including damp and wet environments |
| Water resistance | Weather-resistant, BS EN 927-6 accelerated weathering tested | Water & UV resistant binder — weather resistant, prevents leach out |
| Substrate | Absorbent wood & timber | Natural, natural/synthetic blends and most synthetic textiles |
| Fire classification | EN13501-1 Euroclass B s1 d0 | BS7837 & BS5438 |
| British standard | BS476 Class 0 & 1 | BS7837 & BS5438 |
| Application method | Brush, roller, spray or immersion | Spray, roller or immersion |
| Formula | 100% water-based, VOC-free, non-toxic | Water-based, non-toxic, non-hazardous, no solvents |
Not sure which applies to your project? Call us on 02920 026582 — our team can recommend the right product in minutes, free of charge.
How to Apply
Simple application with standard tools — no specialist equipment required.
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1Prepare the surfaceThe timber must be bare, clean and dry, with a moisture content below 20%. Remove all existing paint, varnish, oil, wax or sealant before treatment. Sand rough or uneven surfaces lightly if needed to improve penetration.
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2Apply the first coatApply generously along the grain using a brush, roller or low-pressure sprayer. Work the product into the surface and allow it to fully soak in. Do not spread too thin — the wood should visibly absorb the liquid. Allow 1–4 hours between coats.
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3Apply the second coatA second coat is required to achieve the full certified treatment rate of 250 ml/m². Apply in the same way as the first coat and allow the product to penetrate fully. Avoid applying in direct sunlight or strong wind.
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4Allow to cureAllow a minimum of 24 hours drying time at 20°C before light use, and 48 hours before exposure to rain or heavy use. The wood may appear slightly damp immediately after application — this is normal and will dry to a fully clear, natural finish.
Coverage Guide
Certifications for This Product
Every claim is backed by independent, UKAS-accredited test data.
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🛡️BS476 Class 0 & 1Meets the British Standard for surface spread of flame and fire propagation, the benchmark referenced in UK Building Regulations Approved Document B.
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🏅EN13501-1 B S1 D0Tested to the European fire classification standard. B s1 d0 indicates very limited fire contribution with minimal smoke and no flaming droplets. Now the primary standard for UK construction projects.
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🇬🇧UK ManufacturedDeveloped and manufactured in the UK by Eco-Sol Ltd in partnership with a Queen's Award for Enterprise-winning chemical manufacturer, in an ISO 9001 quality-assured environment.
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🌧️BS EN 927-6 Weather TestedIndependently tested to NT053 and NT054 accelerated weathering cycles, confirming the flame retardant does not leach out under prolonged rain, UV and temperature cycling. Suitable for permanent exterior use.
Frequently Asked Questions
Can't find what you're looking for? Call us on 02920 026582 or use live chat for free expert advice.
No — Flametect CWD+ is a clear, penetrating treatment that soaks into the wood rather than sitting on top as a film. Once dry, the natural colour and texture of the surface remain completely visible with no discolouration or sheen.
Yes. Once fully cured (48 hours), the treated surface can be painted, stained, oiled or varnished as normal, including with Osmo coatings. The treatment does not affect adhesion of most common finishes.
Yes — Flametect CWD+ is 100% water-based, VOC-free and non-toxic, making it safe to use indoors with normal ventilation. Once fully cured, treated surfaces are safe for everyday household contact.
Flametect CWD+ is not suitable for previously painted or varnished surfaces, plywood, cork or laminated boards, and cannot be used to upgrade standard doors to certified fire doors or achieve 30/60 minute fire resistance ratings.
Because the treatment penetrates the wood rather than sitting on the surface, it is long-lasting and not removed by normal cleaning. For exterior applications we recommend reapplication every 3–5 years.
Yes — a bespoke Statement of Performance certificate is included free with every order. Full test certificates and Safety Data Sheets are also available to download from the Documents section above.
Apply 250ml per m² for the full fire protection rating. Use our coverage calculator above to get a specific recommendation based on your area.
Yes — Flametect CWD+ is independently tested to BS EN 927-6 for accelerated weathering, making it suitable for permanent exterior use including cladding, decking and log cabins.
What Our Customers Say
Verified reviews collected via eKomi — independently moderated and genuine.
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★★★★★
Gave them a ring to ask for some advice, was pointed to exactly what I needed and how much. Arrived promptly and has performed perfectly.
Verified purchase · 2 weeks ago -
★★★★★
Very quick response to query and fast delivery. Easy to use product with good instructions. Great company. Will use again.
Verified purchase · 1 month ago -
★★★★★
Excellent product with swift delivery. Easy to top up fire retardancy after the deck was cleaned. Looks completely untreated which was exactly what we wanted.
Verified purchase · 1 month ago