ACTFLEX DENSIFIER Concrete densifier
Silane-treated colloidal silica concrete densifier and surface hardener
Near-neutral colloidal silica densifier, pH 8.0–10.0, that hardens concrete and cuts dusting.
ACTFLEX DENSIFIER coverage, coats and cure times
Silane-treated colloidal silica that reacts with free lime in porous concrete to form calcium silicate hydrate gel. It reduces dusting and efflorescence and can be polished to any specified gloss.
- Coverage
- 6–10 m²/Ldepends on concrete porosity · TDS p2
- Consumption
- 0.10–0.17 L/m²typicalapprox., at 6–10 m²/L · TDS p2
- 5 L pack
- 30–50 m²typicalat 6–10 m²/L · TDS p2
- 20 L pack
- 120–200 m²typicalat 6–10 m²/L · TDS p3
- Dwell time
- 10–15 minkeep the surface wet throughout · TDS p2
- pH
- 8.0–10.0near-neutral · TDS p2
- Heavy traffic
- Min 24 hcure before heavy traffic, at 25°C and 50% RH · TDS p2
- Full effect
- Several daystypicalfull densification development · TDS p2
- Service temp
- −10 to +65°Cservice temperature · TDS p2
From the FORSPEC data sheet, TDS-DENSIFIER · Revision 1 · 25 August 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise. Typical = FORSPEC’s own typical value, not a laboratory-certified one.
Where ACTFLEX DENSIFIER is used
Use it for
- Commercial floors: retail, malls and offices
- Industrial floors: factories and warehouses
- Residential driveways, walkways and patios
- Schools, hospitals and public buildings
- Parking garages, for abrasion resistance
- Transport terminals, sports courts and public spaces
Know before you start
- Not a waterproofing membrane or a stand-alone waterproofing solution
- Not for sealed, coated or highly polished surfaces: it must be able to penetrate
- Does not repair cracks: complete all crack repair before applying
- Not for severely deteriorated concrete, which may need structural reinforcement first
Its FORSPEC systems
How to apply ACTFLEX DENSIFIER
- 01
Prepare
Clean off dirt, dust, grease and oil. Mechanically remove coatings, sealers and curing compounds. Repair cracks and divots first with FORBUILD 100, FORCRETE 100 or the epoxy crack repair range. Vacuum.
- 02
Check
Make sure the concrete is porous enough to take it. Test a small area where the surface may be sealed or burnished.
- 03
Apply
Shake or stir. Apply evenly by low-pressure sprayer, microfibre mop or roller at about 6–10 m² per litre, working in manageable sections.
- 04
Dwell
Keep the surface wet for 10–15 minutes, topping up any area that dries out. Let it dry naturally. Do not rinse unless a specific procedure requires it.
- 05
Finish
Buff off excess with a microfibre pad where needed. Once dry, polish through the required grit levels if a gloss finish is specified.
- 06
Cure
Wait at least 24 hours before heavy traffic or further treatments. Test compatibility before any coating or sealer goes over it.
A short guide from the data sheet. Read the full ACTFLEX DENSIFIER TDS before you start.
ACTFLEX DENSIFIER questions
How much ACTFLEX DENSIFIER do I need?
About 6–10 m² per litre: a 5 L pack covers about 30–50 m² and a 20 L pack about 120–200 m². Porous concrete uses more. Establish actual use on a trial area first.
How long does it have to stay wet?
Keep the surface wet for 10–15 minutes. Reapply to any area that dries early, or it will not densify evenly.
Do I rinse it off?
No, not unless a specific procedure requires it. Let it dry naturally, then buff off excess with a microfibre pad if needed.
How soon can I use the floor?
Allow at least 24 hours before heavy traffic or further treatments. Full densification develops over several days.
Can I polish or coat over it?
Yes, you can polish it once dry to the gloss you specify. Test compatibility before any paint, epoxy or sealer goes over a treated surface.
Will it waterproof my slab?
No. It strengthens the surface and reduces permeability but does not replace a FORSPEC waterproofing system.
Used with ACTFLEX DENSIFIER
ACTFLEX DENSIFIER TDS and SDS
Always work from the current data sheet. Every FORSPEC TDS and SDS →
Specify it. Or buy it.
Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for ACTFLEX DENSIFIER.