Sikafloor® CureHard-24
Sodium silicate / water based based transparent surface hardener, dust proofer, densifier and impregnating sealer for concrete
Sikafloor® CureHard-24 is a one part, clear sodium silicate based liquid to harden and provide an impregnating seal fresh or hardened concrete.
- Ready to use
- Easy to apply
- Improved chemical and abrasion resistance compared to untreated concrete
- Reduced dusting of concrete floors
- Very low VOC
- Non-yellowing
- Good penetration - designed to pentrate, not provide a surface seal
- Solvent free
- Colourless and odourless
Usage
- Horizontal old or new concrete surfaces, where a hard surface with light to moderate abrasion resistance is required e.g. warehouses, industrial plants, stores, shopping malls, parking structures, service stations, hangars etc.
- as an impreganting sealer on concrete slabs where no specific curing efficiency or standards are required
- Suitable for interior or exterior applications as an impregating sealer.
- As a desifier in the process of grinding and polishing concrete.
- Dust-proofing of prefabricated concrete elements.
- Suitable for protection against ingress (Principle 1, method 1.2 of EN 1504-9)
- Suitable for physical resistance (Principle 5, method 5.2 of EN 1504-9)
Advantages
- Ready to use
- Easy to apply
- Improved chemical and abrasion resistance compared to untreated concrete
- Reduced dusting of concrete floors
- Very low VOC
- Non-yellowing
- Good penetration - designed to pentrate, not provide a surface seal
- Solvent free
- Colourless and odourless
Packaging
5L,20 L poly cube - 200 L drum
Colour
Clear liquid
Product Details
APPROVALS / CERTIFICATES
Impregnation for surface protection of concrete according to EN 1504-2:2004, ingress protection and physical resistance, Declaration of Performance 02 08 03 04 004 0 000001 1180, certified by notified factory production control certification body 1020, certificate of conformity of the factory production control 020025682, and provided with the CE marking.
Composition
Sodium silicate water dilution
Shelf life
24 months from date of production
Storage conditions
The product must be stored properly in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between +5 °C and +30 °C. Protect from frost.
Density
~1.2 kg/l (at +20 °C)
Solid content by mass
~24 %
System structure
General sealer: 1–2 coats
Hardener / Sealer: 1–2 coats
Abrasion resistance
50 mg or 81.5 % increase in abrasion resistance compared to untreated sample (C(0,70) concrete according to EN 1766) (Taber Abraser, H-22 Wheel, 1000 g / 1000 cycles) | (EN 5740-1) |
Resistance to impact
| 60 Nm (class III: ≥ 20 Nm) | (EN 6272-1) |
Sample (MC(0,40) concrete according to EN 1766
Tensile adhesion strength
| 4.8 N/mm2 | (EN 1542) |
Sample (MC(0,70) concrete according to EN 1766
Penetration depth
| 5.5 mm | (EN 1504-2) |
Sample (MC(0,70) concrete according to EN 1766
Water absorption
| w = 0.03 kg/m2×h0.5 | (EN 1062-3) |
(on a substrate w > 1 kg/m2 h0.5)
Application
Ambient air temperature
+5 °C min. / +35 °C max.
Relative air humidity
100 % max.
Substrate temperature
+5 °C min. / +35°C max.
Substrate moisture content
Can be applied on a surface dry substrate.
Waiting time to overcoating
Where 2 coats are required, to ensure maximum densification, the second coat can be installed 2–4 hours following the first.
Allow previous coats to become tack free before applying additional coats.
| Temperature | Time |
| +5 °C | ~ 3.5 hours |
| +10 °C | ~ 3 hours |
| +20 °C | ~ 2 hours |
| +25 °C | ~ 1.5 hours |
Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity
Drying time
The surface is touch-dry after 2 hours at +20 °C.
Maximum sealing and hardening effect achieved after ~7 days at +20 °C.
Applied product ready for use
| Substrate temperature | Fully serviceable |
| +10°C | ~ 6 hours |
| +20°C | ~ 5 hours |
| +30°C | ~ 4 hours |
Note: Times are approximate and will be affected by changing ambient and substrate conditions.
Consumption
Approx 0.15–0.25 l/m2/coat (4–7 m2/l/coat). as a densifier Approx 8-10m2 as a general sealer/imprenator
This figure is theoretical and does not include for any additional material required due to surface porosity, surface profile, variations in level and wastage etc.
SUBSTRATE QUALITY
Hardened / old concrete
Surfaces must be sound, open textured, clean, free from frost, laitance, surface water, oils, grease, coatings, all loosely adhering particles and other surface contaminants.
If in doubt apply a test area first.
Note that Sikafloor® CureHard-24 used a a general sealer will not penetrate burnished or fully polished concrete and is not suitable for this appliction.
For best results with new concrete floors wait for 7–14 days after placement or until after cement has sufficiently hydrated prior to treatment with Sikafloor® CureHard-24.
SUBSTRATE PREPARATION
Hardened / old concrete
The substrate must be prepared by suitable cleaning method such as high pressure water cleaning or by ride-on cleaning machines. Allow drying prior to application. All dust, dirt, loose and friable material must be completely removed from all surfaces before application of the product, preferably by brush and / or vacuum.
APPLICATION
Hardened Concrete Full hardening - densifying process
Apply in a continuous film using a high volume low pressure spray unit.
To ensure maximum penetration, scrub material into the surface with a soft bristle broom or floor-scrubbing machine (min. 30 minutes), until the material begins to gel and becomes slippery. Wet the material slightly with a water spray and rework it into the surface for another 10 to 20 minutes. After this process, rinse the floor and remove any excess material using a squeegee, wet vacuum or mop.
On porous, rough-textured or broom-finished surfaces, a second coat may be required.
For large surfaces and higher placing rates, mechanical equipment such as ride-on cleaning machines can be also used to place, brush in and remove the excess material from the surface.
Thanks to proceeding chemical reaction the rate of water-tightness increases gradually, whereas maximum sealing and hardening effect occurs earliest after 7 days. Gloss of the surface gradually increases during 30 to 90 days depending upon cleaning frequency.
As a densifier in grind/polish system
Apply Product by spray or squeegee to the surface at the 80 grit stage of grinding. Two applications are recommended. If product is applied at the polishing stage uneven colour may result. Do not use Sikafloor® CureHard-24 as a final sealer on polished, finished floors as a sealer - it will not penetrate and will result in an unsatisfactory outcome that will have to be stripped off.
As a general sealer
Apply with manual spray equipment or roller at a rate of approx 8-10m2 per litre depending on the porosity of the substrate. Apply evenly without any excess product or pooling on the surface. Two coats recommended. Do not allow excess product to remain on the surface - whitening or stickiness of the excess product may occur and leave discolouration. Do not apply as a general sealer on fully burnished/closed/dense concrete surfaces as it will be unable to pentrate.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with water immediately after use.
Hardened / cured material can only be mechanically removed.