Sikagard®-720 EpoCem®
Sikagard®-720 EpoCem® is a three part, epoxy modified cementitious, thixotropic, fine textured mortar for levelling and finishing of concrete, mortar or stone surfaces.
- Improved chemical resistance compared to PCC mortar
- Excellent protection of concrete in aggressive environments
- CE marked in accordance with EN 1504 parts 2 and 3
- Impervious to liquids but permeable to water vapour
- Excellent bond to green or hardened concrete whether damp or dry
- Fast overcoating of Sika® resin based finish products
- Ideal preparation for smooth surface finishes
- For internal or external use
- Contains no solvents
- Can be applied by hand or mechanically
Usage
- As a levelling layer over concrete and mortars in 0.5–3 mm on vertical or horizontal surfaces.
- Application in new works or damaged concrete, in aggressive chemical environments
- Application over high moisture content substrates, even green concrete
- As a Temporary Moisture Barrier (TMB) (min. 2 mm thick) allowing the application of Epoxy, Polyurethane and PMMA* resin coatings requiring dry substrates, for a lasting solution.
- As a pore sealer for the reprofiling, smoothing and levelling of concrete surfaces
- Suitable for moisture control (Principle 2, method 2.3 of EN 1504-9)
- Suitable for restoration work (Principle 3, method 3.1 and 3.3 of EN 1504-9).
- Suitable for physical resistance (Principle 5, method 5.1 of EN 1504-9)
- Suitable for preserving or restoring passivity (Principle 7, method 7.1 and 7.2 of EN 1504-9)
- Suitable for increasing resistivity (Principle 8, method 8.3 of EN 1504-9)
Advantages
- Improved chemical resistance compared to PCC mortar
- Excellent protection of concrete in aggressive environments
- CE marked in accordance with EN 1504 parts 2 and 3
- Impervious to liquids but permeable to water vapour
- Excellent bond to green or hardened concrete whether damp or dry
- Fast overcoating of Sika® resin based finish products
- Ideal preparation for smooth surface finishes
- For internal or external use
- Contains no solvents
- Can be applied by hand or mechanically
Packaging
Pre-dosed 21 kg sets.
Part A | 1.14 kg plastic container |
Part B | 2.86 kg plastic container |
Part C | 17 kg ready to mix units |
Colour
| Part A-resin | white liquid |
| Part B - hardene | transparent yellow liquid |
| Part C - filler | Aggregate powder |
| Finish Colour | Matt grey |
Product Details
APPROVALS / STANDARDS
- Qualification tests in accordance with Swiss Standard SIA 162/5, Ref. A-29’212-1E, dated September 26th, 2005 by LPM AG, Beinwil am See, Switzerland
- Surface protection system for concrete, method coating, according to EN 1504-2:2004, provided with the CE marking
- Structural and non structural repair product for concrete according to EN 1504-3:2005, provided with the CE marking
Chemical Base
Epoxy modified cementitious mortar.
Shelf Life
| Part A, part B | 12 months |
| Part C | * confirm with producing company |
Storage Conditions
The product must be stored in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between +5 °C and +30 °C.
Part A, part B: Protect from frost
Part C: Protect from humidity
Density
| Part A | ~1.05 kg/l |
| Part B | ~1.03 kg/l |
| Mixed resin | ~1.30 kg/l |
| Mixed A+B+C: | ~2.00 kg/l |
all density values at +20 °C
System Structure
The system configuration as described must be fully complied with and may not be changed.
Priming as indicated below is suitable for each of these substrates:
- Green concrete (as soon as mechanical preparation is possible)
- Damp concrete (> 14 days old)
- Damp aged concrete (rising moisture)
Vertical or horizontal pore filling, repair and levelling:
| Layer thickness | 0.5–3 mm |
| Primer | Water saturation with matt, damp appearance |
| Render | Sikagard®-720 EpoCem® |
| Top coating | can be left un-coated or suitable product from the Sikafloor® and Sikagard® range can be used as soon as the surface humidity of Sikagard®-720 EpoCem® has reached 4% |
Compressive Strength
| > 45 N/mm2 (28 days / +20 °C / 50 % r.h) (Class R4 as per EN 1504–3) | (EN196–1) |
Flexural Strength
| > 5 N/mm2 (28 days / +20 °C / 50 % r.h) | (EN196–1) |
Coefficient of Thermal Expansion
~13 × 10–6 1/K
Reaction to Fire
| Class A2(fl) S1 | (EN 13501–1) |
Freeze Thaw De-Icing Salt Resistance
| Resistance Factor WFT–99 % (High) | (EN196–1) |
Sulfate Resistance
| High Sulphate Resistance | (ASTM C 1012) |
Diffusion resistance to carbon dioxide
| µC02 ~5400 | (EN 1062–6) |
Service Temperature
-30 °C min. / +80 °C max. for continuous exposure.
Application
Mixing Ratio
Part A : part B : part C - packaging size: 1.14 : 2.86 : 17 kg
Mixing ratio: 1 : 2.5 : 14 - 15 (by weight)
Layer Thickness
Min.: 0.5 mm / Max.: 3 mm
Isolated and confined small areas (< 0.01 m2) up to 5 mm
Ambient Air Temperature
+8 °C min. / +30 °C max.
Substrate Temperature
+8°C min. / +30°C max.
Pot Life
| Temperature | Time |
| +10 °C | ~80 minutes |
| +20 °C | ~40 minutes |
| +30 °C | ~20 minutes |
21 kg unit
Waiting Time / Overcoating
Once Sikagard®-720 EpoCem® is tack free it is possible to apply vapour permeable seal coats.
For the application of vapour tight coatings on Sikagard®-720 EpoCem®, allow the surface moisture to fall below 4 %, not earlier than:
| Temperature | Time |
| +10 °C | ~60 minutes |
| +20 °C | ~15 minutes |
| +30 °C | ~8 minutes |
Curing Treatment
| Temperature | Full cure |
| +10 °C | ~14 days |
| +20 °C | ~7 days |
| +30 °C | ~4 days |
Note: All cure times are approximate and will be affected by changing substrate and ambient conditions.
Consumption
Screed / Mortar / Render:
~2.0 kg/m2/mm
This figure is theoretical and does not include for any additional material required due to surface porosity, surface profile, variations in level or wastage, etc.
MIXING
Prior to mixing, shake part A (white liquid) briefly until homogenous, then pour into the container of part B and shake vigorously for at least 30 seconds. When dosing out of drums, stir and homogenise first.
Pour the mixed binder (A+B) into a suitable mixing container (capacity of about 30 litres) and gradually add part C while stirring with a power mixer. Mix thoroughly for 3 minutes until a uniform mix has been achieved, with no lumps.
Mix only full units of A+B+C components. Do not mix smaller amounts. Do not add water.
Mixing Tools
Mix using a slow speed electric mixer (300 - 400 rpm) with helical paddle or other suitable equipment.
For mixing 2–3 bags at once, single or counter rotating double mortar (basket type) and forced action (pan type) mixers are also suitable. Free fall mixers must not be used.
APPLICATION
Hand application:
Place mixed Sikagard®-720 EpoCem® onto the matt-damp substrate and spread evenly to the required thickness with a trowel or spatula. If necessary, it may be finished with a moist neoprene sponge or brush.
Mechanical Application:
Placement on to the surface can also be done using a hopper gun or wet spray technique. For example an Aliva Hopper gun, a Putzmeister S-5 or a Graco T-Max 405. Subsequent finishing by hand is required.
Do not use additional water, which would disturb the surface finish and cause discolouration.
Freshly applied Sikagard®-720 EpoCem® must be protected from rain for at least 24 hours.
Once Sikagard®-720 EpoCem® is tack free it is possible to apply vapour permeable seal coats. Always verify that surface moisture < 4 % when applying vapour tight coatings.
A seamless finish can be achieved if a “wet” edge is maintained during application.
Note:
Sikagard®-720 EpoCem® can be applied on green or damp concrete, without any standing water.
Although the product can be applied onto green concrete surfaces (> 24 hours), it is advised to allow at least 3 days for early shrinkage of concrete to occur in order to prevent concrete shrinkage cracks from appearing on the screed/render surface.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be mechanically removed.