Product Data Sheet Show all documents
Sikagard®-720 EpoCem®

Sikagard®-720 EpoCem®

3-PART CEMENT AND EPOXY COMBINATION PORE FILLER AND LEVELLING MORTAR

Sikagard®-720 EpoCem® is a 3-part, epoxy modified, cementitious, fine textured mortar for levelling and finishing concrete, mortar or stone surfaces.

  • Improved chemical resistance compared to PCC mortars
  • Good protection of concrete in aggressive environments
  • Waterproof
  • Vapour permeable
  • Application range 0.5–3 mm on vertical and horizontal surfaces
  • Good adhesion to damp or dry concrete
  • Fast overcoating of Sika® resin-based finish products
  • Good surface finishing
  • Does not require overcoating
  • Manual and machine application (wet spray technique)
Product Data Sheet Show all documents

Usage

Sikagard®-720 EpoCem® may only be used by experienced professionals.
  • Thin layer render
  • Concrete pore filler/ levelling mortar
  • Repairing minor defects (pores and honeycombed concrete)
  • Protecting concrete in aggressive and chemical environments
  • As a Temporary Moisture Barrier (TMB) for Sikafloor® or Sikagard resin products
  • 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)
  • For interior and exterior use
  • Low concrete cover solution
 

Advantages

  • Improved chemical resistance compared to PCC mortars
  • Good protection of concrete in aggressive environments
  • Waterproof
  • Vapour permeable
  • Application range 0.5–3 mm on vertical and horizontal surfaces
  • Good adhesion to damp or dry concrete
  • Fast overcoating of Sika® resin-based finish products
  • Good surface finishing
  • Does not require overcoating
  • Manual and machine application (wet spray technique)

Packaging

Pre-dosed 20.75 kg kit.

Part A

1.07 kg plastic container - 89702

Part B

2.68 kg plastic container - 511060

Part C

17 kg ready to mix units - 511061

Colour

Part A - resin

white liquid

Part B - hardener

transparent yellow liquid

Part C - filleraggregate powder
Finished colourmatt grey

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

  • Potable Water approved to AS/NZS 4020:2018 - Testing of products for use in contact with drinking water
  • Carbon Dioxide diffusion resistance- SGS Certificate No.16302
  • CE Marking and Declaration of Performance to EN 1504-2 - Surface protection product for concrete - Coating
  • CE Marking and Declaration of Performance to EN 1504-3 - Concrete repair product for structural repair
  • Suitability tests SIA 162/5, Sikagard®-720 EpoCem®, LPM, Test report No. A-29'212-1E
Product Information

Product declaration

Complies with the general requirements of EN 1504-3: Class R4.

EN 1504-2: Surface protection product for concrete - Coating.      

Composition

Epoxy modified cementitious mortar

Shelf life

Part A and Part B

12 months from date of production
Part C

Confirmed by producing company

Storage conditions

The product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.

Density

Part A~ 1.05 kg/l

Part B

~ 1.03 kg/l

Resin mixed

~ 1.30 kg/l
Parts A+B+C mixed~ 2.00 kg/l

All density values at +20 °C
System information

System structure

Important: The system structures as described must not be changed.

Substrate types

  • Green concrete (as soon as mechanical preparation is possible)
  • Damp concrete (> 14 days old)
  • Damp aged concrete (rising moisture)

Temporary moisture barrier (TMB)

  • Sikagard®-720 EpoCem® Thickness: 2.0 mm minimum

Pore filling, repair and levelling

  • Sikagard®-720 EpoCem®

Coating finishes

  • Suitable product from the Sikafloor® and Sikagard® range
 
Technical Information

Compressive strength

> 45 N/mm2  (28 days / +20 °C / 50 % r.h)

(EN 1504–3: Class R4)

(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

Service temperature

-30 °C min. / +80 °C max. for continuous exposure.

Permeability to carbon dioxide

Dry Film Thickness

5.5 mm

CO2 Diffusion Coefficient

8.3 x 10-06 cm2/sec

Diffusion Resistance Coefficient (μ)

19840

Equivalent Air Layer Thickness (R)110 m
Equivalent Thickness of
Concrete (Sc) *		270 mm

* A μc value of 400 has been found to be typical of an ‘average quality’ concrete for calculation of Sc.

Sulfate resistance

High Sulphate Resistance

(ASTM C 1012)

Freeze thaw de-icing salt resistance

Resistance Factor WFT–99 % (High)

(EN196–1)

Reaction to fire

Class A2(fl) S1

(EN 13501–1)

Application

Application Information

Layer thickness

Temporary moisture barrier (TMB): 2.0 mm minimum

Pore filling, repair and levelling: 0.5 mm min. / 3.0 mm max.

Pore filling and repairing small areas: (< 0.01 m2) 5.0 mm max

Ambient air temperature

+8 °C min. / +30 °C max.

Mixing ratio

Packaging size

Part A : Part B : Part C = 1.07 kg : 2.68 kg: 17 kg
Mixing ratio

1 : 2.5 : 14 - 15 (by weight)

Substrate temperature

+8°C min. / +30°C max.

Pot Life

Temperature

Time

+10 °C

~ 80 minutes

+20 °C

~ 40 minutes

+30 °C~ 20 minutes

Curing time

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.

Waiting time to overcoating

Once Sikagard®-720 EpoCem® is tack free it is possible to apply vapour permeable resin finishes.
For the application of vapour tight resin finishes on Sikagard®-720 EpoCem®, allow the surface moisture to fall below 4 % and not earlier than:

Temperature

Time

+10 °C

~ 60 hours

+20 °C

~ 15 hours

+30 °C~ 8 hours

Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Consumption

Consumption

~ 2.0 kg/m2/mm
This figure is theoretical and does not allow for any additional material required due to surface porosity, surface profile, variations in level or wastage, etc.
Application steps

EQUIPMENT

Select the most appropriate equipment required for the project:

Substrate preparation equipment

  • Abrasive blast cleaning equipment
  • Planing machine
  • Scarifying machine
  • High pressure water blasting equipment
  • Mechanical hand held tools for breaking out concrete

For other types of preparation equipment, contact Sika Technical Services

Mixing equipment

IMPORTANT: Do not use free fall mixers.

  • 21 kgs: Electric single paddle mixer (300–400 rpm) with helical paddle
  • Up to 63 kg: Electric double paddle mixer (300–400 rpm) with helical paddle or forced action / rotating pan / double paddle or trough type mixer (300–400 rpm).
  • Scraper
  • Clean mixing containers (capacity ~30 L)

For other types of mixing equipment, contact Sika Technical Services

Application equipment: TMB

Mixed material carrier

  • Pin leveller
  • Trowels
  • Spiked roller

Manual application equipment: Pore filling, repair and levelling

  • Mixed material carrier
  • Plasterers hawk
  • Trowel

Sprayed application equipment: Repair and levelling

  • Aliva Hopper gun
  • Putzmeister S-5 
  • Graco T-Max 405

For other types of spraying equipment, contact Sika Technical Services

Finishing equipment

  • Trowel (PVC or wooden)
  • Sponge

MIXING

Manual application or Wet spray application

IMPORTANT: Mix full units only

IMPORTANT: Do not add water

Requirement: Electric single or double paddle mixer (300–400 rpm) with helical paddle or forced action / rotating pan / double paddle or trough type mixer (300–400 rpm).

  1. Before mixing, shake Part A (white liquid) briefly until uniformly mixed.
  2. Pour mixed Part A into Part B container and shake vigorously for at least 30 seconds.
  3. Pour the mixed liquid (Parts A+B) into the mixing container.
  4. Stir Parts A+B slowly in the container with the mixing equipment and gradually add Part C.
  5. Mix for a further 3,0 minutes until a uniform lump free mix has been achieved.

APPLICATION

Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

IMPORTANT: Freshly applied Sikagard®-720 EpoCem® must be protected from damp, condensation and water for at least 24 hours.

IMPORTANT: When Sikagard®-720 EpoCem® is tack free, it is possible to apply vapour permeable coatings. When applying vapour impermeable coatings, always verify the surface moisture content is ≤4 %.

IMPORTANT: Freshly applied Sikagard®-720 EpoCem® must be protected from rain for at least 24 hours.

Note: Sikagard®-720 EpoCem® can be applied on green or damp concrete, without any standing water.

Note: Although the product can be applied onto green concrete (> 24 hours), it is advised to allow at least 3 days for early concrete shrinkage in order to prevent concrete shrinkage cracks from appearing on the mortar surface.

 

Manual application

  1. Thoroughly pre-wet the prepared substrate before application.
  2. Before application remove excess water, e.g. with a clean sponge. The surface must have a dark matt appearance and surface pores and cavities must not contain water.
  3. When used as a pore filler or levelling mortar, firmly scrape the mortar over the substrate to fill any pores or cavities.
  4. Apply the levelling or repair mortar on to the substrate between the minimum and maximum layer thicknesses without the formation of voids. A seamless finish can be achieved if a “wet” edge is maintained during application.

 

Sprayed application - Wet Spray

  1. Thoroughly pre-wet the prepared substrate before application.
  2. Before application remove excess water, e.g. with a clean sponge. The surface must have a dark matt appearance and surface pores and cavities must not contain water.
  3. Place the wet mortar into the spraying equipment and apply on to the substrate between the minimum and maximum layer thicknesses without the formation of voids. A seamless finish can be achieved if a “wet” edge is maintained during application.

 

Surface finishing

IMPORTANT: Do not add water during the surface finishing as this can cause discolouration and cracking.

  1. Allow mortar to surface harden.
  2. Surface finish to the required surface texture using trowel and / or sponge.

CLEANING OF EQUIPMENT

Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.

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