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Sikafloor®-161 HC

Multipurpose epoxy primer and binder for levelling screeds and mortars

Sikafloor®-161 HC is a 2-part, low viscosity multipurpose filled epoxy resin for priming and levelling concrete and cementitious substrates.

  • Low viscosity
  • Good penetration
  • Excellent bond strength

Usage

  • For priming concrete substrate, cement screeds and epoxy mortars
  • For low to medium absorbent substrates
  • Primer for the Sikafloor®-264 HC N flooring systems
  • Binder for levelling mortars and mortar screeds
  • Intermediate layer underneath of Sikafloor®-264 HC N

Packaging

Part A+B

20 kg set

Part A

15.8 kg container

Part B

4.2 kg container

Advantages

  • Compatible with all varieties of Portland Cement including Slag Cement
  • Good penetration
  • Excellent bond strength
  • Solvent free
  • Easy application
  • Short waiting times
  • Multi-purpose

Colour

Part A – Resin

Liquid, brownish-transparent

Part B – HardenerLiquid, yellow-transparent

Product Details

Chemical base

Epoxy

 

Shelf life

12 months from date of production if stored properly in original, unopened and undamaged sealed packaging.

 

Storage conditions

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +30 °C

 

Density

Part A

~1.6 kg/L

Part B~1.0 kg/L
Mixed Resin~1.45 kg/L

 

Solid content by weight

~100 %

 

Solid content by volume

~100 %

Shore D hardness

~76 (7 d, +27 °C)

(DIN 53 505)

 

Compressive strength

~50 N/mm2 (resin : Sika® Quartz 01 IN = 1 : 0.9) (28 d, +27 °C)

(EN 196-1)

 

Flexural strength

~30 N/mm2 (resin : Sika® Quartz 01 IN = 1 : 0.9)(28 d, +27 °C)

(EN 196-1)

 

Tensile adhesion strength

> 1.5 N/mm2 (failure in concrete)

(EN 1542)

 

Heat resistance

IMPORTANT

No simultaneous mechanical and chemical strain

While the product is exposed to temperatures up to +60 °C, do not also subject it to chemical and/or mechanical strain, as it may cause damage to the product.

ExposureDry heat
Short-term, maximum 7 days+60 °C

 

Chemical resistance

Resistant to many chemicals. Please ask for a detailed chemical resistance table.

Application

Mixing ratio

Part A : Part B = 79 : 21 (by weight)

 

Ambient air temperature

+10 °C min. / +30 °C max.

 

Relative air humidity

80 % r.h. max.

 

Dew point

Beware of condensation!

The substrate and uncured floor must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the floor finish.

Note: Low temperatures and high humidity conditions increase the probability of blooming.

 

Substrate temperature

+10 °C min. / +30 °C max.

 

Substrate moisture content

< 4 % pbw moisture content.
Test method: Sika®-Tramex meter, CM-measurement or Oven-dry-method.
No rising moisture according to ASTM (Polyethylene-sheet).

 

Pot life

TemperatureTime
+10 °C~50 min
+20 °C~25 min
+30 °C~15 min

 

Curing time

Before applying solvent free products on Sikafloor®-161 HC allow:

Substrate temperatureMinimumMaximum
+10 °C24 h4 d
+20 °C12 h2 d
+30 °C8 h24 h

Before applying solvent containing products on Sikafloor®-161 HC allow:

Substrate temperatureMinimumMaximum
+10 °C36 h6 d
+20 °C24 h4 d
+30 °C16 h2 d

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

 

Applied product ready for use

Substrate temperatureFoot trafficLight trafficFull cure
+10 °C~24 h~6 d~10 d
+20 °C~12 h~4 d~7 d
+30 °C~8 h~2 d~5 d

Note: Times are approximate and will be affected by changing ambient and substrate conditions.

Consumption

Coating SystemProductConsumption

Priming

Sikafloor®-161 HC

0.25–0.50 kg/m2

Bonding bridge

Sikafloor®-161 HC

0.25–0.50 kg/m2

Levelling mortar fine (surface roughness < 1 mm)1 pbw Sikafloor®-161 HC + 0.5 pbw Sika® Quartz 04 IN1.7 kg/m2/mm
Levelling mortar medium (surface roughness up to 2 mm)1 pbw Sikafloor®-161 HC + 0.8 pbw Sika® Quartz 01 IN1.8 kg/m2/mm
Epoxy screed (15–20 mm layer thickness) / Repair mortar1 pbw Sikafloor®-161 HC + 7 pbw quartz sand2.2 kg/m2/mm

Note: These figures are theoretical and do not allow for any additional material required due to surface porosity, surface profile, variations in level, wastage or any other variations etc. Apply product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.

SUBSTRATE QUALITY

  • The concrete substrate must be sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum pull off strength of 1.5 N/mm2.
  • The substrate must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings and surface treatments, etc.

 

SUBSTRATE PREPARATION

MECHANICAL SUBSTRATE PREPARATION

 

IMPORTANT

 

Exposing blow holes and voids

 

When mechanically preparing the surface, make sure to fully expose blow holes and voids.

 

  1. Remove weak cementitious substrates.
  2. Prepare cementitious substrates mechanically using abrasive blast cleaning or planing / scarifying equipment or grinding to remove cement laitance.
  3. Before applying thin layer resins, remove high spots by grinding.
  4. Use industrial vacuuming equipment to remove all dust, loose and friable material from the application surface before applying the Product.
  5. Use products from the Sikafloor®, Sikadur® and Sikagard® range of materials to level the surface or fill cracks, blow holes and voids.

 

Contact Sika® Technical Services for additional information on products for levelling and repairing defects.

 

TREATMENT OF JOINTS AND CRACKS
Construction joints and existing static surface cracks in substrate require pre-treating before full layer application. Use Sikadur® or Sikafloor® resins.

 

MIXING

Note: To increase the viscosity of the Product you can add Sika® Extender T or Sikafloor® Quartz Flour.
 

PRIMER MIXING PROCEDURE

 

  1. Mix Part A (resin) for ~30 seconds.
  2. Add Part B (hardener) to Part A.
  3. IMPORTANT Do not mix excessively. Mix Part A + B continuously for ~3 minutes until a uniform mix is achieved.
  4. To ensure thorough mixing, pour materials into another container and mix again to achieve a smooth and uniform mix.
  5. During the final mixing stage, scrape down the sides and bottom of the mixing container with a flat or straight edge trowel at least once to ensure complete mixing.

  

LEVELLING MORTAR AND RESIN SCREED MIXING PROCEDURE

 

  1. Mix Part A (resin) for ~30 seconds.
  2. Add Part B (hardener) to Part A.
  3. While mixing Parts A + B, gradually add the required filler or aggregates.
  4. IMPORTANT Do not mix excessivley. Mix for a further 2 minutes until a uniform mix is achieved.
  5. To ensure thorough mixing, pour materials into another container and mix again to achieve a smooth and uniform mix.
  6. During the final mixing stage, scrape down the sides and bottom of the mixing container with a flat or straight edge trowel at least once to ensure complete mixing.

  

MIXING TOOLS

 

Sikafloor®-161 HC must be thoroughly mixed using a low speed electric stirrer (300 – 400 rpm) or other suitable equipment. For the preparation of mortars use a forced action mixer of rotating pan, paddle or trough type. Free fall mixers should not be used.

 

APPLICATION

IMPORTANT

 

Protect from moisture

Prior to application, confirm substrate moisture content, r.h. and dew point.

If > 4 % pbw moisture content, Sikafloor® EpoCem® may be applied as a T.M.B. (temporary moisture barrier) system.

After application, protect the Product from damp, condensation and direct water contact for at least 24 hours.

 

Pin holes

 

If the Product is applied on porous substrates during rising temperatures, pin holes may form from rising air.

 

  1. Apply the Product during falling temperatures.

 

Closing Pin holes

 

If pin holes are present after the Product has cured blistering may occur in the subsequent layer. Close any pin holes using the following steps.

 

  1. Lightly grind the cured surface.
  2. Apply a scratch coat consisting of the Product Sikafloor®-161 HC mixed with Sikafloor® Quartz Flour or Sika® Extender T.

  

STANDARD PRIMER APPLICATION

 

  1. Pour the mixed Product onto the substrate. Note: The consumption is specified in Application Information.
  2. Apply the Product evenly over the surface with a short pile roller or a squeegee.
  3. Back roll the surface in two directions at right angles with a fleece roller. Note: Maintain a “wet edge” during application to achieve a seamless finish.
  4. If broadcasting is required, wait between 15 and 30 minutes, then broadcast the surface with quartz sand. Broadcast lightly at first, then to excess.
  5. IMPORTANT Confirm waiting or overcoating time is achieved before applying subsequent products. (Refer to the “waiting time to overcoating” section of Application Information). Once the product has hardened sufficiently, remove all loose sand with industrial vacuuming equipment.

  

LEVELLING MORTAR / SCRATCH COAT

Equipment:

 

  • Squeegee
  • Trowel
  1. Pour the mixed Product onto the substrate. Note: The consumption is specified in Application Information.
  2. Apply the Product evenly over the surface with a trowel or a squeegee.

  

BONDING BRIDGE

 

  1. Pour the mixed Product onto the substrate. Note: The consumption is specified in Application Information.
  2. Apply the Product evenly over the surface with a brush, fleece roller or a squeegee.
  3. Back roll the surface in two directions at right angles with a fleece roller. Note: Maintain a “wet edge” during application to achieve a seamless finish.
  4. (Optional) If required, apply a second priming coat.

  

RESIN SCREED

 

IMPORTANT

 

Not suitable for contact with water

 

The Product is not suitable for contact with water unless sealed with seal coat.

 

  1. Pour the mixed Product “wet on wet” onto the still tacky primer. Note: The consumption is specified in Application Information.
  2. Spread and compact the Product with a trowel to the required thickness between screed rails / battens, if installed.
  3. Level the screed surface with a levelling beam spanning onto the screed rails / battens.
  4. Finish the surface to the required surface texture with trowels or walk-behind power floats.

  

RESIN PATCH REPAIR MORTAR

 

  1. Pour the mixed Product “wet on wet” onto the still tacky primer.
  2. Apply the Product with a trowel to the required thickness.
  3. Compact the applied product with a trowel.
  4. IMPORTANT Confirm waiting or overcoating time is achieved before applying subsequent products. (Refer to the “waiting time to overcoating” section of Application Information). Smoothen the surface with a trowel.

 

CLEANING OF TOOLS

Clean all tools and application equipment with Thinner C immediately after use. Hardened / cured material can only be mechanically removed.

 

Document

  • Product Data Sheet (PDS)