Product Data Sheet
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Sika® Primer MB

Solvent-free epoxy primer and moisture barrier for wood floor bonding

Sika® Primer MB is a 2-component epoxy primer and moisture barrier for SikaBond wood flooring adhesives applied on difficult substrates.

  • 2-Component
  • Reactive epoxy
  • Solvent-free
  • Easy to apply, low viscosity
  • Allows quick completion
  • Good penetration and stabilization of the substrate
  • Suitable for refurbishing existing substrates
  • Suitable for use with underfloor heating
Product Data Sheet
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Usage

Sika® Primer MB is designed for use in conjunction with SikaBond wood flooring adhesives:
  • For moisture control on cement-based substrates with moisture contents of up to 6 % CM.
  • For substrate consolidation on concrete, cement and anhydrite screeds and refurbished substrates.
 

Advantages

  • 2-Component
  • Reactive epoxy
  • Solvent-free
  • Easy to apply, low viscosity
  • Allows quick completion
  • Good penetration and stabilization of the substrate
  • Suitable for refurbishing existing substrates
  • Suitable for use with underfloor heating

Packaging

Component A

3 kg pail

Component B

1 kg pail

Component A+B

4 kg 

Colour

Blue

Product Details

Product Information

Chemical Base

2-Component, epoxy resin compound

Shelf Life

Sika® Primer MB has a shelf life of 24 months from the date of production, if stored properly in undamaged, original, sealed packaging, and if the storage conditions are met.

Storage Conditions

Sika® Primer MB shall be stored in dry conditions, protected from direct sunlight and at temperatures between +5 °C and +25 °C.

Density

Component A

~1.10 kg/l

Component B

~1.00 kg/l

Mixed

~1.10 kg/l
Technical Information

Shore A Hardness

~80 (after 7 d)

(ISO 868)

Compressive Strength

~70 N/mm2 (after 7 d)

(EN 196 part 1)

Service Temperature

−40 °C min. /  +70 °C max.

Thermal Resistance

Sika® Primer MB can be permanently exposed to dry heat ≤ +50 °C and temporarily exposed to dry heat ≤ +80 °C.

Note: In order to avoid damage to the installed wood floor elements, surface temperature must not exceed +25 °C.

Application

Application Information

Mixing Ratio

Component A : Component B = 100:37 (by volume)

Ambient Air Temperature

+10 °C min. / +30 °C max., min. 3 °C above dew point temperature

Relative Air Humidity

< 80 %

Substrate Temperature

During laying and until Sika® Primer MB has fully cured, the substrate and ambient temperatures shall be between +10 °C and +30 °C where there is no underfloor heating and between +20 °C and +30 °C where there is underfloor heating.

Substrate Moisture Content

Permissible substrate moisture content without underfloor heating

For cement screeds<6 % CM
For anhydrite screeds<0.5 % CM
For magnetite flooring3–12 % CM (depending on the organic content)

Permissible substrate moisture content for use with underfloor heating

For cement screeds<6 % CM
For anhydrite screeds<0.3 %
For magnetite flooring

3–12 % CM (depending on the organic content)

To check the moisture content, use the “Rubber Mat Test”, according to ASTM. A polyethylene sheet of > 1x1 m in dimension shall be taped to the concrete surface. Leave the polyethylene sheet in place for > 24 hours  prior to testing. This test allows for the detection of any condensed vapour transmissions.
Notes: (1) CM = carbide method, which is used to determine the moisture content of the substrate. (2) In regards to moisture content and quality of substrates, the guidelines of the wood floor manufacturer as well as standard construction rules must be observed.

Pot Life

Ambient air temperaturePot life
+10 °C~60 min
+20 °C~30 min
+30 °C~15 min

Note: Do not use mixed material after pot life.

Curing Time

ConditionsCuring time
+10 °C~18 h
+20 °C~12 h
+30 °C~6 h

Note: Curing speed is dependent on temperature, relative humidity and absorption of substrates. High temperature and low r.h. decrease curing time. Cured material becomes transparent.
Consumption

Consumption

Concrete and/or cement screeds and anhydrite screeds, including flowable anhydrite screeds

400–600 g/m2, depending on the absorbency of the substrate.

Broadcast mastic asphalt250–300 g/m2
Application steps

APPLICATION INSTRUCTIONS

For the application of Sika® Primer MB all generally accepted rules for wood flooring installation apply.

SUBSTRATE PREPARATION

  • The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Paint, cement laitance and other poorly adhering contaminants must be removed.
  • At least 50 % of the surface area must be cleared of residual adhesive (i.e. by grinding).
  • Preliminary bond strength testing is recommended.
  • Compressive strength: > 8 N/mm2
  • Tensile Bond strength: > 0.8 N/mm2
  • Concrete and/or cement screeds must be ground and thoroughly cleaned with an industrial vacuum.
  • Anhydrite screeds, including flowable anhydrite screeds must be ground and thoroughly cleaned with an industrial vacuum shortly before coating.
  • Broadcast mastic asphalt must be broadcasted to excess and thoroughly cleaned with an industrial vacuum.
  • On fibre reinforced concrete any exposed fibres must be burnt off the surface.
  • The guidelines of the screed floor manufacturer apply.
  • For project specific advice, please contact Sika technical service for assistance.

MIXING

Add component B to component A in the correct ratio using an electric stirrer at a low speed (300–400 rpm).
A minimum mixing time of 3 minutes is required; stirring shall continue until the mix becomes homogeneous. Pour mixed material into a clean container and mix again.

CLEANING OF TOOLS

Clean all tools and application equipment immediately after use with Sika Thinner C. Once cured, residual material can only be removed mechanically.

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