Product Data Sheet Show all documents

Sikagard® P 770

(former MasterSeal® P 770)

2-Component Xolutec® Primer for resin-based Sikagard®- and Sikalastic®-coatings

Sikagard® P 770 is a two-component primer based on Xolutec® - Technology, providing high substrate penetration and acting as bond promoter for the subsequent systems, e.g. Sikagard®-7000 CR. Xolutec is an innovative and smart way of combining complementary chemistries. When the material is mixed on site a cross linked interpenetrating network (XPN) is formed enhancing the overall material properties. By controlling the cross-linking density, the properties of Xolutec can be adjusted depending on the product performance required, e.g. this allows the formulation of materials with varying degrees of toughness and flexibility. Xolutec is very low in volatile organic components (VOC), is quick and easy to apply with both spray and hand application depending on requirements. It cures rapidly even at low temperature, reducing application time thus enabling fast return to service and minimizing downtime. This technology is not sensitive to moisture and tolerates a wide variety of different site conditions, greatly expanding the application window and reducing the potential for delays and failures. Long maintenance cycles and lower life cycle costs significantly reduce total cost of ownership.  

  • Low viscosity
  • Easy to apply
  • Excellent penetration
  • Seals pores and capillaries
  • Moisture tolerant: can be applied on substrates with high residual humidity.
  • Certified radon tightness
  • Excellent bond to substrate
  • Does not contain solvents.
Product Data Sheet Show all documents

Usage

Sikagard® P 770 is used as primer on mineral substrates for several approved Sikagard® and Sikalastic® systems. It will improve the adhesion and prevent the appearance of pinholes or bubbles in the subsequent hardened coating. Sikagard® P 770 is moisture tolerant and can be applied on substrates with high residual humidity.

Advantages

  • Low viscosity
  • Easy to apply
  • Excellent penetration
  • Seals pores and capillaries
  • Moisture tolerant: can be applied on substrates with high residual humidity.
  • Certified radon tightness
  • Excellent bond to substrate
  • Does not contain solvents.

Packaging

Sikagard® P 770 is available in 5 kg Kits consisting of 2.2 kg Part A and 2.8 kg Part B as well as 9 kg Kits consisting of 4 kg Part A and 5 kg Part B.

Colour

Milky-ivory liquids

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

  • CE Certification as Primer for Sikagard M 790 in the system Sikagard-7000 CR according to EN 1504-2.

  • Radon tightness certificate according ISO TS 11665-13.

  • Test report Determination of water-vapour transmission properties acoording to EN ISO 7783:2012

 
Product Information

Shelf life

12 months in unopened pails if stored under below mentioned storage conditions.

Storage conditions

Sikagard® P 770 must be stored in unopened, original containers under dry conditions at temperatures between 10 - 25° C preferably. Protect from frost and no permanent storage over +30 °C.

Density

Part A

approx. 1.25 g/cm³

Part B

approx. 1.17 g/cm³

Mixed

approx. 1.2 g/cm³

Viscosity

Part A

approx. 1140 mPas

Part B

approx. 125 mPas

Mixed

approx. 650 mPas
System information

Compatibility

Bond strength after 7 days curing at +20 °C on subsequent layers of

Sikagard M 790 (Xolutec)

≥ 2.5 N/mm²

Sikagard M 391 (epoxy)

≥ 2.5 N/mm²

Sikalastic M 689 (polyurea, hot-spray)

≥ 3.0 N/mm²

Sikalastic M 808 (polyurethane)

≥ 2.5 N/mm²

Sikalastic M 811 (polyurea-hybrid, hot-spray)

≥ 2.5 N/mm²

(EN 1542)

For other reactive resin coatings not mentioned here, we strongly recommend to conduct compatibility tests – please refer to the respective local technical department.

 
Technical Information

Tensile adhesion strength

on concrete at +5°C

≥ 4.0 N/mm²

on concrete at +20°C

≥ 4.0 N/mm²

on concrete at +30°C

≥ 4.0 N/mm²

(EN 1542)

Primer application only, measured after 7 days curing.

 

on fully vitrified tiles

≥ 2.0 N/mm²

on vitrified tiles

≥ 5.0 N/mm²

on non-vitrified tiles (glazed tiles)

≥ 2.5 N/mm²

(EN 1542)

Primer application only, measured after 7 days curing at +20 °C.

Softening point

Glass transition temperature after 28 days

109 °C

Permeability to water vapour

Coverage 200 g/m²

Class III (SD = 76 m)

Coverage 400 g/m²

Class III (SD = 108 m)

(EN ISO 7783)

Primer application only, no addditional coating.

Application

Application Information

Mixing ratio

Mixing ratio Part A : Part B (by weight)

approx. 1 : 1.26

Mixing ratio Part A : Part B (by volume)

approx. 1 : 1.35

Please note that Part B is the bigger part of the mix!

Ambient air temperature

+5 to 35 °C

Relative air humidity

Not restricted, but no condensation of water on the surface.

Dew point

The temperature of the contact surfaces must be at least 3 °C above the ambient dew point temperature.

Substrate temperature

+5 to +35 °C

Substrate moisture content

Not restricted, but surface must be visibly dry.

Pot Life

at +5 °C

approx. 30 min

at +10 °C

approx. 25 min

at +20 °C

approx. 20 min

at +30 °C

approx. 10 min

Curing time

Fully cured at +10 °C after

approx. 7 days

Fully cured at +20 °C after

approx. 5 days

Fully cured at +30 °C after

approx. 2 days

Tack free time

After approx. 5 hours at +20 °C.

Waiting time to overcoating

at +10 °C

approx. 11 hours

at +20 °C

approx. 5 hours

at +30 °C

approx. 2 hours
Consumption

Consumption

The consumption of Sikagard® P 770 is approximately 0.25 – 0.4 kg/m².

This consumption is theoretical and can vary according to the absorption and roughness of the substrate. It is essential to carry out representative trials on site to evaluate the exact consumption.
Application steps

SUBSTRATE PREPARATION

All substrates (new and old) must be structurally sound, dry, free of laitance and loose particles and clean of oil, grease, rubber skid marks, paint stains and other adhesion impairing contaminants.

Concrete surfaces should be prepared by shot blasting, high-pressure water jetting or other suitable mechanical method. After preparation, concrete and other cementitious substrates must have a minimum pull off strength of 1.5 N/mm² (lowest single value 1.0 N/mm²).

Very rough / irregular substrates on walls should be levelled before application with a suitable fairing coat, e.g. SikaEmaco® S 5800 DUO or Sika MonoTop®-3020. On floors a suitable repair or levelling solution should be used. It is essential to have all pores closed in mineral substrates before priming.

Wall/Floor connections must be rounded by using suitable products like e.g. SikaTop®-590 Seal, SikaEmaco® S 5440 RS or Sika MonoTop®-3130 Ultra Rapid.

The substrate should be visibly dry - there is no limit to residual humidity. Substrate temperature must be minimum +5 °C and maximum +35 °C. The temperature of the contact surfaces must be at least 3 °C above the ambient dew point temperature.

MIXING

Sikagard® P 770 is supplied in working kits which are pre-packaged in the exact mixing ratio.

Open the two Parts of the product and briefly mix the single components with a mechanical drill and paddle at low speed (max. 400 rpm) in order to obtain a uniform consistency.

Then pour the entire content of Part A into the container of Part B and mix with a mechanical drill and paddle at low speed (max. 400 rpm) for 90 seconds. Scrape the sides and the bottom of the container several times to ensure complete mixing. Keep the mixer blades submerged in the coating to avoid introducing air bubbles.

Do not mix part packs and do not mix by hand!

Attention: unused remains of mixed material can lead to a strong heat development in the pail. Always use up all mixed material completely.

Scratch Coat Mix:

Add oven dry, fine quartz sand (0.1-0.3 mm) in 1:1 ratio by weight to the mixed Sikagard® P 770 and briefly mix. Then add 1% Sika Extender T by weight (of Sikagard® P 770 + sand) to this mixture to achieve a thixotropic consistency.

Example: 5 kg sand + 5 kg Sikagard® P 770 (A+B mixed) + 100 g of Sika Extender T.

 

APPLICATION

After mixing, Sikagard® P 770 is applied to the prepared, smooth substrate by brush or roller. For spray application of Sikagard® P 770 please refer to our application manual for Sikagard®-7000 CR.

Sikagard® P 770 dries as an intense transparent film (within 5 hours @ 20° C). In case there are holes not covered by the primer, please apply a second coat of primer. Wait for at least 5 hours (@ 20° C) before applying further coatings like e.g. Sikagard® M 790.

In case the substrate is rough and/or filling of pinholes is required, please apply the scratch coat mixed as described in the mixing instructions. This mix can be easily applied on concrete surfaces by using a steel trowel.

The curing time of the material is influenced by the ambient, material and substrate temperatures. At low temperatures, the chemical reactions are slowed down; this lengthens the pot life, open time and curing times. High temperatures speed up the chemical reactions thus the pot life, open time and curing times are shortened accordingly. To fully cure, the material, substrate and application temperature should not fall below the minimum. The temperature of the contact surfaces must be at least 3 °C above the ambient dew point temperature.

We recommend overcoating the primer within the next 48 hours of its application. If this time is exceeded, please contact Sika's local Technical representative.

CLEANING OF EQUIPMENT

Tools can be cleaned with solvent-based cleaner while still wet. Once cured, the material can only be removed mechanically.

 

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