Product Data Sheet Show all documents

SikaTop®-551 Seal

(former MSeal 551)

Acrylic reinforced cementitious, flexible waterproofing coating

SikaTop®-551 Seal is a two-component acrylic modified cementitious coating applied by brush, roller or trowel to waterproof and resurface concrete, masonry, and most other construction materials.
SikaTop®-551 Seal provides an effective barrier to waterborne salts and atmospheric gases. Fluid applied, SikaTop®-551 Seal provides a hard wearing, seamless, waterproof membrane for roofs and foundation protection.

  • Protects against carbonation - A 1mm coating provides anti carbonation cover equivalent to over 80cm of concrete
  • Waterproof – Suitable for internal and external waterproofing
  • Excellent adhesion - Bonds to porous and non-porous surfaces
  • Flexible – Copes with the thermal movement of concrete structures
  • Suitable for contact with potable water – Can be used for lining concrete water tanks
  • Vapour permeable - Whilst repelling water, allows concrete to breathe thus preventing osmosis
  • Compatable with moist surfaces - Can be applied to 24 hour-old concrete thereby giving immediate protection
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Product Data Sheet Show all documents

Usage

SikaTop®-551 Seal is ideal:
  • To reface and even out variations in concrete surfaces
  • As a waterproof lining for water retaining structures
  • For coating seawater channels
  • Sealing and coating tie bar holes to ensure water tightness
  • To provide foundation protection
  • As a waterproof coating for wet areas and sunken slabs.
  • As a backing to marble and granite to prevent water ingress and thus alleviate surface staining
  • To provide protection to concrete surfaces from carbonation and chloride attack.
 

Advantages

  • Protects against carbonation - A 1mm coating provides anti carbonation cover equivalent to over 80cm of concrete
  • Waterproof – Suitable for internal and external waterproofing
  • Excellent adhesion - Bonds to porous and non-porous surfaces
  • Flexible – Copes with the thermal movement of concrete structures
  • Suitable for contact with potable water – Can be used for lining concrete water tanks
  • Vapour permeable - Whilst repelling water, allows concrete to breathe thus preventing osmosis
  • Compatable with moist surfaces - Can be applied to 24 hour-old concrete thereby giving immediate protection

Packaging

SikaTop®-551 Seal is available in 20 kg double pack. Consisting of 5 kg Liquid part A 15 kg powder part B

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

BS 1881 Part 208: 1996 - I.S.A.T.
WRAS - "Suitable for use in contact with potable water" - BS 6920: 2000
BS 476: Part 6: 1989 - Fire tests on building material: and structures - Method of test for fire propagation for products. DIN 1048 Water Penetration Test
Product Information

Shelf Life

SikaTop®-551 Seal can be kept for 6 months in original unopened packing when stored indoors.

Storage Conditions

Do not store in direct sunlight and avoid allowing the material to freeze which will render the material unusable. Must keep between 5 - 35ºC.

Density

1940 kg/m³

Volatile organic compound (VOC) content

0.5 g/L
(HK prod code P10-17)
Technical Information

Water Penetration under Pressure

7 bars – no leakage (at 2mm DFT)

Chloride Ion Diffusion Resistance

Not measurable after 24 months of testing

Elongation at break

>5% unbonded

Application

Application Information

Layer Thickness

Coverage 1.94 kg / m² at 1 mm thickness
Recommended thickness 2mm DFT
Application steps

SURFACE PREPARATION

Correct substrate preparation is critical for optimum performance. Surfaces should be structurally sound direct tensile strength of more than 1.5MPa via a pull off tester with a load rate of 100N/s), clean, and free from laitance, loose particles, oil and grease, old coatings, curing compounds or any other contaminants. Mechanical wire brushing may be appropriate for small areas.
Prior to priming use SikaEmaco® repair mortars to achieve a smooth and level surface by filling holes and irregularities 

MIXING

SikaTop®-551 Seal is supplied in premeasured units and should be mixed on site utilising clean containers. Slowly add the powder to the liquid and mix, using a slow speed (300rpm) drill fitted with a suitable paddle.

MIX and USE; do not mix more material than can be used in one hour. Do not apply to dry concrete.
Saturate concrete surfaces with clean water and apply whilst still damp (saturated surface dry), using a short, stiff bristle brush or roller. Trowel application can be undertaken as necessary.

 

For heavy 6-10mm depressions, honeycombs etc. use less gauging liquid and mix to the desired consistency. Where more than one coat is found necessary to achieve the desired thickness, apply the second or subsequent coats after the previous coat has dried.
It is recommended, for general resurfacing, that each coat should be a minimum of 1mm thick.
Spray application is recommended for large areas,

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