MasterSeal® 550

MasterSeal 550 is a two-part, acrylic-modified, cement-based coating that requires only on-site mixing, making it the ideal solution for waterproofing and resurfacing concrete, masonry, and various other construction materials. Applied with a stiff brush, roller, or trowel, it forms a waterproof, flexible layer. MasterSeal 550 serves as an effective barrier against waterborne salts and atmospheric gases. When applied as a liquid, it creates a durable, seamless waterproof membrane for roof and foundation protection.

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TYPICAL APPLICATIONS

  • Refacing and smoothing out concrete surfaces
  • Waterproof lining for water-retaining structures like tanks, pools, and reservoirs
  • Coating seawater channels
  • Sealing and coating tie bar holes for watertight protection
  • Waterproofing and safeguarding against brackish water
  • Foundation and retaining wall protection
  • Waterproof coating for roofs
  • Preventing water ingress on marble and granite surfaces, avoiding surface staining
  • Protection against carbonation and chloride attack on concrete surfaces
  • Suitable for pedestrian walkways in marine environments

ADVANTAGES

  • Anti-carbonation protection: A 1mm coating offers protection equivalent to more than 80cm of concrete.
  • Waterproof: Withstands up to 7 Bars (70 meters of head pressure) of water.
  • Excellent adhesion: Bonds effectively to both porous and non-porous surfaces.
  • Flexible: Adaptable to movements in the substrate.
  • Non-toxic: Safe for contact with potable water.
  • Pedestrian traffic: Suitable for light pedestrian traffic.
  • Breathable: Repels water while allowing the substrate to breathe.
  • High resistance: Offers strong resistance to carbon dioxide and chloride ion diffusion.
  • Immediate protection: Can be applied to concrete as soon as 24 hours old, offering immediate waterproofing without the typical 7-28 day curing period.

PACKAGING

MasterSeal 550 is available in grey and white, in a 20kg double pack (15kg powder + 5kg liquid).

COMPOSITION

MasterSeal 550 consists of carefully selected cements, silica sand, and reactive fillers in powder form, along with a liquid component made of blended acrylic copolymers and wetting agents.

TYPICAL PROPERTIES

  • Density: 1800kg/m³
  • Toxicity: Non-toxic
  • Water Penetration (DIN 1048): 7 bars – no leakage (2mm DFT)
  • Elongation: >5% (unbonded)
  • Water Vapour Coefficient: >3.64 x 10⁻⁴ cm²/s
  • Initial Surface Absorption: >95% reduction compared to control
  • CO₂ Diffusion Resistance: R > 357m, Sc > 89cm (1mm DFT)
  • Chloride Ion Diffusivity: No penetration at 90 days
  • Chloride Ion Diffusion Coefficient: 1.04 x 10⁻⁷ cm²/s
  • Oxygen Diffusion Coefficient: DO₂ 7.6 x 10⁻⁶ cm²/s
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