MasterSeal 550

MasterSeal 550 is a two-component, acrylic-modified cementitious coating that requires only on-site mixing. It is designed to waterproof and resurface concrete, masonry, and other construction materials. The product can be easily applied with a stiff brush, roller, or trowel to form a flexible, waterproof coating. MasterSeal 550 acts as an effective barrier against waterborne salts and atmospheric gases. When applied as a fluid, it creates a durable, seamless, waterproof membrane ideal for roof and foundation protection. The product consists of specially selected cements, silica sand, reactive fillers in powder form, and a liquid component of blended acrylic copolymers and wetting agents.

TYPICAL APPLICATIONS

• Refacing and evening out concrete surfaces.
• Waterproof lining for water-retaining structures.
• Coating seawater channels.
• Sealing and coating tie bar holes for watertightness.
• Waterproofing and protection against brackish water.
• Foundation protection.
• Waterproof coating for roofs.
• Backing for marble and granite to prevent water ingress and surface staining.
• Protection against carbonation and chloride attack on concrete surfaces.
• Use on pedestrian walkways in marine areas.
• Waterproofing wet areas beneath tiling.
• Waterproofing and protection for spray polyurethane foam roof insulation.

ADVANTAGES

• Waterproof
• Excellent adhesion, bonds to both porous and non-porous surfaces
• Flexible
• Non-toxic and suitable for contact with potable water
• Suitable for light pedestrian traffic
• Breathable, allowing the substrate to breathe while repelling water
• High resistance to chloride ion diffusion
• Unlike conventional coatings that require a 7-28 day cure for concrete, MasterSeal 550 can be applied to concrete just 24 hours after pouring, providing immediate protection
• White color offers a high solar reflectivity index (SRI), helping to prevent the heat island effect on roofs

PACKAGING AND COLORS

MasterSeal 550 is available in a 20 kg double pack.
It is offered in three standard colors: J-Light Grey and K-White.

APPLICATION GUIDELINES

Surface preparation:
As with all coating systems, surface preparation is
of prime importance. Remove all grease, oil, dust,
residual curing compound, mould release agent or
other contaminant that could impair adhesion.
Laitance should preferably be removed by light
sweep blasting or hydro-jetting. Mechanical wire
brushing may be appropriate for small areas.
Spalled concrete should be cut back to sound
concrete and made good with a suitable
cementitious repair mortar such as
MasterEmaco S 488. Conventional concrete
curing compounds should be removed before
application. The exception to this is when
MasterKure 181 has been used. Roofing tiles
should be firmly bedded and grouted before
application.

Chloride Ion diffusivity
MasterSeal 550 provides an effective barrier to
waterborne salts such as chlorides and sulphates.
*lndependent assessment has shown that even
after 12 months constant immersion the chloride
ion diffusion co-efficient could not be measured for
MasterSeal 550.

Chemical resistance
MasterSeal 550 has outstanding wear and
weather resistance and good resistance to sodium
hydroxide, calcium chloride, de-icing salts.
MasterSeal 550 coated surfaces exhibit good
resistance to mild acids.

Anti carbonation coating
MasterSeal 550 is an extremely effective barrier to
atmospheric acidic gases which cause carbonation
in concrete structures. MasterSeal 550 at an
applied rate of 1.8 kg/m² gives an equivalent air
layer thickness for carbon dioxide diffusion (R) of
92 m. The accepted minimum value for R is 50 m.
Testing to confirm this was carried out
independently by Taywood Engineering 2005. A
report is available on request.

MIXING

MasterSeal 550 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 drill fitted with a suitable
paddle. MIX AND USE. Do not mix more material
than can be used in one hour.
NOTE: Although MasterSeal 550 is supplied in
premeasured packs, part packs can be used by
mixing 2 volumes of powder to 1 volume of liquid.
Mix thoroughly and keep mixed during application.
DO NOT RE-TEMPER WITH WATER.

PLACING / APPLICATION

Do not apply to dry concrete
Saturate concrete surfaces with clean water whilst
still visibly damp, but free of standing water, apply,
using a short, stiff bristle brush or roller. Trowel
application can be undertaken as necessary. For
heavy 6-10 mm 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 1 mm thick.
Spray application is recommended for large areas,
details of suitable equipment can be provided by
BASF’s Technical Service Dept.
Notes
Where subsequent tiling works are to be carried
out on vertical surfaces, contact the local BASF
representative for advice.

COVERAGE / YIELD:

1.8 kg / m² at 1 mm thickness.

STORAGE AND SHELF LIFE:

Part A (powder): Shelf life is 12 months from date
of manufacturing in unopened original bags.
Product must be kept out of direct sunlight, in a
dry, cool place, stored clear of the ground on
pallets. Avoid excessive compaction.
Part B (liquid): Shelf life is 9 months from date of
manufacturing in unopened original containers.
Product must be kept out of direct sunlight and in a
dry, cool, preferably air-conditioned warehouse
below 35ºC temperature. Store clear of the ground
on pallets. Do not stack pallets.

HEALTH AND SAFETY:

As with all chemical products, care should be
taken during use and storage to avoid contact with
eyes, mouth, skin and foodstuffs. Treat splashes to
eyes and skin immediately. If accidentally ingested,
seek immediate medical attention.

QUALITY AND CARE:

All products originating from BASF’s Dubai, UAE
facility are manufactured under a management
system independently certified to conform to the
requirements of the quality, environmental and
occupational health & safety standards ISO 9001,
ISO 14001 and ISO 45001.

PRODUCT DATA SHEET (Download)