MARISEAL® 250 TECHNICAL DATA SHEET
Date: 01.06.2011 – Version 10
Liquid-applied polyurethane waterproofing membrane
Product description Advantages
MARISEAL® 250 is a premium, liquid-applied, highly
permanent elastic, cold applied and cold curing, one
component polyurethane membrane used for long-lasting
waterproofing.
The MARISEAL® 250 is based on pure elastomeric
hydrophobic polyurethane resins, which result in excellent
mechanical, chemical, thermal, UV and natural element
resistance properties.
Cures by reaction with ground and air moisture.
• Simple application (roller or airless spray).
• When applied forms seamless membrane without joints.
• Resistant to water.
• Resistant to frost.
• Resistant to root penetration, so it can be used in green roofs.
• Crack-bridging up to 2mm, even at -10oC.
• Provides water vapor permeability, so the surface can breathe.
• Provides excellent thermal resistance, it never turns soft.
• Provides excellent weather and UV resistance.
• Waterproofs old bitumen-, asphalt felts by covering them,
without the need to remove them prior to application.
• Provides high sun reflectivity, contributing to thermoinsulation.
• Maintains its mechanical properties over a temperature span of
-40oC to +90oC.
• Provides excellent adhesion to almost any type of surface.
• The waterproofed surface can be used for domestic and public
pedestrian and vehicular traffic.
• Resistant to detergents, oils, seawater and domestic chemicals.
• Even if the membrane gets mechanically damaged, it can be
easily repaired locally within minutes.
• Does not need the use of open flames (torch) during application.
• Over 15 years of positive feedback worldwide.
Uses Consumption
1,4 – 2,5 kg/m2 applied in two or three layers.
This coverage is based on application by roller onto a smooth
surface in optimum conditions. Factors like surface porosity,
temperature and application method can alter consumption.
Colors
• Waterproofing of Roofs
• Waterproofing of Balconies, Terraces and Verandas
• Waterproofing of Wet Areas (under-tile) in Bathrooms,
Kitchens, Balconies, Auxiliary Rooms, etc
• Waterproofing of Pedestrian and Vehicular traffic Decks
• Waterproofing of Green Roofs, Flowerbeds, Planter Boxes
• Waterproofing of old Bitumen felts, Asphalt felts, EPDM and
PVC membranes and old Acrylic coatings.
• Protection of Polyurethane Foam Insulation
• Waterproofing and protection of Concrete constructions like
Bridge-Decks, Tunnels, Stadium Stands, Car Parks, etc.
The MARISEAL® 250 is supplied in white and light grey.
Other colors may be supplied on demand.
Certifications
European Technical Approval: ETA05/0197 DIBt
Levels of use categories according to ETAG005,
for liquid-applied Polyurethane waterproofing
kits:
Working life: W2 10 Years
Climate Zone: M and S All
Imposed loads: P1 to P3 High
Roof slopes: S1 to S4 <5o to >30o
Lowest surface temperature: TL3 -30oC
Highest surface temperature: TH4 +90oC
Reaction to fire: Class E EU Norm
Resistance to wind loads ≥ 50 kPa EU Norm
The MARISEAL® 250 was tested by the German state testing
institute for construction materials MPA-Braunschweig
according the European Union Directive for liquid-applied roof
waterproofing kits ETAG 005 and was found conforming.
The MARISEAL® 250 was certified by the German state
Institute for construction techniques DIBt–Berlin with the
European Technical Approval (ETA) and with the CE-mark and
certification according to the EOTA (European Organization of
Technical Approval).
The MARISEAL® 250 was also tested and approved by various
laboratories in different countries around the world.
Technical Data *
PROPERTY RESULTS TEST METHOD
Elongation at Break > 800 % ASTM D 412 / DIN 52455
Tensile Strength > 4 N/ mm 2 ASTM D 412 / DIN 52455
Water Vapor Permeability > 25 gr/m2/day ISO 9932:91
Resistance to mechanical damage by static impression High Resistance (class:P3) EOTA TR-007
Resistance to mechanical damage by dynamic impression High Resistance (class:P3) EOTA TR-006
Resistance to Water Pressure No Leak (1m water column, 24h) DIN EN 1928
Adhesion to concrete >2,0 N/mm 2 (concrete surface failure) ASTM D 903
Crack Bridging Capability up to 2 mm crack EOTA TR-008
Hardness (Shore A Scale) 65 ASTM D 2240 (15”)
Resistance to Root Penetration Resistant UNE 53420
Solar Reflectance (SR) 0.87 ASTM E903-96
Solar Emittance (ε) 0.89 ASTM E408-71
Thermal Resistance (80oC for 100 days) Passed - No significant changes EOTA TR-011
UV accelerated ageing, in the presence of moisture Passed - No significant changes EOTA TR-010
Resistance after water aging Passed EOTA TR-012
Hydrolysis (5% KOH, 7days cycle) No significant elastomeric change Inhouse Lab
Construction Material Fire class Β2 DIN 4102-1
Resistance to Flying Sparks and Radiating Heat Passed DIN 4102-7
Service Temperature -30oC to +90oC Inhouse Lab
Shock Temperature (20min) 200oC Inhouse Lab
Rain Stability Time 4 hours
Light Pedestrian Traffic Time 12 hours
Final Curing time 7 days
Conditions: 20oC, 50% RH
Chemical Proper t ies Good resistance against acidic and alkali solutions (5%), detergents,
seawater and oils.
Application
Surface Preparation
Careful surface preparation is essential for optimum finish and durability.
The surface needs to be clean, dry and sound, free of any contamination, which may harmfully affect the adhesion of the membrane.
Maximum moisture content should not exceed 5%. Substrate compressive strength should be at least 25MPa, cohesive bond
strength at least 1.5MPa. New concrete structures need to dry for at least 28 days. Old, loose coatings, dirt, fats, oils, organic
substances and dust need to be removed by a grinding machine. Possible surface irregularities need to be smoothened. Any loose
surface pieces and grinding dust need to be thoroughly removed.
WARNING: Do not wash surface with water!
Repair of cracks and joints:
The careful sealing of existing cracks and joints before the application is extremely important for long lasting waterproofing results.
• Clean concrete cracks and hairline cracks, of dust, residue or other contamination. Prime locally with the MARISEAL® 710
Primer and allow 2-3 hours to dry. Fill all prepared cracks with MARIFLEX® PU 30 sealant. Then apply a layer of MARISEAL®
250, 200mm wide centered over all cracks and while wet, cover with a correct cut stripe of the MARISEAL® Fabric. Press it to
soak. Then saturate the MARISEAL® Fabric with enough MARISEAL® 250, until it is fully covered. Allow 12 hours to cure.
• Clean concrete expansion joints and control joints of dust, residue or other contamination. Widen and deepen joints (cut open) if
necessary. The prepared movement joint should have a depth of 10-15 mm. The width:depth ratio of the movement joint should
be at a rate of approx. 2:1.
Apply some MARIFLEX® PU 30 Joint-Sealant on the bottom of the joint only. Then with a brush, apply a stripe layer of
MARISEAL® 250, 200mm wide centered over and inside the joint. Place the MARISEAL® Fabric over the wet coating and with a
suitable tool, press it deep inside the joint, until it is soaked and the joint is fully covered from the inside. Then fully saturate the
fabric with enough MARISEAL® 250. Then place a polyethylene cord of the correct dimensions inside the joint and press it deep
inside onto the saturated fabric. Fill the remaining free space of the joint with MARIFLEX® PU 30 sealant. Do not cover. Allow 12-
18 hours to cure.
Priming
Prime absorbent surfaces like concrete, cement screed or wood with MARISEAL® 710 or with MARISEAL® AQUA PRIMER. Prime
surfaces like bitumen-, asphaltfelts with MARISEAL® 730 or with MARISEAL® AQUA PRIMER. Prime non-absorbent surfaces like
metal, ceramic tiles and old coatings with MARISEAL® AQUA PRIMER. Allow the primer to cure according its technical instruction.
Application (cont.)
Waterproofing membrane
Stir well before using. Poor the MARISEAL® 250 onto the primed surface and lay it out by roller or brush, until all surface is covered.
You can use airless spray allowing a considerable saving of manpower.
After 12-18 hours (not later than 48 hours) apply another layer of the MARISEAL®250.
For demanding applications, apply a third layer of the MARISEAL®250.
Reinforce always with the MARISEAL® Fabric at problem areas, like wall-floor connections, 90o angles, chimneys, pipes,
waterspouts (siphon), etc. In order to do that, apply on the still wet MARISEAL® 250 a correct cut piece of MARISEAL® Fabric, press
it to soak, and saturate again with enough MARISEAL® 250. For detailed application instructions with the MARISEAL® Fabric, contact
our R+D department.
RECOMMENDATION: We recommend reinforcement of the entire surface, with the MARISEAL® Fabric. Use 5-10cm stripe
overlapping.
ATTENTION: Do not apply the MARISEAL® 250 over 0.6 mm thickness (dry film) per layer. For best results, the temperature during
application and cure should be between 5oC and 35OC. Low temperatures retard cure while high temperature speed up curing. High
humidity may affect the final finish.
Finishing
If a color stable and chalking-free surface is desired, apply one or two layers of the MARISEAL® 400 Top-Coat over the MARISEAL®
250. The application of the MARISEAL® 400 Top-Coat, is especially required, if a dark final color, is desired. (e.g. red, grey, green)
If a heavy duty, abrasion resistant surface is desired (e.g. Public Pedestrian Deck, Car Parking, etc), apply two layers of the
MARISEAL® 420 Top-Coat.
For the several Top-Coats application procedures, please consult their technical instructions or contact our R+D Department.
WARNING: The MARISEAL® system is slippery when wet. In order to avoid slipperiness during wet days, sprinkle suitable
aggregates onto the still wet coating to create an anti-slip surface. Please contact our R+D Dept. for more details.
Packaging
MARISEAL® 250 is supplied in 25 kg, 15 kg, 6 kg, 1kg metal pails and 250 kg Barrels. Pails should be stored in dry and cool rooms
for up to 9 months. Protect the material against moisture and direct sunlight. Storage temperature: 50-300C. Products should remain
in their original, unopened containers, bearing the manufacturers name, product designation, batch number and application
precaution labels.
Safety measures
MARISEAL® 250 contains isocyanates. See information supplied by the manufacturer. Please study the Safety Data sheet.
PROFESSIONAL USE ONLY
Our technical advice for use, whether verbal, written or in tests, is given in good faith and reflect the current level of knowledge and experience with our products. When using our products, a detailed object-related
and qualified inspection is required in each individual case in order to determine whether the product and /or application technology in question meets the specific requirements and purposes. We are liable only for
our products being free from faults; correct application of our products therefore falls entirely within your scope of liability and responsibility. We will, of course, provide products of consistent quality within the scope
of our General Conditions of Sale and Delivery. Users are responsible for complying with local legislation and for obtaining any required approvals or authorizations. Values in this technical data sheet are given as
examples and may not be regarded as specifications. For product specifications contact our R+D department. The new edition of the technical data sheet supersedes the previous technical information and renders
it invalid. It is therefore necessary that you always have to hand the current code of practice.
* All values represent typical values and are not part of the product specification. In sample preparation the MARISEAL KATALYSATOR was used as an acceleration additive.