Mariseal 250 FLASH
  • Mariseal 250 FLASH

highly permanent elastic, cold applied and cold curing, one component polyurethane membrane used for long- lasting waterproofing

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Mariseal 250 FLASH


MARISEAL®  250 FLASH is a premium, liquid-applied, semi- thixotropic, highly permanent elastic, cold applied and cold curing, one component polyurethane membrane used for long- lasting waterproofing.The MARISEAL® 250 FLASH 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).
  • Semi-thixotropic (for use on sloped surfaces)
  • 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. Resistant to detergents, oils, seawater and domestic chemicals. The waterproofed surface can be used for domestic and public pedestrian and vehicular traffic.
  • 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.


Technical Data




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)


Resistance to mechanical damage by dynamic impression

High Resistance (class:P3)


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


Hardness (Shore A Scale)


ASTM D 2240 (15”)

Resistance to Root Penetration


UNE 53420

Solar Reflectance (SR)


ASTM E903-96

Solar Emittance (ε)


ASTM E408-71

Thermal Resistance (80oC for 100 days)

Passed – No significant changes


UV accelerated ageing, in the presence of moisture

Passed – No significant changes


Resistance after water aging



Hydrolysis (5% KOH, 7days cycle)

No significant elastomeric change

Inhouse Lab

Construction Material Fire class


DIN 4102-1

Resistance to Flying Sparks and Radiating Heat


DIN 4102-7

Service Temperature

-30oC to +90oC

Inhouse Lab

Shock Temperature (20min)


Inhouse Lab

Rain Stability Time

4 hours


Conditions: 20oC, 50% RH

Light Pedestrian Traffic Time

12 hours

Final Curing time

7 days

Ch e m i c a l P r o p e r t i e s

Good resistance against acidic and alkali solutions (5%), detergents,

seawater and oils.


Characteristic :Application:

• 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.



MARISEAL® 250 FLASH is supplied in 25 kg, 15 kg, 6 kg, 1kg metal pails and 250 FLASH 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.

Download : Download: English Document

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.


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 FLASH, 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 FLASH, 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.
  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 FLASH, 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 FLASH. 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.



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.

tion (cont.)

Waterproofing membrane

Stir well before using. Poor the MARISEAL®  250 FLASH 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 FLASH.

For demanding applications, apply a third layer of the MARISEAL®250 FLASH.

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 FLASH a correct cut piece of MARISEAL® Fabric, press it to soak, and saturate again with enough MARISEAL®    250 FLASH. For detailed application instructions with the MARISEAL®  Fabric, contact our overlapping.R+D department.

ATTENTION: Do not apply the MARISEAL® 250 FLASH over 0.6 mm thickness (dry film) per layer. For best results, the temperature

Low temperatures retard cure while high temperature speed up curing. High humidity may affect the final finish.



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 FLASH. 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.