MRT 60

Liquid applied polyurethane waterproofing membrane

Numastec MRT 60 is fast-curing, liquid-applied, highly permanent elastic, cold applied and cold curing, bitumen extended, two component polyurethane membrane used for long-lasting waterproofing. Solvent based.

Numastec MRT 60 is based on pure elastomeric hydrophobic polyurethane resins, and is extended with chemically polymerized virgin bitumen, which results in excellent mechanical, chemical, thermal and natural element resistance properties.

Cures by reaction (cross linking) of the two components.

ADVANTAGES:

  • Simple application.
  • When applied forms seamless membrane without joints.
  • Resistant to water.
  • Resistant to frost.
  • Fast curing.
  • Thick, bubble-free membrane possible.
  • Provides excellent crack-bridging properties.
  • Good water vapour blocking properties.
  • Provides excellent thermal resistance, it never turns soft.
  • Maintains its mechanical properties over a temperature span of -30 °С to +90 °С.
  • Provides excellent adhesion to almost any type of surface.
  • The waterproofed surface can be walked on.
  • 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.
  • Components easy mixing ratio, 1:1 by volume
  • Waterproofing of Foundations
  • Waterproofing of Retaining Walls
  • Under-tile Waterproofing in Bathrooms, Terraces, Roofs,etc
  • Waterproofing of Roofs with inverted insulation
  • Waterproofing of Asphalt- and Bitumen-felts, EDPM membranes, etc
  • Underground pipes
  • Also used as a joint sealant for horizontal low-movement joints and control joints

MAINTENANCE

Shelf life: 6 months

Storage: Do not store in direct sunlight or near high heat sources.

Storage temperature: Between 4.5 °С and 30 °С

Remarks: During long-term storage it is recommended to shake or to turn the pails upside down every 3 months in order to retard complete separation of solvents and solids.

Requires at least two hours of full sun drying time before it can withstand exposure to heavy dew or light rain.

Because this product is water based. application shall not begin during inclement weather; when precipitation appears imminent; when freezing conditions are imminent; or when freezing may occur within 24 hours.

QUICK FACTS

Elongation at Break > 2400%
Tensile Strength > 7 Nlmm
E-Modulus -1,0 Nlmm
Tear Resistance 20 Nlmm
Puncture Resistance 290 N
Resistance to Hydrostatic pressure No Leak @ 3 bar (3 m water column)
Adhesion to concrete 1,1 N/mm
Hardness (Shore A Scale) 35
Thermal Resistance (80°С for 100 days) Passed – No significant changes
Hydrolysis (5% KOH, 7 days cycle) No significant elastomeric change
Service temperature -30°С to +90°С
Max. Temperature short time (15 min shock) 200°С
Pot-life 30-35 min
Tack Free time 2-4 hours
Light pedestrian Traffic Time 18-24 hours
Final Curing time 7 days
Chemical properties Good resistance against acidic and alkali solutions (5%), detergents, seawater and oil

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!

Mixing

Stir Numastec MRT 60 Component A well before using. Equal quantities (by volume) of Numastec MRT 60 Component A and Component B should be mixed in a separate container, by low speed mechanical stirrer, for about 3-5 min. Apply mixed quantities immediately.

ATTENTION: The mixing of the components has to be effected very thoroughly, especially on the walls and bottom of the pail until the mixture becomes fully homogeneous.

Waterproofing membrane

Apply the Numastec MRT 60 A+B mixture onto the surface by roller, brush or teeth trowel, until all surface is covered. After 6-24 hours (not later than 72 hours) apply another layer of the Numastec MRT 60. For demanding applications, apply a third layer of the Numastec MRT 60.

If the Numastec MRT 60 is to be covered with ceramic tiles, fully saturate with oven-dry silica sand (corn-size 0,4-0,8mm) the last layer while still wet. This saturation will create an adhesion bridge to the tile adhesive that will follow.

For best results, the temperature during application and cure should be between 5 °С and 35 °С. Low temperatures retard cure while high temperature speed up curing. High humidity may affect the final finish.