Cemimax Max Seal PU

Cemimax Max Seal PU

High Performance Polyurethane Waterproofing Membrane

Max Seal PU is a single component, ready to use, highly elastic, cold applied polyurethane waterproofing which cures into a membrane with excellent performance. It is evenly coated on the construction base with scraper, roller and other tools. It can react with moisture and solidify into a flexible, strong and durable waterproof coating.

Product Data Sheet Safety Data Sheet

Products Features and Benefits

  • High strength, high elongation and good elasticity;
  • The coating is dense without bubbles or pinholes;
  • Environment friendly
  • Liquid, cold construction, flexible and convenient application
  • Chemical reaction film, water resistance, corrosion resistance, mildew resistance, cold resistance and impermeable.

Technical Data

Max seal PU single component waterproof coating

  • Product type: Polyurethane
  • Construction application scope: Permanent waterproof for roof, wall, basement, pool and toilet
  • Product appearance: Uniform viscous liquid
  • Product viscosity(23 ℃): 4000-8000mPa·S
  • Construction time: 60 min
  • Surface drying time (23 ℃): 4000-8000mPa·S
  • Solid content: > 85%
  • Odor: no pungent odor
  • Construction conditions: 1. Avoid construction below 5 ℃; 2. There is no open water on the construction base; 3. The base course shall be cleaned in advance to remove laitance and dust; 4. The waterproof layer shall not be constructed until the concrete construction is completed for more than 2-3 weeks.

Product Performance

  • Comparative control tensile strength: 2.8MPa
  • Elongation at break: 600%
  • Tear strength: 17N / mm
  • Bonding strength: ≥ 1MPa
  • Water absorption: ≤ 5%
  • Low temperature bending: - 35℃, no crack
  • Impermeability: 0.3MPa, 120min, impermeable
  • Strength retention rate after acid treatment: 80% - 150%
  • Elongation after acid treatment: 600%
  • Strength retention rate after alkali treatment: 80% - 150%
  • Strength retention rate after alkali treatment: 600%
  • Strength retention rate after heat treatment: 80% - 150%
  • Elongation after heat treatment: 800%

  • Tools required for construction: scraper, roller, trowel

  • Construction protective equipmen: helmet, gloves, goggles and mask

  • Film thickness is required to be: 1.5mm ± 0.2mm

  • Construction consumption: about 2.4kg/m2

Limitations and Important Notes


  • There should be no open water on the foundation surface of the project, otherwise, the construction should be carried out 24 hours after the drainage;
  • Construction should be carried out at a temperature above 5 ℃, the construction site should be well ventilated, and fire-fighting equipment should be placed;
  • After opening the barrel, it should be used up as soon as possible, and the time should not exceed 60 minutes; do not directly expose to the air for a long time to prevent skinning. After opening the cover, the unused materials shall be closed immediately, and the remaining materials shall be used up as soon as possible;
  • It is forbidden to walk on the waterproof layer before the coating is dry, and pay attention to protect the construction site.

Suitable Substrate Conditions

  • The product is stored in a clean, dry and closed iron barrel with a volume of 20kg / barrel and 10kg / barrel;
  • Transport according to the requirements of dangerous goods, prevent rain, exposure, extrusion and collision, and ensure the package is intact;
  • The product shall be stored in a ventilated, dry and cool place to prevent direct sunlight and rain. The storage temperature shall not be higher than 40℃;
  • Under normal storage conditions, the shelf life is 6 months.


  • Substrate preparation: The substrate shall be flat, clean, firm and solid, free of open water, sharp corners and obvious wet spots, and the node arc treatment shall be done well to ensure that the construction tools must be dry and clean.
  • Layer for detail node: For internal and external corners, pipe roots, deformation joints and other foundation details, additional waterproof layer construction shall be carried out first, and 2-4 additional coats (thickness not less than 1mm) can be applied.
  • Large area waterproof coating application: The mixture shall be evenly coated with rubber or plastic scraper with the same thickness. Generally about 1.5mm, coating in 2-3 times, and the later coating shall be carried out in different directions after the previous coating solidifies into film.
  • Edge treatment: Add coating for sealing.
  • Protective isolation layer: The protective isolation layer shall be constructed on the surface of the coating waterproof layer according to the design requirements.