Top Market - Waterproof Membranes


Polyurethane Resins (Waterproofing Materials)

For any environment that affects human life, we work with you and for you to prepare a bright future for generations to come by offering innovative, environmentally friendly, and safe products manufactured with utmost attention and care by Purin working relentlessly.

The more important water is for our life, the more dangerous it is. We must provide all the necessary conditions for a sustainable life by using science and technology. On the one hand, we should pay attention to the careful and necessary use of water, and on the other hand, we should prevent its harm. The life of our buildings, where we and our loved ones are safest, shortens as a result of contact with water. Concrete structures will allow water to pass into the interior areas. The irons that serve as skeletons in concrete structures rust and lose performance as a result of water contact. This makes it difficult for our buildings to survive. Therefore, waterproofing the buildings protects the lives of us and our loved ones.

When waterproofing materials are summarized, they are used in the following areas;

• Foundations, walls in contact with the soil
• Exterior walls below the level where water can accumulate outside the structure or splash water
• Terraces and pitched roofs
• Balconies
• Wet areas such as bathrooms and WCs
• Swimming and ornamental pools
• Drinking and utility water tanks
• Artificial lakes and ponds
• Channels and streams made of concrete
• Cut-and-cover and carved tunnels
• Bridges and viaducts Waterproofing

Waterproofing should be done in every area from the foundation to the roof. The material to be selected for waterproofing must first of all prevent the passage of water. In addition, some mechanical properties are required. Many materials, some organic or inorganic, have been used to date. Popular ones can be summarized as cement-based inorganics, acrylic resins, bitumen resins, bitumen-polyurethane resins, polyurethane resins.

If the waterproofing is done from the direction the water comes from, it is called positive-side waterproofing, while if it is done from the opposite direction of the water, it is called negative-side waterproofing. Positive-side materials are smear-based materials. Negative-side materials are injection resins.

Polyurethane systems represent a special group that adds value to the present and the future as the most performance products for waterproofing. Let's explain the current and future-based product designs of waterproofing products that can be made with polyurethane resins with some titles;

One component, Aromatic, Solvent-Based Polyurethane Membranes

Single component reactive polyurethane membranes are a very popular product group due to their very high mechanical strength and good adhesion to the floor. Shelf life poses a serious risk if the necessary recommendations for manufacturers are not followed and a shelf life of 6 months is usually offered.

The product is basically a paint type product obtained as a result of some processing such as filling and coloring of a polymer containing a reactive tip (polyurethane prepolymer resin). It is a material applied to the floor with a roller or a similar equipment.

Curing in polyurethane prepolymer materials; The effect of humidity and temperature in the environment of the reactive groups at the ends occurs with the closing (bonding) of the ends. Ambient temperature and humidity are of great importance for the curing of the product. While the curing rate of the material is very low in cold weather, the curing time is much faster in hot weather in summer. Polyurethane prepolymer materials have NCO groups defined as reactive ends. These reactive groups provide drying, which we call curing, with the humidity in the air due to the following reaction.


As seen in the reaction, the reactive tips react with the humidity in the air. The rate of this reaction depends on the ambient temperature and humidity as mentioned above. It also shows why products made with this type of resin are not applied thickly. If a thick application is made, since the surface of the application absorbs moisture easily, it completes its reaction and causes the surface to close like a film. Since the resin on the substrate of the application cannot reach the moisture on the surface, it will take too long to dry and its adhesion to the floor will be very weak. For these reasons, applications should be made thinly.

Another advantage of the thin application is that the CO2 gas generated as a result of the drying reaction will be easy to rise to the surface and be ejected from the coating. In the thick application, the surface will be closed as it will dry quickly and the CO2 gas that may occur in the lower layers will not be able to escape from the surface and will create air gaps in the coating. These air gaps will directly affect the physical performance of the product, such as elongation and breaking force.

There are auxiliary drying materials that you can use in your systems to eliminate this problem in thick applications, to provide fast drying in thin applications and as a result to guarantee the mechanical performance of the product. Oxazolidines are such auxiliary drying (curing) agents. These materials reach the moisture in the air faster than the reactive NCO groups at the prepolymer ends (more selective) and react with their own moisture.


Due to the reaction with moisture, oxazolidine structures open, revealing NH2 (amine) groups. The resulting amine groups will be easier to react with the reactive ends (NCO groups) in the prepolymer structures. The reaction rate of NCO groups with amines is 400 times faster than with moisture (or polyols). In summary, it dries in the prepolymer as a result of a two-stage reaction.

The most important issue in the production of a single component product is the moisture in the material. This moisture usually comes from filling materials. It should be noted again that it is very important for the producers to be able to remove the moisture from the system. Otherwise, the shelf life of the products can be reduced to 2-3 weeks. Moisture continues the reactions in the material and drying occurs.

Our team provides all the necessary support for all raw material types required for production, supplier company information, optimum price, optimum performance recipes and methods to be applied.

In this section, some of our resins you can use are included in the following table;

ProductTypeStructureNCO (%)Viskosity (23C Cp)Isocyana teExplanation
  PURINATE RM 104       Aromatic       Solvent based       2,5 - 3,5          500 - 600         TDI         1K Aromatic Membrane Resin          
  PURINATE RM 105     Aromatic   Solvent free   3,5 - 4,0 12.000 - 13.000  TDI       1K Aromatic Membrane Resin    
  PURINATE RM 304     Aromatic   Solvent based  2,5 - 3,5  800 - 1200  MDI       1K Aromatic Membrane Resin
  PURINATE RM 305     Aromatic   Solvent free   3,5 - 4,0  60.000 - 80.000  MDI       1K Aromatic Membrane Resin
  PURINATE RM 501     Aliphatic   Solvent based  2,5 - 3,5  800 - 1200 Aliphatic       1K Aliphatic Membrane Resin 

General Product Table (Waterproofing Products)

ProductTypeStructureNCO (%)Viskosity (23C Cp)İzocyanateExplanation
  PURINATE RM 104       Aromatic       Solvent based       2,5 - 3,5          500 - 600         TDI         1K Aromatic Membrane Resin          
  PURINATE RM 105     Aromatic   Solvent free   3,5 - 4,0 12.000 - 13.000  TDI       1K Aromatic Membrane Resin    
  PURINATE RM 304     Aromatic   Solvent based   2,5 - 3,5  800 - 1200  MDI       1K Aromatic Membrane Resin 
  PURINATE RM 305     Aromatic   Solvent free   3,5 - 4,0  60.000 - 80.000  MDI       1K Aromatic Membrane Resin
  PURINATE RM 501     Aromatic   Solvent based   2,5 - 3,5  800 - 1200 Aliphatic       1K Aliphatic Membrane Resin 
  PURINATE RB 102     Aromatic   Solvent free   15,0 - 16,0  1.000 - 1.500 MDI       2K Membrane Hardener 
  PURINATE RB 103     Aromatic   Solvent free  10,0 - 11,0  6.000 - 7.000 MDI       2K Membrane Hardener 
  PURINATE AD 01      Aromatic   Solvent free OH:588 400 Polyol       2K Bitumen-PU Auxiliary Resin  
  PURINATE RP 101     Aromatic   Solvent free 15-16 4.000 - 6.00 MDI       1K Primer Resin (Color:Amber)
  PURINATE RP 102     Aromatic   Solvent free 15-16 1.000 - 2.000 MDI       1K Primer Resin (Color: Light Yellow) 
  PURINCOAT PR 106   Aromatic   Solvent based  - < 100 MDI       1K Polyurethane Primer (Color: Light brown)  
  PURINCOAT PR 107  Aromatic   Solvent based  - < 100 MDI       1K Polyurethane Primer (Color: Colorless)   
  PURINCOAT PR 501  Aliphatic   Solvent based  - < 100 Aliphatic       1K Polyurethane Primer  
  PURINCOAT PR 701  Aliphatic  Water based  - < 100 Aliphatic       1K Water-Based Polyurethane Primer (PCD)*   
  PURINCOAT PR 702  Aliphatic  Water based - < 100 Aliphatic       1K Water Based Polyurethane Primer (PES)**    
  PURINCOAT SM 102  Aliphatic  Solvent based  - < 500 Aliphatic       1K Aliphatic Transparent Coating
  PURINCOAT SM 701  Aliphatic  Water based - 2.500 - 3.500 Aliphatic       1K Aliphatic Transparent Coating (PCD)
  PURINCOAT SM 702  Aliphatic  Water based - 2.500 - 3.500 Aliphatic       1K Aliphatic Transparent Coating (PES)
  PURINAQUA XR 101  Aliphatic  Water based - 1.500 - 2.500 Aliphatic       Auxiliary Resin
  PURINAQUA RM 701  Aliphatic  Water based - < 100 Aliphatic       Polyether based PUD Resin
  PURINAQUA RM 702   Aliphatic  Water based - < 100 Aliphatic       PES based PUD Resin 
  PURINAQUA VS 101  Aliphatic  Water based - 23.000 Aliphatic       Thickener for PUD systems