Nano L Spray Method

The NANO & SPRAY method is a rapid-hardening polyurea spraying method of enhanced flame-retardant performance. The excellent flame-retardant performance of the material and the outstanding mechanical performance of the special mixing device realize the precise mixture in which the material properties and quality are greatly improved by this state-of-the-art contact membrane method.

Certifications and Technologies Owned

  • Polyurea waterproof spray device for better flame-retardant performance
  • The polymer-modified cement manufacturing method & composite waterproofing method by means of polymer-modified cement
  • The composite insulation and waterproof structure by means of lightweight insulation mortar and its method
  • Patent Application (10-2015-0127051)
    The flame-retardant performance polyurea, its polyurea manufacturing method, and the waterproof method by means of polyurea
    Patent Application (10-2015-0048525)
    The room-temperature hardening ceramic coating material, its manufacturing method, and the coating method by means of the room-temperature hardening coating material
    Patent Application (10-2015-0109926)
    The anti-pinhole waterproof material, its manufacturing method, and waterproof method by means of the waterproof material

Method Principle

The NANO L SPRAY method is a polyurea spray method that utilizes polyurea liquid type A and B containing nano-size flame retardants of aluminum hydroxide and antimony oxide. As the liquid elements pass through the upper/lower and left/right routes inside the step style static section, they are mixed evenly and improve the flame-retardant performance. This liquid-applied membrane waterproofing method features the outstanding mechanical properties, chemical-resistance, and durability, and it involves no pinhole or lifting.

Polyurea waterproof spray device for better flame-retardant performance
The grid-shape transferring and mixing device that maximizes the mixing performance

The internal step-type structure of the grid-shape transfer unit goes through the 4-step reverse cycle structure and the 24-step forced cross mixing step in order to secure the mixing rate as high as 99%.

Diagram of Mixing and Discharging Principles

Materials transferred through the grid-shape mixing unit are discharged the air pressure from the air compressor that is connected to the outlet.

Excellence of the Material (flame-retardant performance)

Nano-size flame retardants are added to polyurea liquid A and B, which pass through the upper/lower and left/right routes inside the step-type static section for even mixing and better flame-retardant performance

Excellence of the Material (rapid-hardening)

The special polyurea resin used for the NANO L SPRAY method starts to be dried within 5 seconds from mixing and becomes completely hardened enough for walking on it within 30 seconds. Owing to this ultra-fast hardening property of the special material, this method is quite useful for areas of a high risk of liquid-applied membrane waterproofing defects or construction problems.

Dedicated Equipment
Model Name: DNS –ST 2000
DNS –ST 1000 DNS –ST 2000
Supply voltage 220V single phase, 60hz 220V single phase, 60hz
Capacity 100 (ℓ/h) 300 (ℓ/h)
Material sus304 sus304
Pressure 300 ~ 700 psi 300 ~ 2000 psi
Weight 45kg 150kg
Viscosity 0 ~ 50,000 cps 0 ~ 50,000 cps

Major Features

Outstanding flame-retardant performance

Standards for ship interior parts

* The gas measurements in each condition shall not exceed the upper limits below

Gas Type CO HCl HBr HCN HF NOx SO2
Standard (ppm) 1450 600 600 140 600 350 120
Test Name Test Condition Test Result (ppm) Test Method
Toxicity test 25kw/m2 without ignition flames 619.9 N.D 6.6 N.D N.D N.D N.D IMO.Res. MSC61 (67) FTP Code Part2 659:1994 Part 2
25kw/m2 with ignition flames 594.4 N.D 5.8 N.D N.D N.D N.D
50kw/m2 without ignition flames 919.5 N.D 14.9 N.D N.D N.D N.D

Standards for finishing material flame-retardant performance and fire spreading prevention (Ministry of Land, Transportation, and Maritime Affairs, Notice No. 2012-624)

Test Item Related Criteria Test Result Performance Standard
Heat Release Rate KSF ISO 5660-1:2008 Total Heat Release / 5 min. 7MJ/m2 8MJ/m2 or less
Max. Heat Release / 5 min. 190kw/m2 200kw/m2 or less
Gas Harmfulness KSF 2271:2006 Average Behavior Suspending Time of Rats 11 min. 9 min. or more
Outstanding Crack Resistance
  • Fatigue resistance test
  • Structure behavior response performance
  • Crack resistance performance

The high expansibility prevents simultaneous fracture of the waterproof layer upon cracks on the base.

Outstanding Surface Durability
  • Shock resistance

    No hole was made at three places to which shock was
    applied from a 1.5m high place

  • Digging resistance

    No hole was made at three places to which
    250 N load was applied.

Flowing resistance

A specimen thoroughly coated was fixed at 90° for 24 hours and examined to find wrinkles on it, and no flowing or wrinkle was observed at all.

Excellent Constructability
  • The hydraulic cylinder method maximizes daily constructability.
    (Max. construction capacity per hour: 150m2 / h)
  • Lightweight for more convenient construction; high pressure for high space efficiency
    (weight (DNS-ST 2000): 150kg; max. vertical distance: 150M)
Characteristics and Advantages


  • Eco-friendly solvent-free (100% solid) type applicable to soft base materials (ex: asphalt shingle, urethane foam, insulation, exposed sheet, etc.)
  • No volatile organic compound (VOC) at all

Excellent chemical resistance

  • The unique characteristics of the material include outstanding chemical resistance, which is quite useful for water/waste water treatment facilities
  • Applicable to steel tube coating materials and chemical resistance coating facilities


  • It is possible to take the following step of construction only 30 minutes after the spraying work -> Excellent construction continuity.
  • Owing to the ultra-fast hardening characteristic, there is no flowing on a vertical surface, and thus uniform thickness is secured in a construction work. Related defects also can be prevented.

Construction Procedures

Construction Examples

Various construction rooftops

Wall waterproofing on outside

Various construction outer wall finishing

Playground track

Public work structures

School balcony

School cafeteria floor

Rooftop trench

Water treatment facility

Asphalt shingle