Himtrust SKN-20 G3

Spraying of a rigid polyurethane foam with a density of 20 kg/m3 and a flammability class of G3 for internal heat and noise insulation, for floors, attics, balconies and under drywall insulations. It is not intended for mechanical action.


Blowing Agent: Water. Before making your choice, please see the Differences Between Water and Freon systems.

Flammability class – G3 (normal combustibility).

Ambient temperature during spraying is from +10 to 40°C.


Component A: Himtrust KAN-20 G3 (tare: 220 kg, 50 kg).

Component B: (container: 250 kg, 50 kg)


Product description

Polyol (Component A) is a transparent liquid from yellow to brown colors.

Isocyanate component (component B) is a polymer of diphenylmethane diisocyanate brands: "Lupranat M 20 S", "Millionate MR-200", "Wannate PM-200", "Desmodur VKS 20 F", "Suprasec 5005", "Сosmonate M-200", "Ongronat 2100" - not stratifying transparent brown liquid.

Physical and mechanical parameters

Parameter Value Testing method
Density (in the core) 22-27 kg/m3 GOST 17177-94
Compressive strength 0.1-0.2 N/mm2 GOST 17177-94
Bending strength 0.7-0.8 N/mm2 GOST 17177-94
Closed Cells content 60-70 % ISO 4590
Vapor permeability coefficient 0.05 Mg/(m*h*PA) GOST 25898-2012
Water absorption by volume in 7 days no more than 5% GOST 20869 -75
Thermal conductivity 0.032-0.035 W/(m*S) GOST  7076-99
Actual density 22-25 kg/m3 half-closed cell

Preparation and Processing

  1. To ensure reactivity and viscosity of the components, it is necessary to bring temperature of the A component to 35-40°C, B component to 45-55°C before processing.
  2. Use paddle stirrer to stir the component A for thirty minutes at 500-1000 rpm.
  3. The isocyanate component (component B) is not required to be mixed if it was stored at a temperature no lower than +15°C. If the isocyanate component was stored at a temperature below +15°C, then slowly heat it to a temperature not higher than +50°C. Then roll the barrel in a horizontal position to a homogeneous state of the component B.
  4. Equipment preparation for polyurethane spraying foam is done accordingly to the equipment manufacturer rules.

Surface requirements:

  1. Application surface should be strong, uniform, clean, dry, free of oils, fats, crumbling, exfoliating residues of the old coating, and dirt.
  2. Epoxy and polymethylmethacrylate surfaces should be pre-treated with abrasive equipment (belt or disc grinders) and cleared from the dust.
  3. Metal surfaces should be decreased and cleaned from rust.
  4. Moisture from the ambient air should not condense on the surface of the insulated structures.
  5. The surface’s temperature must be at least 3°C above the measured dew point. If necessary, the surface should be heated with heaters or other available and safe methods.

Processing rules

For high-pressure machines:

  1. If the ambient temperature is 15-20°C, then the temperature of the flow heaters should be: component A 40-45°C, component B 45-55°C, the temperature of the hoses 35-45°C. Apply 3-5 mm primer layer of PPU, leave for 5 hours, then apply a layer of PPU in one pass no more than 50 mm.
  2. If the ambient temperature is 20-30°C, then the temperature of the flow heaters should be: component A 35-40°C, component B 40-45°C, hoses temperature 30-35°C. Apply a layer of foam in one pass with a thickness of not more than 50 mm.
  3. If the ambient temperature is 30-40°C, then the temperature of the flow heaters should be: component A 30-35°C, component B 40-45°C, turn off the heating of the hoses. Apply a layer of foam in one pass with a thickness of not more than 50 mm.
  4. If the ambient temperature is above 40°C or the surface temperature is above 60°C, we recommend no spraying.

For low pressure machines:

  1. The ambient temperature is 15-20°C, then the barrel with the A component need to be warmed to 40-45°C with the component B to 50-55°C. The hoses with a length of less than 10 m should be insulated. Apply a layer of foam in one pass with a thickness of not more than 80 mm.
  2. If the ambient temperature 20-40°C, then the temperature of the component A should be 30-40°C, component B 40-50°C. Apply a layer of foam in one pass no more than 80 mm.
  3. If the ambient temperature is above 40°C or the surface temperature is above 60°C, we recommend no spraying.

Trial spraying

Before applying PPU, a trial spraying should be performed on a similar to the insulated surface.  During the trial, start time and coming off time are the control variables, which must correspond to the values specified in the technical conditions.

After 10 minutes of spraying, the sample is cut and the structure is visually evaluated. Normal quality foam should have a fine-mesh structure without any visible defects (shells, air bubbles, etc.). If the composition is not foamed, the foam is brittle or elastic, then you should check the components (brand, shelf life), the dosage, the temperature parameters, and pressure of the components. After all re-spray.

Spraying recommendations

Spraying is carried out from a distance of 0.6-1.0 m. When spraying the material, the operator directs the sprayer perpendicularly to the insulated surface. Foam mass to be applied evenly, without pauses in the movement of the sprayer. Insulation of polyurethane foam is applied in 3-4 layers. The optimal thickness of the foamed layer of the composition applied in one pass is not more than 50 mm. The next layer is sprayed 10 minutes after the formation of the previous layer. Do not apply another layer of material, if the previous layer is not foamed. If during spraying rain has started, then the work should be stopped and to be continued after the previous layer fully dried.

If a large area required to be sprayed, then the work of spraying all layers has to be completed in one day. In case of a break in the spraying work, all measures should be taken to achieve a good adhesion to the previous layers (cleaning, drying, etc.).

System consumption per 1 m2

System consumption per 1 m2 at 10°C - 30°C and a layer thickness of 5 cm is 1.1-1.35 kg. Output with a set of 16-18 m3.

Health effects and precautions

When spraying, use a gas mask BKF or B, goggles with side pads, impervious gloves made of synthetic rubber, special clothing, and shoes.

Storage recommendations

The shelf life of the polyol component is 12 months at 20°C and without opening the barrels.

Problems and solutions

To learn more about specific problems and solutions, please refer to the article Instructions for Solving Problems in the Spraying of Polyurethane Foam.

Rights

Production of polyurethane materials and foamed polymeric materials is protected by patents and patent applications. This publication does not grant the right to carry out patented technological processes. The information and recommendations contained in this publication fully reflect Himtrust’s knowledge of the product to date. All the information is accurate to the best of our knowledge at the time of the publication.  Nothing in this publication should be construed as a warranty. In all circumstances, it is the user’s responsibility to determine the applicability of such information or the product itself to the user's specific purpose.

Differences between freon and water systems

Comparative Characteristics Blowing Agent
Freon Water
Cost 10-15% more expensive than domestic water systems and 40-50% more expensive than imported systems. 10-15% cheaper than freon systems of domestic components and 40-50% cheaper than imported systems.
Processing conditions Summer systems: spraying at temperatures from +10°C to +30°C. processing Conditions are limited at high temperatures.
Winter systems – spraying at temperatures from -10°C to +15°C. Processing conditions are limited at high temperatures. When processing winter freon systems at low temperatures from +10 to -10°C, it is necessary to apply a primer layer. The next layer of polyurethane primer is applied after at least 5 hours.
Spraying can be done at temperatures from +10°C to +40°C. There are no winter systems for spraying foam at low temperatures.
Storage Freon is more sensitive to temperature changes, partially flies away during its storage. When storing barrels on the street, in a hot weather, the barrels can swell. Temperature changes are not critical for storage.
Adhesion Adhesion to the base and between layers is better than in water systems Adhesion to the base and between the layers is worse than that of freon systems.
Thermal conductivity 10-15% lower than in water systems, so the foam thickness can be made 10-15% less 10-15% higher than in freon systems, therefore the insulation thickness should be made by 10-15% more.
Density There are no freon systems for spraying foam with density lower than 25 kg/m3 There are components for spraying with density of 8-20 kg/m3
Actual density for systems with a density of 30 kg/m3 he actual density of the finished foam 33-36 kg/m3 or 13-14 cubes with 1 set with a mass of 470 kg and with a thickness of 5 cm for components with a density of 30 kg/m3 at the ambient temperature of 25-30° C and applied two layers of 2,5 cm on the high-pressure vessel. The actual density of the finished foam 40-43 kg/m3, or 10.9 11.75 cubes with 1 set with a mass of 470 kg and with a thickness of 5 cm for components with a density of 30 kg/m3 at the ambient temperature of 25-30° C and applied two layers of 2,5 cm on the high-pressure vessel.

Other products

Himtrust SKN-10 G3

Component A: Himtrust KAN-10 G3 (tare: 220 kg, 50 kg). Component B: (container: 250 kg, 50 kg)

Foaming Agent: Water
Foaming density: 10-15
The output of foam per set: 12-16

Himtrust SKN-30 G2

Rigid polyurethane foam spraying with density of 30 kg/m3 and combustibility class G2 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 30-35
The output of foam per set: 12-13
Consumption per 1m2 at 50 mm thickness: 2,0-2,25

Himtrust SKN-30 G3

Rigid polyurethane foam spraying with density of 30 kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 30-35
The output of foam per set: 12-13
Consumption per 1m2 at 50 mm thickness: 1,8-2,5

Himtrust SKN-30 G4

Rigid polyurethane foam spraying with density of 30 kg/m3 and combustibility class G4 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 30-35
The output of foam per set: 12-13
Consumption per 1m2 at 50 mm thickness: 1,8-2,5

Himtrust SKN 30/141 G3

Rigid polyurethane foam spraying with density of 30 kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Freon
Foaming density: 25-30
The output of foam per set: 12-14
Consumption per 1m2 at 50 mm thickness: 1,75-2,25

Himtrust SKN-30/141 G3 (winter)

Rigid polyurethane foam spraying with density of 30 kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Freon
Foaming density: 30-35
The output of foam per set: 12-14
Consumption per 1m2 at 50 mm thickness: 1,8-2,25

Himtrust SKN-40 G1

Rigid polyurethane foam spraying with density of 40 kg/m3 and combustibility class G1 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 38-43
The output of foam per set: 9-10
Consumption per 1m2 at 50 mm thickness: 2,5-2,75

Himtrust SKN-40 G2

Rigid polyurethane foam spraying with density of 40 kg/m3 and combustibility class G2 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 38-43
The output of foam per set: 9-10
Consumption per 1m2 at 50 mm thickness: 2-2,25

Himtrust SKN-40 G3

Rigid polyurethane foam spraying with density of 40 kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 38-43
The output of foam per set: 9-10
Consumption per 1m2 at 50 mm thickness: 2,25-2,5

Himtrust SKN-40/141 G3

Rigid polyurethane foam spraying with density of 40 kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Freon
Foaming density: 38-42
The output of foam per set: 9-10
Consumption per 1m2 at 50 mm thickness: 2,25-2,5

Himtrust SKN-40/141 G3(winter)

Rigid polyurethane foam spraying with density of 40 kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Freon
Foaming density: 38-43
The output of foam per set: 9-10
Consumption per 1m2 at 50 mm thickness: 2,25-2,5

Himtrust SKN-60 G1

Rigid polyurethane foam spraying with density of 60kg/m3 and combustibility class G1 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 50-60
Consumption per 1m2 at 50 mm thickness: 3,0-3,5

Himtrust SKN-60 G2

Rigid polyurethane foam spraying with density of 60kg/m3 and combustibility class G2 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 50-60
Consumption per 1m2 at 50 mm thickness: 3,0-3,5

Himtrust SKN-60 G3

Rigid polyurethane foam spraying with density of 60kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 50-60
Consumption per 1m2 at 50 mm thickness: 3,0-3,5

Himtrust SKN-60/141 G3

Rigid polyurethane foam spraying with density of 60kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Freon
Foaming density: 50-60
The output of foam per set: 7-8
Consumption per 1m2 at 50 mm thickness: 3,0-3,5

Himtrust SKN-100 G3

Rigid polyurethane foam spraying with density of 100kg/m3 and combustibility class G3 for seamless thermal insulation.

Foaming Agent: Water
Foaming density: 90-100
Consumption per 1m2 at 50 mm thickness: 5,0-5,5

Himtrust SKN-100/141 G3

Rigid polyurethane foam spraying with density of 100kg/m3 and combustibility class G3 for seamless thermal insulation.

Start time, (sec): 2-5
Foaming density: 90-100
Consumption per 1m2 at 50 mm thickness: 5,0-5,5

Himtrust SKN-80/141G3

Rigid polyurethane foam spraying with density of 80kg/m3 and combustibility class G3 for seamless thermal insulation.

Start time, (sec): 2-5
Foaming density: 70-80
Consumption per 1m2 at 50 mm thickness: 4.0-4.5
Himtrust SKN-60/141G3

Himtrust SKN-60/141G3

Rigid polyurethane foam spraying with density of 60kg/m3 and combustibility class G3 for seamless thermal insulation.

Start time, (sec): 2-5
Foaming density: 50-60
The output of foam per set: 7-8
Consumption per 1m2 at 50 mm thickness: 3,0-3,5