Sikagard® M 338
(former MSeal M 338)
Water based, rigid epoxy coating for waterproofing and protection of concrete elements
Sikagard® M 338 is a two component, water borne rigid epoxy coating for waterproofing and protection of concrete elements.
- Water based, environmentally friendly.
- Excellent adhesion to concrete even when damp.
- Does not require an extra primer
- Once hardened it is impermeable to water and carbon dioxide.
- Good water vapour permeability – low risk of blistering.
- Resistant to water, weather and freezing conditions.
- Good chemical resistance.
- High abrasion resistance.
- Easy to apply by roller, brush or with airless gun.
- Easily cleaned and maintained.
Usage
- For both inside and outside use.
- For use on horizontal and vertical surfaces.
- For use on concrete and cementitious mortars.
- Protection of pipes, channels, tanks, sinks etc.
- For use on retaining walls, bridge facings and building structures.
- For early protective coating of fresh precast concrete elements
- For protection of tunnels.
Advantages
- Water based, environmentally friendly.
- Excellent adhesion to concrete even when damp.
- Does not require an extra primer
- Once hardened it is impermeable to water and carbon dioxide.
- Good water vapour permeability – low risk of blistering.
- Resistant to water, weather and freezing conditions.
- Good chemical resistance.
- High abrasion resistance.
- Easy to apply by roller, brush or with airless gun.
- Easily cleaned and maintained.
Packaging
Sikagard® M 338 is available in 25 kg kits consisting of 20.6 kg Part A + 4.4 kg Part in metal pails.
Colour
Part A: grey viscous liquid.
Part B: colourless liquid.
Product Details
APPROVALS / STANDARDS
Test report EN 12873-2:2005 for compliance with RD 140/2003.
Shelf Life
12 months after date of production in unopened original packaging, if stored at below mentioned storage condition.
Storage Conditions
Store Sikagard® M 338 in cool and dry warehouse conditions; protect from freezing. No permanent storage over +30 °C.
Density
Approx. 1.35 kg/l (mixed material)
Shore A Hardness
Approx. 94 | (EN ISO 868) |
Abrasion Resistance
weight loss H22 wheel and 1 kg load | 1090 mg |
Resistance to Impact
Class II: ≥ 10 Nm | (EN ISO 6272-1) |
Tensile Adhesion Strength
Adhesion to concrete | > 3.0 N/mm² |
Thermal Resistance
-30 °C to +80 °C
Capillary Absorption
| 0.02 kg/m2·h0.5 | (EN ISO 7783-2) |
Permeability to Water Vapour
SD = 7 m | (EN 1062-3) |
Diffusion Resistance to Carbon Dioxide
| SD > 750 m | (EN 1062-6) |
Chemical Resistance
Chemicals | Resistance to severe chemical attack: |
Group 1: Gasoline Group 3: heating oil, Diesel fuel, unused motor and gear oils Group 5: Mono- & poly alcohols, glycol ethers Group 10: Mineral acids (non oxidizing) ≤ 20% and inorganic salts in aqueous solution (pH<6) Group 11: Inorganic bases and their hydrolysing salts in aqueous solution (pH>8) Group 12: solutions of inorganic non-oxidizing salts with a pH value between 6 and 8 Group 14: Aqueous solutions of organic surfactants | Class II (28d without pressure) |
For more information on chemical resistance, please contact our technical service.
Resistance to Weathering
| Adhesion strength after freeze-thaw with de-icing salts (50 cycles) and thunder shower (10 cycles) | > 2.5 N/mm² no blisters, scaling or cracking |
Behaviour After Artificial Weathering
No defects observed | (EN 1062-11) |
Reaction to Fire
Class Bfl-s1
Application
Layer Thickness
Application thickness (wet film) | |
1st coat (200 g/m²) | 150 µm |
2nd coat (250 g/m²) | 185 µm |
Minimum total thickness, 2 coats (dry film) | 200 µm |
Product Temperature
+10 °C to +30 °C
Ambient Air Temperature
+10 °C to +30 °C
Relative Air Humidity
≤ 80 %
Substrate Temperature
+10 °C to +30 °C
Substrate Moisture Content
Substrate can be damp, but not wet.
Pot Life
At +30 °C | approx. 40 – 60 minutes |
At +20 °C | approx. 70 – 90 minutes |
At +10 °C | approx. 120 – 150 minutes |
Waiting Time / Overcoating
approx. 12 - 18 hours*
Applied Product Ready for Use
Walkable after | approx. 24 hours* |
Fully cured after | 7 days* |
* At 21±2 °C and 60±10% relative humidity. Higher temperatures or lower R.H. will shorten these times, and vice versa.
Consumption
A minimum of two coats is required.
First layer consumption is approx. 0.2 kg/m².
Second and subsequent coats require approx. 0.25 to 0.3 kg/m² each.
These consumptions are theoretical and can vary according to the absorption and roughness of the substrate. It is essential to carry out representative trials on site to evaluate the exact consumption.
SUBSTRATE PREPARATION
All substrates (new and old) must be structurally sound, dry, free of laitance and loose particles and clean of oil, grease, rubber skid marks, paint stains and other adhesion impairing contaminants.
The surface should be prepared by shot blasting, high-pressure water jetting or other suitable mechanical method.
After surface preparation the tensile strength of the substrate should exceed 1.5 N/mm² (check with an approved pull-off tester).
The temperature of the substrate must be at least 3 °C above the current dew point temperature.
Try to keep the temperature uniform during application and hardening.
MIXING
Sikagard® M 338 is supplied in two separate components in the correct quantities, ready for mixing.
Pour Part B into Part A, ensuring to completely empty the pack of Part B, and mix with a slow speed drill and paddle (maximum 400 rpm) until a homogeneous mixture is obtained.
Avoid the inclusion of air. Part mixes are strictly forbidden.
APPLICATION
Sikagard® M 338 has to be applied in two coats, if required in three coats. The consumption per coat depends on the roughness of the substrate and the type of application.
Dilute the material with 10% clean tap water for the first coat. Subsequent layers need to be applied undiluted, when the first one is touch dry.
Sikagard® M 338 can be applied using a brush, a short hair roller or an air-less spray gun.
Parameters for spraying:
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Pressure: approx. 220 bar
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Flow rate: min. 5 l/min
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Nozzle size: min: 0.83 mm.