2-part polyurethane grout under discrete baseplates of tram / light rail tracks
Sika® Icosit® KC 340/4 is a flexible two-part polymer grout based on polyurethane resin. It is designed as a vibration absorbing, load-bearing, flexible grout for the precision alignment of rails, turnouts / switches, etc. Sika® Icosit® KC 340/4 is also used for fixing track components to rigid substrates such as concrete slabs, steel bridge decks and tunnel invert slabs.
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Medium axle loads of trams and light-rail vehicles.
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Noise and vibration suppression.
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Reduces erosion of concrete under baseplate.
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More uniform load distribution into substructure.
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Watertight undersealing.
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Flexible, elastic (shore A 65).
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Damping, compressible.
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Good electrical insulation against stray currents.
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No stress peaks on anchor bolts.
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Excellent adhesion on various substrates.
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Levels out tolerances.
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Suitable as a powerful, shear-resistant adhesive.
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Absorbs dynamic stresses and prolongs the life of concrete substructure.
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Insensitive to moisture.
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Long durability, less maintenance.
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Usage
As a noise and vibration reducing grout under discrete baseplates of tramway or light rail track sections.
Advantages
- Medium axle loads of trams and light-rail vehicles.
- Noise and vibration suppression.
- Reduces erosion of concrete under baseplate.
- More uniform load distribution into substructure.
- Watertight undersealing.
- Flexible, elastic (shore A 65).
- Damping, compressible.
- Good electrical insulation against stray currents.
- No stress peaks on anchor bolts.
- Excellent adhesion on various substrates.
- Levels out tolerances.
- Suitable as a powerful, shear-resistant adhesive.
- Absorbs dynamic stresses and prolongs the life of concrete substructure.
- Insensitive to moisture.
- Long durability, less maintenance.
Packaging
Part A | 5,46 kg container | Part B | 0,54 kg container | A+B | 6 kg |
Refer to current price list for packaging variations.
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Technical Information
Shore A Hardness
65 ± 5 (after 28 days) | (ISO 868) |
Shore hardness assists with material identification and assessing the curing progress on site.
Compressive stiffness
Load-Deflection Diagram

Static stiffness determined according to DIN 45673-1.
Dimensions of test specimen 360 × 160 × 25 mm;
Spring index kstat = 29 kN/mm, determined as per the secant method between 8 and 32 kN.
Electrical Resistivity
~1,22 × 109 Ω·m | (DIN VDE 0100-610 and IEC 93) |
Service Temperature
-40 °C minimum / +80 °C maximum
short term +150 °C maximum
Chemical Resistance
Long-term resistant against:
- Water
- Most detergents
- Sea water
Temporary resistant against:
- Mineral oils, diesel fuel
Short-term or no resistance against:
- Organic solvents (ester, ketone , aromates) and alcohol
- Concentrated acids and lyes
Contact Sika® Technical Services for specific information.
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Application Information
Mixing Ratio
Part A : Part B = 100 : 10 (parts by weight)
Layer Thickness
15 mm minimum
60 mm maximum
Product Temperature
Condition product parts before application preferably at ~+15 °C to assist with flow and curing speed
Ambient Air Temperature
+5 °C minimum / +35 °C maximum
Relative Air Humidity
90 % maximum
Substrate Temperature
+5 °C minimum / +35 °C maximum
Substrate Moisture Content
Dry to matt damp
Pot Life
~11 minutes at +20 °C
After this time, the mixture becomes unusable.
Higher temperatures will shorten pot life.
Curing Time
Tack-free ~2 hours at +20 °C
Trafficable ~12 hours at +20 °C
Curing Rate
| Shore A Hardness Values at Different Curing Temperatures | Curing Time | 0 °C | 5 °C | 23 °C | 35 °C | 1 Hour | - | - | | ~20 | 2 Hours | - | - | ~20 | ~35 | 4 Hours | - | ~15 | ~30 | ~40 | 7 Hours | ~25 | ~25 | ~40 | ~50 | 1 Day | ~40 | ~40 | ~50 | ~55 | 2 Days | ~45 | ~45 | ~55 | ~60 | 3 Days | ~50 | ~50 | ~60 | ~60 | 7 Days | ~55 | ~55 | ~60 | ~60 | 14 Days | ~55 | ~55 | ~60 | ~60 |
Waiting Time / Overcoating
On primer or coating at +20 °C
| Minimum | Maximum | Icosit® KC 330 Primer | 1 hour | 3 days | Sikadur®-32+ | 24 hours | 7 days |
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The above design is only a sample of the options available, for reference purposes only. Our policy of continuous improvement may result in a change of specifications without notice. If any discrepencies might be between the data sheet values and standards, we reserve the rights to make technical changes. Our company will not be held responsible, as all or any of pictures, drawings, weights and dimensions details or other elements in this document are only indicative and must not be considered contractual. Contact our sales team for other specifications or custom made products.
Contact our sales team for other specifications or custom made products.