Sika® Icosit® KC 340/7
Sika® Icosit® KC 340/7 is a flexible 2-part polyurethane polymer resin grout. It is designed as a vibration absorbing, load-bearing, flexible grout for the precision alignment of rails, turnouts/switches etc. Sika® Icosit® KC 340/7 is also used for fixing track components to rigid substrates such as concrete slabs, steel bridge decks and tunnel invert slabs.
- Heavy axle load vehicles.
- Noise & vibration suppression.
- Reduces erosion of concrete under baseplate.
- More uniform load distribution into substructure.
- Watertight undersealing.
- Flexible, elastic (shore A 75).
- 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.
Usage
As a noise and vibration reducing grout under discrete baseplates of main-line track sections.Advantages
- Heavy axle load vehicles.
- Noise & vibration suppression.
- Reduces erosion of concrete under baseplate.
- More uniform load distribution into substructure.
- Watertight undersealing.
- Flexible, elastic (shore A 75).
- 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 | 5,22 kg container |
| Part B | 0,78 kg container |
| A+B | 6 kg |
Colour
Black
Product Details
Chemical Base
2-part polyurethane
Shelf Life
12 months from date of production
Storage Conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +25 °C. Always refer to packaging.
Density
| Part A | ~1 kg/l | (ISO 2811-1) |
| Part B | ~1,2 kg/l | (ISO 2811-1) |
| A + B | ~1 kg/l | (ISO 1183-1) |
System Structure
- Sika® Icosit® KC 340/7
- Sikadur®-32 +: For green and wet concrete
- Icosit® KC 330 Primer
- SikaCor®-299 Airless (Steel deck / baseplate /rail coating)
Shore A Hardness
| 75 ± 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.
Test specimen dimensions: 360 × 160 × 25 mm
(pure material value measured without rail)
Preload: 1,000 N
Testing speed: 2 kN/s
Maximum load: 50 kN
Bedding figure kstat = ~44 [(kN/mm)/m] (±10 %)*, determined as per the secant method between 17 and 68 kN.
*Deviation of the bedding figure and the curve are ±10%.
Tensile Strength
| ~3,5 N/mm2 | (ISO 527) |
Electrical Resistivity
| ~2,34 × 109 Ω·m | (DIN VDE 0100-610 and DIN IEC 93) |
Service Temperature
-40 °C minimum / +80 °C maximum
short term up to +150 °C
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.
Application
Mixing Ratio
Part A : Part B = 100 : 15 (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 min. / +35 °C max.
Relative Air Humidity
90 % maximum
Substrate Temperature
+5 °C min. / +35 °C max.
Substrate Moisture Content
Dry to matt damp
Pot Life
~8 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 | Curing Temperature | |||
| Curing Time | 0 °C | 5 °C | 23 °C | 35 °C |
| 1 h | - | - | ~45 | ~55 |
| 2 h | - | ~20 | ~50 | ~60 |
| 4 h | ~25 | ~40 | ~55 | ~65 |
| 7 h | ~45 | ~50 | ~60 | ~65 |
| 1 d | ~60 | ~60 | ~65 | ~70 |
| 2 d | ~65 | ~65 | ~70 | ~70 |
| 5 d | ~65 | ~70 | ~70 | ~75 |
| 7 d | ~70 | ~70 | ~75 | ~75 |
| 14 d | ~75 | ~75 | ~75 | ~75 |
Waiting Time / Overcoating
On primer or coating at +20 °C
| Minimum | Maximum | |
| Icosit® KC 330 Primer | 1 h | 3 d |
| SikaCor®-299 Airless | 24 h | 7 d |
| Sikadur®-32 + | 24 h | 7 d |
Consumption
~1 kg per litre of volume to be sealed
SUBSTRATE QUALITY
Substrate must be sound, free from oil, grease, loose and friable particles.
Slightly damp substrates are acceptable. Standing water must be removed (e.g. by vacuum extraction or oil free compressed air) before pouring Sika® Icosit® KC 340/7.
SUBSTRATE PREPARATION
To improve adhesion, apply Icosit® KC 330 Primer as a primer on absorbent substrates (concrete).
For additional corrosion protection, use SikaCor®-299 Airless and Icosit KC 330 Primer in combination to coat the steel surfaces.
Immediately blind (broadcast) the freshly applied coated surfaces with quartz sand (0,4–0,7 mm granulometry).
Always comply with the waiting time limits between application of SikaCor®-299 Airless, Icosit KC 330 Primer and pouring of Sika® Icosit® KC 340/7.
Refer to the individual Product Data Sheets for more information.
MIXING
Sika® Icosit® KC 340/7 is supplied in pre-weighed composite units consisting of parts A + B. Part A must be stirred thoroughly before being mixed with part B.
6 kg units
The following mixing instructions must be carried out:
Use an electric or pneumatic mixer with basket type stirrer or helical stirrer, diameter 120–140 mm, speed ~600–800 rpm.
Mixing time ~60–80 seconds
Ensure material is mixed from the container walls and the base by the stirrer during mixing.
CLEANING OF TOOLS
Mixing and application tools must be cleaned at regular intervals and immediately after use with Sika® Cleaner 5. Hardened material can only be removed mechanically.