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
- Flexible, elastic (shore A 75)
- More uniform load distribution into substructure
- Reduces erosion of concrete under baseplate
- Watertight undersealing
- 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
Product Details
Composition
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
- SikaCor®-299 Airless (Steel deck / baseplate / rail coating)
- Icosit® KC 330 Primer
- Sika® Icosit® KC 340/7
Shore A hardness
| 75 ± 5 (after 28 days) | (ISO 868) |
Shore hardness assists with material identification and assessing the curing progress on site.
Tensile strength
| ~3,5 N/mm2 | (ISO 527) |
Chemical resistance
Long-term resistant against:
- Water
- Most detergents
- Sea water
Short-term resistant against:
- Mineral oils, diesel fuel
Short-term or no resistance against:
- Organic solvents (ester, ketone, aromates) and alcohol
- Concentrated lyes and acids
Contact Sika Technical Services for specific information.
Electrical resistivity
| ~2,34 × 109 Ω·m | (DIN VDE 0100-610 and DIN IEC 93) |
Service temperature
-40 °C min. / +80 °C max.
short term up to +150 °C
Compressive stiffness
Load-Deflection Diagram
Static stiffness determined according to DIN 45673-1.
Dimensions of test specimen 360 × 160 × 25 mm.
Spring index kstat = 53 kN/mm (±10 %), determined as per the secant method between 17 kN and 68 kN.
Application
Mixing ratio
Part A : Part B = 100 : 15 (parts by weight)
Layer thickness
15 mm min.
60 mm max.
Material 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 % max.
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 to overcoating
| Minimum | Maximum | |
| Icosit® KC 330 Primer | 1 hour | 3 days |
| SikaCor®-299 Airless | 24 hours | 7 days |
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.
The following mixing instructions must be carried out:
- Use an electric or pneumatic mixer with basket type 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 EQUIPMENT
Mixing and application tools must be cleaned at regular intervals and immediately after use with Sika® Reinigungsmittel-5. Hardened material can only be removed mechanically.