Sikalastic®-450 (I) is a single component, elastomeric, aliphatic polyurethane based liquid applied waterproof coating system. It cures to form a highly elastic, seamless, waterproof coating with excellent crack bridging properties.
Key Features
✔ Excellent crack bridging properties
✔ Elastomeric membrane that cures with aerial moisture to a flexible and rubbery coating
✔ Single component, ready to use
Chemical Base
Aliphatic polyurethane modified bituminous emulsion
Shelf Life
12 months from the date of production
Storage Conditions
Store in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5°C and +30°C.
Density
1.20 ± 0.05 kg/liter
Solid Content by Weight
Standard Coating System
| System Build-Up | Product |
|---|
| Primer | Sikalastic®-450 (I) diluted with water 1:1 by weight |
| Base Coat | Sikalastic®-450 (I) |
| Top Coat | Sikalastic®-450 (I) |
| System Build-Up | Product |
|---|---|
| Primer | Sikalastic®-450 (I) diluted with water 1:1 by weight |
| Base Coat | Sikalastic®-450 (I) |
| Fabric Reinforcement | Sika® Fab-1 |
| Top Coat | Sikalastic®-450 (I) |
Tensile Strength
≥ 3.0 N/mm² (ASTM D412)
After 14 days at +27°C with Sika® Fab-1
Crack Bridging Ability
Passes 3 mm Mandrel (IS 101)
Permeability to Water Vapour
~25 g/m²/day (IS 101)
Water Absorption
Negligible
Thermal Resistance
>120°C (Softening Point) (ASTM D36)
Behaviour after Artificial Weathering
No cracking and no blistering (500 hours) (IS 101)
Service Temperature
-20°C to +80°C
Dry Film Thickness
1.0 mm — Standard Coating System
1.2 mm — Reinforced Coating System
Ambient Air Temperature
+10°C min. / +40°C max.
Relative Air Humidity
80% max.
Substrate Temperature
+10°C min. / +40°C max.
Dew Point
Beware of condensation! The substrate and uncured membrane must be at least 3°C above the dew point to reduce the risk of condensation.
Substrate Moisture Content
< 6%
Pot Life
~ 3 hours at 30°C
Waiting Time / Overcoating
| Application Stage | Waiting Time |
|---|---|
| Primer to Base Coat | 2–4 hours |
| Base Coat to Sika® Fab-1 | Immediately in wet Base Coat |
| Top Coat to Base Coat | 24 hours |
| Top Coat to Protection Screed | 7–10 days |
Tack Free Time
~12–20 hours at 20°C and 50% Relative Humidity
Drying Time
Full Cure requires about 7 days at 30°C