Sikalastic®-8850
Polyurea spray applied chemical resistant membrane
Sikalastic®-8850 is a 2-part, pure polyurea, hot spray applied, elastic, very fast curing, waterproofing membrane. Provides a seamless, abrasion and chemical resistant finish for liquid retaining structures. Suitable for use in hot and tropical climatic conditions.
- Seamless
- Very fast reactivity and curing time
- Almost immediate return-to-service time
- Performs in constant dry temperatures from -30 °C to +100 °C
- Good crack bridging properties
- Good chemical and abrasion resistance
Usage
Concrete:- Abrasion resistant protective coating in industrial and manufacturing facilities
- Waterproofing for cut and cover structures, submersed structures, walkways and balconies, floors and car park decks
- Water retaining structures in power plants
- Secondary containment structures
- Tank, bund and pit lining in sewage and waste water treatment plants
- Truck bed lining
- Wear resistant coating on hydraulic steel structures
Advantages
- Seamless
- Very fast reactivity and curing time
- Almost immediate return-to-service time
- Performs in constant dry temperatures from -30 °C to +100 °C
- Good crack bridging properties
- Good chemical and abrasion resistance
Packaging
| Component A (ISO) | 200 L drum (225 kg) |
| Component B (Resin) | 200 L drum (205 kg) |
Colour
Grey
Product Details
Composition
Pure Polyurea
Shelf life
| Component A (ISO) | 12 months from date of production |
| Component B (Resin) | 12 months from date of production |
Storage conditions
Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Density
| Component A (ISO) | ~1.00 |
| Component B (Resin) | ~1.15 |
Solid content by weight
| ~100 % | (EN 13823) |
Shore D Hardness
| ~48 | (EN ISO 868) |
Tensile Strength
| ~17 MPa | (ISO 527-1) |
Tensile Adhesion Strength
| ≥ 1.5 MPa (to concrete) | (EN 1542) |
Tear Strength
| ~90 kN/m | (ISO 34-1) |
Crack Bridging Ability
| Class A 4 (static) | (EN 1062-7) |
| Class B 3.1 (dynamic) | (EN 1062-7) |
Chemical Resistance
Sikalastic®-8850 is resistant to de-icing salts, bitumen, alkalis, fresh and ground water and various chemicals. Contact Sika Technical Service for specific information.
Application
Mixing Ratio
Comp. A : Comp. B = 1 : 1
Layer Thickness
~2mm
Product Temperature
| Comp. A (ISO) | +60 °C min. / +80 °C max |
| Comp. B (Resin) | +60 °C min. / +80 °C max |
Ambient Air Temperature
+5 °C min. / +50 °C max.
Relative Air Humidity
≤ 85 %
Dew Point
Beware of condensation.
The substrate and uncured coating finish must be at least 3 °C above dew point to reduce the risk of condensation.
Substrate Temperature
+5 °C min. / +50 °C max.
Substrate Moisture Content
Refer to primer product data sheet
Curing Time
Fully cured after 24 h (23 °C)
Gel time
8–10 seconds
Waiting Time / Overcoating
For overcoating with Sikalastic®-8850 or suitable UV resistant top coats allow:
| Substrate Temperature | Minimum | Maximum |
| 10 °C | 10–15 s | 7 h |
| 23 °C | 10–15 s | 6 h |
| 30 °C | 10–15 s | 5 h |
Consumption
~1 kg/m²/mm
SUBSTRATE QUALITY
Cementitious substrates (concrete) must be structurally sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum tensile strength of 1.5 N/mm2.
Cementitious substrates and steel surfaces must be clean, dry and free of all contaminants such as dirt, oil, grease, existing coatings and surface treatments, etc.
SUBSTRATE PREPARATION
Cementitious substrates
Must be prepared mechanically using suitable abrasive blast/water jetting cleaning equipment to remove cement laitance and achieve an open textured surface profile suitable for the product thickness.
Weak cementitious substrates must be removed and surface defects such as blow holes and voids must be fully exposed.
Priming, repairs to the substrate, filling of cracks, blowholes/voids and surface levelling must be carried out using appropriate products from the Sikafloor®, Sikadur® and Sikagard® range of materials. All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by brush or vacuum. Products must be cured before applying Sikalastic®-8850.
For detailed information regarding substrate preparation and primer chart please refer to Method Statement.
Substrate Pre-Treatment Substrate Primer
| Cementitious substrates | Sikafloor®-161 lightly broadcast with quartz sand, 0.3 – 0.8 mm, for example Sikadur®-507 |
For the consumption rates and waiting time / overcoating please refer to the PDS of the appropriate primer. Other substrates must be tested for their compatibility. If in doubt, apply a test area first.
Steel surfaces
Must be prepared mechanically using suitable abrasive blast/water jetting cleaning equipment to the requirements of the proposed manufacturer's corrosion protection system.
All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by vacuum extraction equipment.
After preparation, apply suitable primer, contact Sika Technical Department for more information.
MIXING
Dose and mix with a suitable air driven or electrical plural component heated spray equipment.
Both components must be heated up to the temperatures: Comp. A ( ISO): ~60 °C and Comp. B (Resin): ~80 °C.
The accuracy of mixing and dosage must be controlled regularly with the equipment. Thoroughly stir part B (Resin) using a drum stirrer until a consistent colour is obtained.
APPLICATION
Sikalastic®-8850 is spray applied in a continuous application to achieve a consistent thickness and surface finish.
CLEANING OF EQUIPMENT
Clean all tools with Thinner C immediately after use. The application equipment has to be cleaned and filled with Mesamoll. Hardened material can only be removed mechanically.