Sikalastic®-870 BT
Fast curing liquid applied pure polyurea membrane with high acidic and alkaline chemical resistance
Sikalastic®-870 BT is a two part, elastic, polyurea liquid applied membrane. It features a high acidic and alkaline chemical resistance and a very fast curing time.
- Almost immediate return-to-service time
- Very good crack-bridging ability
- Good resistance to abrasion
- Good resistance to specific chemicals
- Very fast reactivity and curing time
- Impermeable to liquids
Usage
The Product is used as a waterproof coating on concrete, cementitious, and steel surfaces including:- Primary and secondary containments
- Wastewater treatment plants
- Mines and mining processes
- Ballast tanks
- Silage tanks and troughs
- Sludge digesters
Advantages
- Almost immediate return-to-service time
- Very good crack-bridging ability
- Good resistance to abrasion
- Good resistance to specific chemicals
- Very fast reactivity and curing time
- Impermeable to liquids
Packaging
Part A (Isocyanate) | 200 kg drum (net) |
Part B (Polyamine) | 175 kg drum (net) |
Part C (Colour) | 15 kg container (net) |
Colour
Part A | Clear –Light Yellowish liquid |
Part B | Medium brown liquid |
Part C | Grey liquid |
IMPORTANT
Discolouration due to exposure to sunlight
When the product is exposed to direct sunlight there may be some discolouration and colour variation. This has no influence on the function and performance of the membrane. Contact your Sika technical services to check if a UV resistant product is required.
Product Details
APPROVALS / STANDARDS
J.S. Manual (Layer method for method categories C and D) - Technologies for concrete structures of sewage works (Version of July 2007)
Chemical Base
Pure Polyurea
Shelf Life
Part A | 12 months from date of production |
Part B | 12 months from date of production |
Part C | 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 +5 °C and +30 °C. Protect the Product from direct sunlight. Always refer to packaging.
Density
Part A | 1.05 kg/L |
Part B | 1.00 kg/L |
Part C | 1.05 kg/L |
Density values determined at +23 °C
Solid content by weight
100 %
Shore D Hardness
< 42 | (JIS K 6253-1) |
Resistance to Impact
No cracks or peels | (JIS A 6916) |
Tensile Strength
> 18 N/mm² | (JIS K 6252-1) |
Tear Strength
> 75 N/mm² | (JIS K 6252-1) |
Service Temperature
Performs in constant dry temperatures from -30 °C to +60 °C
Permeability to Water Vapour
0 g | (JIS A 1404) |
Chemical Resistance
Resistance to alkali | No bulges, cracks or peels |
The Product is not resistant to biogenic sulphuric acid.
Application
Mixing Ratio
Part A : Part B + Part C = 1 : 1
Layer Thickness
> 2 mm
Product Temperature
Part A | +67 °C |
Part B + Part C | +53°C |
Ambient Air Temperature
Maximum | +40 °C |
Minimum | - 5 °C |
Relative Air Humidity
< 85 %
Dew Point
Beware of condensation. The substrate and uncured applied product must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the surface of the applied product. Low temperatures and high humidity conditions increase the probability of blooming.
Substrate Temperature
Maximum | +50 °C |
Minimum | 0 °C |
Curing Time
24 hours at +20 °C
Gel time
15 s at + 23 °C
Waiting Time / Overcoating
1–2 min at +23 °C
Consumption
1.10 kg/m² per mm thickness
EQUIPMENT
- Drum stirrer
-
Air driven or electrical 2K hot spray plural-equipment
SUBSTRATE QUALITY
- Cementitious substrates (concrete / screed) must be structurally sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum tensile strength of 1.5 N/mm2.
- Substrates must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings, laitance, surface treatments and loose friable material.
MIXING
Do not dilute with solvent or water.
- Pour all the container of Part C into the drum of Part B
- Thoroughly stir the single drum of coloured resin using a drum stirrer to obtain a uniform colour.
- Heat all three parts: Part A +67 °C : Part B + Part C +53°C.
- Dose and mix with the spray equipment making sure constant air pressure is maintained.
- Regularly check and control the accuracy of the mixing and dosage. The proportioning equipment must be capable of consistently supplying the correct pressure and heat.
APPLICATION
IMPORTANT
- Ventilation in confined spaces
- Always ensure good ventilation when applying the product in a confined space.
- No application on unprimed or unlevelled substrates
- Only apply the product on primed or levelled concrete and screed surfaces.
- No application on rising moisture
- Do not apply on substrates with rising moisture.
- No application on out-gassing substrates
- Do not apply on porous surfaces where significant moisture vapour transmission (out-gassing) will occur during application.
- Apply the product using compatible electrical 2-component hot spray plural equipment.
CLEANING OF TOOLS
Clean all tools and application equipment with Sika® Thinner C or approved solvent immediately after use. The application equipment must be cleaned and filled with Mesamoll. Hardened material can only be removed mechanically.