Sikalastic®-270 NPR
Sikalastic®-270 NPR is a two-component, polyurethane base coat for use in Sikalastic® Traffic 2500, 2530, 2575 and 2850 deck coating systems. Sikalastic®-270 NPR is a base coat with outstanding mechanical properties, including excellent elongation without the use of primer.
- Primerless base coat can provide a simpler application process, along with material and labour cost savings
- Two-component base coat reduces overcoating times
- Seamless waterproof membrane helps protect concrete from freeze/thaw damage
- Can be used with or without a primer
Usage
- Stadiums
- Balconies
- Parking garages
- Commercial construction
- Building and restoration
- Plywood decks/balconies
- Plaza decks
Advantages
- Primerless base coat can provide a simpler application process, along with material and labour cost savings
- Two-component base coat reduces overcoating times
- Seamless waterproof membrane helps protect concrete from freeze/thaw damage
- Can be used with or without a primer
Packaging
18 L (4.76 US gal) pail
Colour
Part A: Light grey
Part B: Clear / Amber
A+B mixed: Light grey
Product Details
Shelf Life
12 months in original, unopened containers
Storage Conditions
Store dry, at temperatures between 5 °C and 32 °C (41 °F and 89 °F)
Solid content by volume
| 100 % | (ASTM D2697) |
Shore A Hardness
80 +/- 5
Abrasion Resistance
| 10 mg loss | (ASTM D4060) Taber Abraser, CS-17 Wheel: |
Tensile Strength
| 8.7 MPa (1262 psi) | (ASTM D638) Type IV |
Pull-Off Strength
| 2.2 MPa (319 psi) | (ASTMD 4541) |
Tear Strength
| 8.03 KN/m (210 lb/linear in) | (ASTM D624) Die C |
Crack Bridging Ability
| Passes: 1.6 mm (1/16 in) @ -26 °C | (ASTM C957) |
Chemical Resistance
Contact Sika Canada
Permeability to Water Vapour
| (ASTM E96) Procedure B |
Water Absorption
| 0.26 % | (ASTM D570) |
Application
Mixing Ratio
A : B = 2 : 1 per volume
Product Temperature
Condition the product at temperatures between 18 °C and 30 °C (65 °F and 86 °F) before use.
Ambient Air Temperature
| Minimum | 4 °C (40 °F) |
| Maximum | 32 °C (90 °F) |
Relative Air Humidity
Maximum 85 % (during application and curing)
Dew Point
Substrate must be at least 3 °C (5 °F) above the Dew Point to reduce the risk of condensation, which may lead to adhesion failure or "blushing" on the floor finish. Be aware that the substrate temperature may be lower than the ambient temperature.
Substrate Temperature
| Minimum | 4 °C (40 °F) |
| Maximum | 32 °C (90 °F) |
Do not apply while ambient and substrate temperatures are rising, as pinholes may occur. Ensure there is no vapour drive at the time of application. Refer to ASTM D4263, may be used for a visual indication of vapour drive.
Substrate Moisture Content
Moisture content of concrete substrate must be ≤ 4 % by mass (pbw – part by weight) as measured with a Tramex®CME / CMExpert type concrete moisture meter on mechanically prepared surface according to this product data sheet (preparation to ICRI / CSP 3 - 4). Do not apply to concrete substrate with moisture levels exceeding 4 % mass (pbw – part by weight) as measured with Tramex® CME / CMExpert type concrete moisture meter.
If moisture content of concrete substrate exceeds 4 % by mass (pbw – part by weight), don't appplied the product. Under these conditions, contact Sika Canada Inc. When relative humidity tests for concrete substrate are conducted per ASTM F2170 for project specific requirements, values must be ≤ 85 %. If values exceed 85 % according to ASTM F2170, contact Sika Canada Inc.
ASTM F2170 testing is not a substitute for measuring substrate moisture content with a Tramex® CME / CMExpert type concrete moisture meter as described above.
Pot Life
20 minutes
Curing Time
| Complete curing | 7 days |
Low temperatures and low humidity will slow the curing, while high temperatures and high humidity will accelerate it.
Waiting Time / Overcoating
| between 6 and 24 hours | (ASTM D1640) |
Consumption
1.2 - 1.6 m2/L (50 - 65 ft2/US gal) at 25 - 30 mil w.f.t.
Typically one (1) coat is required, though on higher absorbency substrates additional coats maybe required.
Note: Actual coverage rates and material consumption will depend upon porosity and profile of the substrate. Test areas are recommended to establish correct coverage rates.
MIXING
Precondition both A and B components to a temperature of approximately 21 °C (70 °F) before mixing.
Pre-mix each component of Sikalastic®-270 NPR separately. Add entire contents of Part A into Part B. Mix components for a minimum of three (3) minutes at slow-speed (300–450 rpm), using a drill fitted with an Exomixer® type mixing paddle (recommended model) and suited to the volume of the mixing container to minimize air entrapment. Scrape down sides and bottom of mixing vessel, then mix again for two (2) more minutes. Keep the paddle submerged in the material during mixing process to avoid entraping air into the mixture. When completely mixed, Sikalastic®-270 NPR should be uniform in colour and consistency.
Mix only the quantity of product that can be used within its pot life.
APPLICATION
Apply Sikalastic®-270 NPR using a properly notched squeegee and immediately back roll.
Refer to the applicable Sikalastic®Deck Coating system data sheet for total system and aggregate surface preparation and application. Extend base coat over entire area including previously detailed cracks and joints. Allow coating to cure a minimum of six (6) hours at +21 °C (70 °F) and 50 % R.H. before top coating.
Sikalastic®-270 NPR is applied without primer but also can be used with primer applications per system application instructions.
CLEAN UP
Uncured material can be removed from equipment and tools using Sika Cleaning Wipes or with a solvent, such as xylene. Strictly follow solvent manufacturer’s warnings and instructions for use. Cured material can only be removed manually or mechanically.
