Sikafloor®-19 NA PurCem®
ADVANCED GENERATION, HEAVY DUTY AND THERMAL SHOCK RESISTANT, TROWEL GRADE POLYURETHANE / CEMENT SCREED
Sikafloor®-19 NA PurCem® is a state-of the-art, traditional trowel grade, heavy-duty, phthalate-free, water-dispersed polyurethane based/cement, and aggregate screed applicable at thicknesses ranging from 6 to 9 mm (1/4 to 3/8 in). It is designed to provide excellent resistance to abrasion, impact, chemical attack, thermal shock, and other physical aggression. Sikafloor®-19 NA PurCem® has an embedded coarse aggregate hand trowelled surface texture that provides good traction. Selected aggregate can be broadcast onto the wet screed to increase surface texture for improved traction. Sikafloor®-19 NA PurCem® represents superior polyurethane/cement technology, combining easier application, resistance to blistering and improved performance.
- Can be applied onto 7 to 10 day old concrete after adequate preparation and where substrate has tensile bond strength in excess of 1.5 MPa (218 psi).
- Longer pot life permits increased productivity with less waste.
- Resists a very wide range of organic and inorganic acids, alkalis, amines, salts and solvents. Consult Sika Technical Service for full details. Refer to the Sikafloor®-19 NA PurCem® Chemical Resistance Chart.
- Similar coefficients of thermal expansion to concrete allowing movement with the substrate through normal thermal cycling.
- Performs and retains its physical characteristics through a wide temperature range from -40 °C (-40 °F) up to 120 °C (248 °F).
- Superior formulation eliminates formation of blisters, such as those arising out of application during elevated temperatures or early and multiple layer applications.
- Steam cleanable at 6 - 9 mm (1/4 - 3/8 in) thickness. Can also be easily maintained using commonly employed methods and phenol-free detergents.
- Bond strength in excess of the tensile strength of concrete, concrete will fail first.
- Non-taint, odourless and phthalate-free, avoiding associated toxicity to health and environmental hazards.
- Behaves plastically under impact; deforms but will not crack or debond.
- Extra Expansion joints are not necessary; maintain and extend existing expansion joints up through the Sikafloor PurCem Flooring System.
- Achieves the highest performance ratings according to ASTM G21 resistance to fungi and ASTM D3273 resistance to mold growth.
Usage
- Sikafloor®-19 NA PurCem® floors are primarily used to protect concrete substrates, but are equally effective over most steel surfaces that have been properly prepared and supported
- Food processing plants, wet & dry process areas, freezers & coolers, thermal shock areas, commercial kitchens, dairies, breweries, wineries, distilleries, laboratories, chemical process plants, pulp and paper plants, warehouses and storage areas
Advantages
- Can be applied onto 7 to 10 day old concrete after adequate preparation and where substrate has tensile bond strength in excess of 1.5 MPa (218 psi).
- Longer pot life permits increased productivity with less waste.
- Resists a very wide range of organic and inorganic acids, alkalis, amines, salts and solvents. Consult Sika Technical Service for full details. Refer to the Sikafloor®-19 NA PurCem® Chemical Resistance Chart.
- Similar coefficients of thermal expansion to concrete allowing movement with the substrate through normal thermal cycling.
- Performs and retains its physical characteristics through a wide temperature range from -40 °C (-40 °F) up to 120 °C (248 °F).
- Superior formulation eliminates formation of blisters, such as those arising out of application during elevated temperatures or early and multiple layer applications.
- Steam cleanable at 6 - 9 mm (1/4 - 3/8 in) thickness. Can also be easily maintained using commonly employed methods and phenol-free detergents.
- Bond strength in excess of the tensile strength of concrete, concrete will fail first.
- Non-taint, odourless and phthalate-free, avoiding associated toxicity to health and environmental hazards.
- Behaves plastically under impact; deforms but will not crack or debond.
- Extra Expansion joints are not necessary; maintain and extend existing expansion joints up through the Sikafloor PurCem Flooring System.
- Achieves the highest performance ratings according to ASTM G21 resistance to fungi and ASTM D3273 resistance to mold growth.
Packaging
184.72 kg (407.23 lb) - 87.13 L (23.01 US gal) unit
Consists of 3 Components: A + B + C
Part A: 8 x 1.93 kg (4.25 lb) foil pouches in a cardboard box.
Part B: 8 x 1.66 kg (3.66 lb) foil pouches in a card board box.
Part C: 8 x 19.5 kg (42.99 lb) multi-wall paper bags.
NOTE: A 184.72 kg (407.23 lb) unit will produce 8 x 23.09 kg (50.90 lb) mixes.
Colour
RAL 3009 Oxide Red, RAL 7038 Agate Grey, Sika® Medium Grey (Formely Telegrey 2), RAL 1001 Beige, RAL 5005 Signal Blue.
Special colours (on request). Refer to current price list for availability.
Product Details
ENVIRONMENTAL INFORMATION
- Conformity with LEED®v4 IEQ Credit: Low-Emitting Materials.
- Conformity with LEED®v4 MR Credit (Option 1): Building Product Disclosure and Optimization - Sourcing of Raw Materials.
APPROVALS / CERTIFICATES
- Meets the requirements of CFIA and USDA for use in food plants.
Shelf Life
12 months in original unopened packaging.
Storage Conditions
Store dry between 10 °C to 25 °C (50 °F to 77 °F)
Protect from freezing. If frozen, discard.
Density
| ~2.12 kg/L (~17.67 lb./US gal.) | (ASTM C905) |
Volatile organic compound (VOC) content
A+B+C = ~5 g/L
Shore D Hardness
| ~82 | (ASTM D2240) |
Abrasion Resistance
| ~0.22 g (~0.007 oz) CS-17 / 1000 cycles / 1000 g (2.2 lb) | (ASTM D4060) |
| ~2.32 g (~0.081 oz) H-22 / 1000 cycles / 1000 g (2.2 lb) |
Resistance to Impact
| ~5.67 joules (~4.18 ft*lb) | (ASTM D2794) |
Indentation
| ~0% | (MIL-PRF-24613) |
Compressive Strength
| 24 hours | ~25 MPa (~3626 psi) |
| 3 days | ~32 MPa (~4641 psi) |
| 7 days | ~36 MPa (~ 5222 psi) |
| 28 days | ~38 Mpa (~5512 psi) |
Tensile Strength in Flexure
| ~9.9 MPa (~1436 psi) | (ASTM C580) |
Modulus of Elasticity in Flexure
| ~2913 MPa (~422 588 psi) | (ASTM C580) |
Tensile Strength
| ~4.2 MPa (~609 psi) | (ASTM C307) |
Pull-Off Strength
| > 3.0 MPa (> 435 psi) (substrate failure) | (ASTM D7234) |
Shrinkage
| ~0.116% | (ASTM C531) |
Coefficient of Thermal Expansion
| ~2.6 x 10-5 mm/mm/°C (~1.44 x 10-5 in/in/°F) | (ASTM D696) |
Skid / Slip Resistance
| ~0.61 wet (trowel finish) | (ANSI A137.1 / ANSI A326.3) DCOF - BOT 3000e |
Service Temperature
Minimum -40 °C (-40 °F) / Maximum 120 °C (248 °F)
Softening Point
~130°C (~266°F)
Thermal Compatibility
| Pass | (ASTM C884) |
Water Absorption
| ~0.28 % | (ASTM C413) |
Chemical Resistance
Consult Sika Canada
Microbiological Resistance
| Resistance to Fungi Growth | Rated 0 (no growth) |
| Resistance to Mold Growth | Rated 10 (highest resistance) |
Application
Mixing Ratio
Components A: B: C = A x 1 : B x 1: C x 1 (per mix)
Product Temperature
Condition product between 18 °C to 24 °C (65 °F to 75 °F) before use.
Mixing and application attempted at material, ambient and/or substrate temperature conditions less than 18 °C (65 °F) will result in a decrease in product workabitity and slower cure rates.
Ambient Air Temperature
Minimum 7 °C (45 °F) / Maximum 38 °C (100 °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 7 °C (45 °F) / Maximum 38 °C (100 °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
Sikafloor®-19 NA PurCem® can be applied on substrates with higher moisture content. Check for rising moisture. The substrate must be visably dry with no ponding water and must have a minimum pull-off strenght of 1.5 MPa (218 psi).
IMPORTANT: Early application on green or young concrete before drying shrinkage has stabalized may result in reflective cracks on the finished Sikafloor®-19 NA PurCem® surface post application.
Pot Life
~25 minutes
Curing Time
| Foot traffic | ~18 hours |
| Light traffic | ~24 hours |
| Normal traffic (full cure) | ~5 days |
Curing times will vary according to air and substrate temperature and relative humidity.
Protect from dampness, condensation from pipes or any overhead leaks and water contact during the initial 24 hour cure period.
Mechanical, chemical and physical properties will be fully achieved at full cure.
Consumption
Sikafloor®-19 NA PurCem® 1 x 23.09 kg mix (50.90 lb mix) consisting of:
1 Part A foil pouch + 1 Part B foil pouch + 1 Part C multi-wall paper bag
~1.8 m2 per 23.09 kg mix (~19 ft2 per 50.90 lb mix) at 6 mm (1/4 in) w.f.t.
~1.2 m2 per 23.09 kg mix (~13 ft2 per 50.90 lb mix) at 9 mm (3/8 in) w.f.t.
NOTE: A Sikafloor®-19 NA PurCem® 184.72 kg (407.23 lb) unit will produce
8 x 23.09 kg (50.90 lb) mixes.
Actual coverage rates and material consumption will depend upon porosity and profile of substrates. Allowance must be also made for variation in film thickness or number of coats required to achieve complete coverage of surfaces. Test sections are recommended to establish correct coverage.
MIXING
Mix Ratio: Components A:B:C (A x 1 : B x 1 : C x 1)
Do not hand mix Sikafloor® PurCem® materials; mechanically mix only. Mixing will be affected by temperature; condition materials for use to 18 °C to 24°C (65 °F to 75°F) for at least 24 hours before use. On no account should this product be thinned. Addition of thinners (eg. water or solvent) will retard the cure, reduce the ultimate properties of this product and void any applicable Sika warranty.
A Ted Baugh type mixer, incorporating a motor spun mixing pail and a shear angle mixing blade, is recommended. Pre-agitate Components A and B separately, making sure all solids, including pigments, are uniformly distributed. Start mixer; add Component A and Component B, blending for 30 seconds. Add Component C (powder) pouring slowly over a period of 20 seconds. DO NOT DUMP POWDER INTO RESIN, ADD GRADUALLY. Allow Component C to further blend for 2-1/2 more minutes after all of the powder is emptied into the resin to ensure all powder is wetted out and a completely uniform mix is achieved. During the mixing operation, and observing good safety practices, ie turning off and removing revolving parts, scrape down the sides and bottom of the mixing container with a flat or straight edge trowel at least once to ensure complete blending of Components A + B + C. Do not attempt to attend to unmixed material that may gather on the sides of the mixing container while mechanical or electrical parts are in motion.
Cool Substrates: Application attempted at material, ambient and substrate temperatures below 18 °C (65 °F) will result in a decrease in product workability and slower cure rates. Improved flowability on cool substrates can be achieved by removing a maximum of 1 kg (2.2 lb) of Component C (powder) per mix.
APPLICATION
Prior to application, measure and confirm substrate moisture content, ambient relative humidity, ambient and surface temperature and dew point.
During installation, confirm and record above values at least once every three (3) hours, or more frequently whenever conditions change (e.g. ambient temperature rise/fall, relative humidity increase/decrease, etc.).
Priming
There is sufficient resin in the system to wet the concrete so that priming of concrete substrates is not usually required under typical circumstances. However, due to variations in concrete quality, surface conditions, surface preparation and ambient conditions, reference test areas are recommended to determine whether priming is required to prevent the possibility of blisters, debonding, pinholes and other aesthetic variations.
Trowel Application
Trowel-grade materials are applied with normal steel plastering or cement-finishing trowel 300 x 100 mm (12 x 4 in). Do not use serrated hand trowels. Pour the material from the mixer pail along the wet edge. Using considerable top pressure on the trowel, spread material from side to side, push back into the previous mix (wet edge), pull forward to establish the thickness and then, with a lighter pressure, trowel from side to side to close up. The last few strokes should always be in one direction only, left to right or right to left, but never back and forth.
Note: Excessive trowelling will bring resin to the surface reducing the traction value of the textured surface.
Trowel and Broadcast Application
Mix and apply materials as outlined above under Trowel Application. Broadcast selected mineral aggregates on to the wet surface and seal with a top coat of Sikafloor®-31 NA PurCem® or Sikafloor®-33 NA PurCem® to lock in the aggregate. This application method requires a minimum 24 hours cure period at 20 °C (68 °F) before foot traffic, see Sikafloor®-31 NA PurCem® or Sikafloor®-33 NA PurCem® Product Data Sheet for additional information.
Important: Application attempted at material, ambient and substrate temperatures below 18 °C (65 °F) will result in a decrease in product workability and slower cure rates.
CLEAN UP
Clean all tools and equipment with Sika® Urethane Thinner and Cleaner. Once hardened, product can only be removed mechanically.
