Sikafloor®-31 NA PurCem®
ADVANCED GENERATION, HIGH-BUILD AND SOLVENT-FREE POLYURETHANE/CEMENT PRIMER, COATING AND TOP COAT
Sikafloor®-31 NA PurCem® is state-of-the-art, high-build coating with a matte finish, based upon phthalate-free, water-dispersed polyurethane/cement and aggregate technology applied at 10 mil per coat. It is designed as a standalone coating for concrete, as primer/sealer for Sikafloor®-22 NA PurCem® and as a top coat for Sikafloor® PurCem® broadcast textured systems. It is an economical and versatile material that improves adhesion and mitigates outgassing of substrates as a primer, while providing excellent chemical resistance properties and very good durability against abrasion and mechanical damage. Sikafloor®-31 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).
- Versatile material suitable for application as a primer, standalone coating and top coat for other PurCem systems.
- 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 Canada for full details. Refer to the Sikafloor® PurCem® Chemical Resistance Chart.
- Similar coefficient 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 -10 °C (14 °F) up to 90 °C (194 °F).
- Superior formulation eliminates formation of blisters, such as those arising out of application during elevated temperatures or early and multiple layer applications.
- 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.
- Excellent long term wear resistance from a two-coat application.
- Easily maintained using commonly employed methods and phenol-free detergents.
- Achieves highest performance ratings according to ASTM G21 resistance to fungi and ASTM D3273 resistance to mold growth.
Usage
- Sikafloor®-31 NA PurCem® is primarily used as a chemically resistant high build coating used to protect horizontal and vertical concrete substrates, but is equally effective over Sikafloor®-19 NA PurCem®, Sikafloor®-20 NA PurCem®, Sikafloor®-22 NA PurCem®, and Sikafloor®-29 NA PurCem®.
- Typically used in food processing plants, chemical storage areas, warehouses, washrooms, laboratories, food preparation areas and chemical process plants.
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).
- Versatile material suitable for application as a primer, standalone coating and top coat for other PurCem systems.
- 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 Canada for full details. Refer to the Sikafloor® PurCem® Chemical Resistance Chart.
- Similar coefficient 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 -10 °C (14 °F) up to 90 °C (194 °F).
- Superior formulation eliminates formation of blisters, such as those arising out of application during elevated temperatures or early and multiple layer applications.
- 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.
- Excellent long term wear resistance from a two-coat application.
- Easily maintained using commonly employed methods and phenol-free detergents.
- Achieves highest performance ratings according to ASTM G21 resistance to fungi and ASTM D3273 resistance to mold growth.
Packaging
44.16 kg (97.35 lb) - 30.66 L (8.10 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 1.93 kg (4.25 lb) in plastic pails.
NOTE: A 44.16 kg (97.35 lb) unit will produce 8 x 5.52 kg (12.16 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 MR Credit (Option 1): Building Product Disclosure and Optimization – Environmental Product Declarations.
• Conformity with LEED®v4 IEQ Credit: Low-Emitting Materials.
• Conformity with LEED®v4 MR Credit (Option 1): Building Product Disclosure and Optimization - Material Ingredients.
• 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
| ~1.44 kg/L (~11.99 lbs/US gal.) | ASTM C905 |
Volatile organic compound (VOC) content
A+B+C = ~5 g/L
Shore D Hardness
| ~81 | (ASTM D2240) |
Abrasion Resistance
| ~0.08 g (~0.003 oz) CS-17 / 1000 cycles / 1000 g (2.2 lb) ~0.153 g (~0.005 oz) H-22 / 1000 cycles / 1000 g (2.2 lb) | (ASTM D4060) |
Indentation
| ~0 % | (MIL-PRF-24613) |
Tensile Strength in Flexure
| ~31.8 MPa (~4613 psi) | (ASTM C580) |
Modulus of Elasticity in Flexure
| ~1896 MPa (~275 052 psi) | (ASTM C580) |
Tensile Strength
| ~15.38 MPa (~2231 psi) | (ASTM C307) |
Pull-Off Strength
| > 3.0 MPa (> 435 psi) (substrate failure) | (ASTM D7234) |
Shrinkage
| ~0.225 % | (ASTM C531) |
Skid / Slip Resistance
| ~0.63 wet (smooth) | (ANSI A137.1 / ANSI A326.3) DCOF - BOT 3000e |
Service Temperature
Minimum -10 °C (14 °F) / Maximum 90 °C (194 °F) continuous service temperature as a standalone coating.
As a top coat onto Sikafloor® NA PurCem® mortars, please refer to the most recent specific mortar Product Data Sheet.
Softening Point
~130 °C (~266 °F)
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®-31 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®-31 NA PurCem® surface post application.
Pot Life
~20 minutes
Curing Time
| at 20 °C (68 °F) and 50 % R.H. |
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®-31 NA PurCem® 1 x 5.52 kg mix (12.16 lb mix) consisting of:
1 Part A foil pouch + 1 Part B foil pouch + 1 Part C plastic pail
~15.3 m2 per 5.52 kg mix (~165 ft2 per 12.16 lb mix) at 10 mils w.f.t. per coat
NOTE: A Sikafloor®-31 NA PurCem® 44.16 kg (97.35 lb) unit will produce
8 x 5.52 kg (12.16 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.
Pre-agitate Components A and B separately, making sure all solids, including pigments, are uniformly distributed. Empty Component A into a clean pail and gradually add Component C (powder), mix for at least one (1) minute until all powders are wetted out. Mix at low speed (300 - 450 rpm) using a drill fitted with an Exomixer®-type mixing paddle (recommended) suited to the size of mixing container to minimize air entrapment. Add Component B and mix all ingredients continuously and thoroughly for three (3) minutes. During the blending operations and observing good safety practices, ie turning off and removing revolving parts, scrape down the sides and bottom of the 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.
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.).
Standalone Coating
Apply two (2) coats of Sikafloor®-31 NA PurCem® at 10 mil w.f.t. per coat to the substrate using a short or medium nap roller. Work the resin well into the surface, making sure the floor is fully wetted and then pull back lightly with the roller to the required thickness.
Broadcast Textured Coating
Apply a body coat of Sikafloor®-31 NA PurCem® at a thickness of 10 mil w.f.t., immediately broadcast the wet coating to rejection with mineral aggregates (selected for texture). Once the broadcast body coat has dried sufficiently to allow foot traffic, sweep-up and vacuum the loose unbonded aggregate. Apply a top coat at a thickness of 10 mil w.f.t.using a squeegee followed by backrolling to provide a uniform texture and finish.
System Top Coat
Where a broadcast Sikafloor®-19 NA, -20 NA -22 NA & 24 NA PurCem® systems has been installed, and a top coat is required, apply a single coat at 10 mil w.f.t using a short nap roller and back roll to encapsulate the aggregate and seal the surface.
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.
