Sikafloor®-20 NA PurCem®

Sikafloor®-20 NA PurCem® is a state-of the-art, easy to trowel, 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®-20 NA PurCem® has a resin rich textured aggregate surface that provides good traction. Selected aggregate can be broadcast onto the wet screed to increase the surface texture for improved traction. Sikafloor®-20 NA PurCem® represents superior polyurethane/cement technology, combining easier application, resistance to blistering and improved performance.

Recommended uses

Sikafloor®-20 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.

Features

• 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 Canada for full details. Refer to the Sikafloor®-20 NA 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 -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; simply maintain and extend existing expansion joints up through the Sikafloor® PurCem® Flooring System.
• Achieves highest performance ratings according to ASTM G21 resistance to fungi and ASTM D3273 resistance to mould growth.

Packaging

166.24 kg (366.5 lb) - 79.92 L (17.58 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 17.19 kg (37.90 lb) multi-wall paper bags. NOTE: A 166.24 kg (366.5 lb) unit will produce 8 x 20.78 kg (45.81 lb) mixes

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

~2.08 kg/L  (~17.34 lb./US gal.) (ASTM C905)

Volatile organic compound (VOC) content

A+B+C = ~5 g/L

Shore D Hardness

~81 (ASTM D2240)

Abrasion Resistance

~0.24 g (~0.008 oz) CS-17 / 1000 cycles / 1000 g (2.2 lb) ~1.96 g (~0.069 oz)   H-22 / 1000 cycles / 1000 g (2.2 lb) (ASTM D4060)

Indentation

~0% (MIL-PRF-24613)

Compressive Strength

24 hours ~25 MPa  (~3626 psi) 3 days ~32 MPa  (~4641 psi) 7 days ~34 MPa  (~4931 psi) 28 days ~37 Mpa  (~5367 psi) (ASTM C579)

Tensile Strength in Flexure

~11 MPa  (~1595 psi) (ASTM C580)

Modulus of Elasticity in Flexure

~1685 MPa  (~244 442 psi) (ASTM C580)

Tensile Strength

~4.3 MPa  (~624 psi) (ASTM C307)

Pull-Off Strength

> 3.0 MPa  (> 435 psi) (substrate failure) (ASTM D7234)

Shrinkage

~0.146% (ASTM C531)

Coefficient of Thermal Expansion

~2.8 x 10 -5 mm/mm/°C  (~1.56 x 10 -5 in/in/°F) (ASTM D696)

Skid / Slip Resistance

~0.62 wet (trowel & backroll 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

~0.73% (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)

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®-20 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®-20 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 at 20 °C (68 °F) and 50 % R.H. 6 mm (1/4 in) 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®-20 NA PurCem® 1 x 20.78 kg mix (45.81 lb mix) consisting of: 1 Part A foil pouch + 1 Part B foil pouch + 1 Part C multi-wall paper bag ~1.6 m 2 per 20.78 kg mix (~17 ft 2 per 45.81 lb mix) at 6 mm (1/4 in) w.f.t. ~1.0 m 2 per 20.78 kg mix (~11 ft 2 per 45.81 lb mix) at 9 mm (3/8 in) w.f.t. NOTE: A Sikafloor®-20 NA PurCem® 166.24 kg (366.50 lb) unit will produce 8 x 20.78 kg (45.81 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.

CLEAN UP

Clean all tools and equipment with Sika® Urethane Thinner and Cleaner. Once hardened, product can only be removed mechanically.

Cure time

Foot traffic ~18 hours at 20 °C (68 °F) Light traffic ~24 hours and 50 % R.H. Normal traffic (full cure) ~5 days 6 mm (1/4 in)

Application temperature

Minimum 7 °C (45 °F) / Maximum 38 °C (100 °F)