Product Data Sheet
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Sikafloor®-31 NA PurCem®

Sikafloor®-31 NA PurCem®

SOLVENT FREE HIGH BUILD, CEMENTITIOUS URETHANE COATING

Sikafloor®-31 NA PurCem® is a three-component, pigmented, matte finish coating based on the unique Sikafloor PurCem water dispersed polyurethane/cement and aggregate technology. Typically installed as a primer and topcoat for Sikafloor PurCem systems. Can also be used as a stand alone coating on concrete surfaces.It provides an economical solution that has excellent chemical resistance properties and very good durability against abrasion and mechanical damage. System can be installed to 15 to 20 mils (0.4 to 0.5 mm) per coat.

  • Can be applied on green concrete, typically 7-10 days. Full 28 days cure time is not necessary.
  • Can be applied over partially cured concrete substrates (> 4% mass (pbw –part by weight) as measured with Tramex® CME/CMExpert type concrete moisture meter surface moisture).
  • Can be applied to concrete substrates where <100 % relative humidity is measured as per ASTM F2170.
  • 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 -31 NA Purcem (FS) Chemical Resistance Chart.
  • Similar coefficient of thermal expansion to concrete allowing movement with the substrate through     normal thermal cycling. It will perform and retain its physical characteristics through a wide temperature range from -40 °F (-40 °C) up to 248 °F (120 °C).
  • Non-tainting, odorless.
  • Good wear resistance from a two coat application, if used as a stand-alone coating.
  • Behaves plastically under impact / deforms but will not crack or debond.
  • High abrasion qualities result from its aggregate structure.
  • Extra Expansion joints are not necessary; maintain and extend existing expansion joints up through the Sikafloor PurCem Flooring System.
  • Minimal maintenance costs, superior life cycle cost advantage versus tile.
  • Meets the requirements of USDA for use in food plants.
 
Product Data Sheet
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Usage

  • As a primer, high build coating and finish coat for PurCem products.
  • As a chemical resistant concrete coating.
  • Typically used in food processing plants, chemical storage areas, warehouses, washrooms, laboratories, food preparation areas and chemical process plants.
 

Advantages

  • Can be applied on green concrete, typically 7-10 days. Full 28 days cure time is not necessary.
  • Can be applied over partially cured concrete substrates (> 4% mass (pbw –part by weight) as measured with Tramex® CME/CMExpert type concrete moisture meter surface moisture).
  • Can be applied to concrete substrates where <100 % relative humidity is measured as per ASTM F2170.
  • 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 -31 NA Purcem (FS) Chemical Resistance Chart.
  • Similar coefficient of thermal expansion to concrete allowing movement with the substrate through     normal thermal cycling. It will perform and retain its physical characteristics through a wide temperature range from -40 °F (-40 °C) up to 248 °F (120 °C).
  • Non-tainting, odorless.
  • Good wear resistance from a two coat application, if used as a stand-alone coating.
  • Behaves plastically under impact / deforms but will not crack or debond.
  • High abrasion qualities result from its aggregate structure.
  • Extra Expansion joints are not necessary; maintain and extend existing expansion joints up through the Sikafloor PurCem Flooring System.
  • Minimal maintenance costs, superior life cycle cost advantage versus tile.
  • Meets the requirements of USDA for use in food plants.
 

Packaging

Component A:

1 US gal (3.78 L) 8.53 lb (3.87 kg)

Component B:

0.7 US gal (2.64 L) 7.33 lb (3.325 kg)

Component C:1 US gal (3.78 L) 8.53 lb (3.87 kg)

Components A+B+C:

A+B+C: 24.38 lb (11.06 kg)

Color

RAL 7012 Basalt Gray 

RAL 7038 Agate Gray

RAL 7042 Traffic Grey

RAL 3009 Oxide Red

RAL 1001 Beige

Product Details

Product Information

Shelf Life

Components A+B: 1 year in original unopened packaging Component C: 6 months in original unopened packaging.

Storage Conditions

Store dry between 50°- 77°F (10°- 25°C). Protect from  freezing .

Density

11.68 lb/US gal. (1.40 kg/L)

ASTM C905 

at 73°F (23°C) and 50% R.H.

Volatile organic compound (VOC) content

5 g/L

Components A+B+C 
Technical Information

Shore D Hardness

80

ASTM D2240

at 73°F (23°C) and 50% R.H

Abrasion Resistance

S-17/1,000 cycles/1,000 g   -0.10 g los

H-22/1,000 cycles/1,000 g   -1.57 g loss

ASTM D4060

at 73°F (23°C) and 50% R.H

Impact Strength

1.67 ft-lb (2.27 joules)

ASTM D2794

at 73°F (23°C) and 50% R.H

Indentation

~ 0%

 MIL -PRF -24613

at 73°F (23°C) and 50% R.H.

Flexural Strength

3,582 psi (24.7 MPa)           

ASTM C580

at 73°F (23°C) and 50% R.H.

Thermal Compatibility Pass

ASTM C884

at 73°F (23°C) and 50% R.H

Tensile Strength

1,552 psi (10.7 MPa

ASTM C307

at 73°F (23°C) and 50% R.H.

Softening point

266°F (130°C)

at 73°F (23°C) and 50% R.H.
 

Water Absorption

0.07%

ASTM C 413

at 73°F (23°C) and 50% R.H

Chemical Resistance

Please consult Sikafloor Technical Services.

Microbiological Resistance

Resistance to Fungi Growth Rated 0

(no growth)

ASTM G21

at 73°F (23°C) and 50% R.H  

Resistance to Mold Growth Rated 10

(highest resistance)

ASTM D3273

at 73°F (23°C) and 50% R.H

Application

Application Information

Mixing Ratio

Components A : B : C = Mix full units only

Ambient Air Temperature

Minimum/Maximum 40˚/85˚F (4˚/30˚C).

Substrate Temperature

Minimum/Maximum 40˚/85˚F (4˚/30˚C).

Pot Life

Material Temperature 

Time

+50°F (10°C)

~30-35 minutes

+68°F (20°C) ~20-25 minutes

+86°F (30°C)  

~10-15 minutes

Cure Time

Temperature:

 Foot traffic  

Light traffic

Full cure

+50°F (10°C)

~24 hours

~6 days

~10 days

+68°F (20°C)~12 hours~4 days~7 days

+86°F (30°C)

~6 hours

~2 days

~5 days

Waiting / Recoat Times

Before applying Sikafloor®-31 NA PurCem® when a scratch primer and sealer coat is used allow:

Ambient & Substrate Temperature

Minimum

Maximum

+50°F (10°C)~24 hours~7 days

+68°F (20°C)

~12 hours

~72 hours

+86°F (30°C)

~6 hours

~48 hours
Consumption

Coverage

Approx. 168 ft2 (15.6 m2) per unit at 20 mils (0.5.mm)

Approx. 244 ft2 (20.8 m2) per unit at 15 mils(0.4 mm)

(The above figures do not allow for surface porosity, profile or waste).

Application steps

MIXING

Mix Ratio: Components A : B : C = Mix full units only
Mixing will be affected by temperature; condition materials for use to 65 - 75º F (18 - 24º C).
Premix Component A, make sure all pigment is evenly distributed. Empty component A into a clean pail, gradually add component C (powder) while mixing at low speed for 60-90 seconds and until all powders are wetted out.  Gradually add component B (hardener) to the thoroughly mixed A and C parts and mix all components continuously and thoroughly for 3 minutes and until uniform. 

During the mixing operations, scrape down the sides and bottom of the container with a flat or straight edge trowel at least once to ensure complete mixing (Components A+B+C). Do not mix more material than can be applied within the working time limits (i.e. Pot Life) at the actual field temperature.

APPLICATION

Smooth coating

Apply one to two coats of Sikafloor-31NA PurCem to the substrate using a flat squeegee, spread evenly and back roll using a 3/8” nap roller, to required thickness

      
Slip-resistance top coat

Apply a single coat at 15-20 mils (0.4-0.5 mm) using a 3/8” nap roller, lightly broadcast with selected mineral aggregates (selected for texture) and back roll to encapsulate the aggregate.

    
Slip-resistant broadcast coating

Apply a body coat of Sikafloor-31NA PurCem at a thickness of 15-20 mils (0.4-0.5 mm), immediately broadcast the wet coating to rejection with selected mineral aggregates (selected for texture). Once the broadcast body coat has cured sufficiently to allow foot traffic, sweep and vacuum the loose unbonded aggregate. Apply a top coat at a thickness of 15-20 mils using a squeegee followed by backrolling to provide a uniform texture and finish.

                      
Maintain a ‘wet-edge’ to avoid lap marks. Over- rolling and delays in the installation of mixed material may cause inconsistencies with visible lap marks in the finished floor. Beware of accelerated cure rates when applying at elevated substrate and ambient temperatures.
Maintain consistent thickness throughout the entire area. Gloss levels and visual appearance may vary depending on thickness of material applied.

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