Sikagard® CRV-20

Component A - six months ; component B - 24 months: in original, undamaged and unopened packaging.

Store dry between 5 °C and 32 °C (41 °F and 89 °F) off the ground on pallets or similar. Protect from freezing. If Sikagard® CRV-20 has frozen, contact Sika Canada.  

A+B = ~1.08 kg/L (~9.0 lb/US gal)  

≤ 60 g/L

A+B: ~500 cPs

Tensile Modulus:

Consult Sika Canada

Heat Distortion Temperature: 

Condition product at temperatures between 18 °C and 24 °C (65 °F to 75 °F) before using and during the application.

Minimum: 15 °C (59 °F) /  Maximum: 30 °C (86 °F)

Note: Mixing carried out under conditions where the Sikagard® CRV-20 temperature and ambient temperature are below 18°C (65°F) will result in reduced product workability and slower curing rates.
 

Maximum 85 % (during application and cure)

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.

Minimum: 15 °C (59 °F) / Maximum: 30 °C (86 °F)

Note: Any attempt to apply Sikagard® CRV-20 at substrate temperature conditions less than 18 °C (65 °F) will result in an increase in viscosity and slower cure rates.
 

Moisture content of a concrete substrate at the time of application of Sikagard® WDE Primer must be < 6 % (pbw-part by weight) as measured with a Tramex® CME/CM Expert type concrete moisture meter on mechanically prepared surface according to this product data sheet (preparation to ICRI / CSP 3 - 4).

NOTE:  Vinyl Ester materials do not bond well to damp substrates. Sikagard® CRV-20 must be applied over a concrete substrate primed with Sikagard® WDE Primer as recommended in the “APPLICATION” section (on page 6 of this document).

~10 minutes  (Novolac Vinyl Ester Resin + Benzoyl Peroxide Powder)

Notes:

• Curing time will vary according to air and substrate temperatures and relative humidity.
• Freshly applied material should be protected from dampness, condensation and water for at least 24 hours.

IMPORTANT: If the maximum waiting time has been exceeded. The previous coat must be lightly sanded, to remove all gloss; vacuum cleaning using a brush attachment followed promptly with a solvent wipe off the surface as per the following generally accepted practices:

• Avoid using solvent that can leave a oily residue: (such as, but not limited to most mineral spirit).
• Avoid Paper Towels: Pre-treated shop towels or standard paper towels may contain silicone or manufacturing additives that will ruin your paint job. Stick to lint-free cotton cloths or dedicated microfiber towels.   
• Change Rags Frequently: As soon as a rag becomes visibly dirty, discard it or fold it to a clean side. Continuing to wipe with a saturated, dirty rag just re-deposits contaminants onto the surface.    
• Wet Wipe: Pour a solvent (onto the first rag. Do not dip the rag into the solvent container; pour it directly to keep your supply clean).   
• Lift: Wipe down a small, manageable section (e.g., ~0.5 m² [~ 4-6 ft²]) of the surface. Use enough pressure to break up and lift the oils or sanding dust. Rotate the cloth frequently so you are always using a clean spot.  
• Dry Wipe: Before the solvent can flash off (evaporate) and dry on the surface, wipe the same section with a second, clean, lint-free rag. When used correctly, this second cloth absorbs residual solvent and removes materials that could reduce or prevent adhesion or the proper performance of the next coat.

Yield

Concrete Substrates / Smooth Coating:

Maximum build per coat for Sikagard® CRV-20 on vertical surfaces is 10 mil wft. Three coats may be required to produce a smooth coating vertically.

Concrete Substrates / Broadcast Build-Up Surfacing:

Steel Substrates / Smooth Coating:

Maximum build per coat for Sikagard® CRV-20 on vertical surfaces is 10 mil. Three coats may be required to produce a smooth coating vertically.

Steel Substrates / Broadcast Build-up Surfacing:

NOTE: Sikagard^® WDE Prime Coat shown below is only required on steel substrates to produce a thicker wear coarse layer in areas subject to heavy traffic.

Concrete surfaces must be clean and sound. The compressive strength of the concrete substrate should be at least 25 MPa (3625 psi) at 28 days and a minimum of 1.5 MPa (217 psi) in tensile strength, at the time of the application of Sikagard^® WDE Primer and Sikagard® CRV-20.

Substrates must be free of contaminants such as dust, dirt, existing paint films, efflorescence, exudates, laitance, form, hydraulic or fuel oils, brake fluid, grease, fungi, mildew, biological residues or any other contaminants which may prohibit good bond or conditions of the substrate that may reduce the overall performances of Sikagard® CRV-20.

IMPORTANT:

• Do not hand mix Sikagard® CRV-20. Mechanically mix only.  
• Only mix full units because it is difficult to accurately split into smaller quantities.

Pre-stir Components A and B separately, making sure all solids, are evenly distributed and do not allow mixed material to stand and settle. Empty Component B into Component A (Resin) while mixing. Blend the combined components thoroughly at low speed (300 - 450 rpm) for at least one (1) minute using a drill fitted with an Exomixer® or Jiffy type paddle suited to the dimensions of the mixing container and keep the mixing paddle in the mix to avoid entrapping air. Take care not to introduce any air bubbles while mixing. Make sure the contents are completely mixed to avoid any weak or partially cured spots in the coating. During the mixing operation, scrape down the sides and bottom of the container with a flat or straight edge trowel at least once to ensure complete mixing. 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. When completely mixed,Sikagard® CRV-20 should be uniform in appearance and consistency.

Note: Do not mix more material than can be applied within the working time limits (i.e. Pot Life) at the actual field temperature.

See “Yield Section” of this Product Data Sheet for specific application thickness and number of coats recommended.

Concrete Substrates / Smooth Coating: This provides a smooth, easy-to-maintain system.

Primer Coat: Apply Sikagard^® WDE Primer onto concrete substrate using a brush, roller or squeegee to a uniform coverage without ponding. Allow primer to cure for a minimum of 6 hours at 20 °C (68 °F) or 10 hours at 10 °C (50 °F) before over-coating with Sikagard® CRV-20.
1st Coat: Once the Sikagard^® WDE Primer has cured, apply Sikagard® CRV-20 using a brush, roller or squeegee to a uniform coverage without ponding.
2nd Coat: Once 1st coat is tack-free, apply a second coat of Sikagard® CRV-20 using a brush, roller or squeegee to a uniform coverage without ponding.

NOTE: If over-coating of Sikagard^® WDE Primer with Sikagard® CRV-20 is attempted before the necessary curing-time has elapsed, the reactive components in the Sikagard® CRV-20 will act as a solvent, softening the Sikagard^® WDE Primer, retarding or stopping the cure of the Sikagard® CRV-20.

Concrete Substrates / Broadcast Build-up Surfacing: This method produces a durable, textured, slip-resistant, improved traction finish.

Primer Coat: Apply Sikagard^® WDE Primer onto concrete substrate using a brush, roller or squeegee to a uniform coverage without ponding. Broadcast the selected aggregate (selected for texture) into the wet primer to rejection.
Broadcast Coat: Once the primer coat has sufficiently cured to allow foot-traffic, sweep-up and vacuum the loose, unbonded aggregate. Apply the broadcast coat of Sikagard® CRV-20 using a notched squeegee or trowel and backroll to a uniform coverage. Broadcast the selected aggregate (selected for texture) into the wet resin to rejection.
Top Coat: Once the broadcast coat has sufficiently cured to allow foot-traffic, sweep-up and vacuum the loose unbonded aggregate. Apply the top coat of Sikagard® CRV-20 using a squeegee, followed by back rolling to provide a uniform texture and finish.

Steel Substrates:
Consolidation and sealing of common steel substrates with Sikagard® WDE Primer is not usually required under typical circumstances. However, due to variations in steel quality, surface condition, surface preparation and ambient conditions, reference test areas are recommended to determine whether priming is required to prevent the possibility of debonding, blisters, pin-holes or other defects. Contact Canada. Application of Sikagard® CRV-20 over properly-prepared steel surfaces is typically the same procedure as outlined above for both Smooth Coating and Broadcast Build up Surfacing over concrete substrates, excluding the use of Sikagard^® WDE primer, unless a thicker wear coarse layer is required to resist heavy traffic.

See “Consumption” section of this Product Data Sheet above for specific application thickness and number of coats recommended.

IMPORTANT INSTALLATION REQUIREMENTS!

1. Over-coating Sikagard® WDE Primer with Sikagard® CRV-20 attempted before the necessary curing-time has elapsed, will soften the Sikagard® WDE Primer, retarding or stopping the cure of the Sikagard® CRV-20.
2. Sikagard® CRV-20, will not cure properly in the presence of styrene vapours given off during initial cure. To achieve proper cure, a small amount of air movement causing a fresh air exchange and displacing the styrene vapours is mandatory.
3. Sikagard® CRV-20, will not cure uniformly when applied at less than 10 mil w.f.t. per coat.
4. Sikagard® CRV-20 is very fast curing. Do not over work the surface during application.
5. Due care should be exercised during application and initial cure as the product is flammable; users should refer to the most recent SAFETY DATA SHEET for advice on the safe handling, storage and disposal.

For additional information, see Technical Bulletin - Sikagard® CRV-20 Properties and Application Guidelines.

Clean all tools and equipment immediately with a MIBK-based product. Once hardened, product can only be removed mechanically.