Sikafloor® Duochem-942

Sikafloor® Duochem-942 is a two-component, water-clear or pigmented, smooth aliphatic urethane coating specifically formulated to provide abrasion and UV-resistance to floors and walls.

Sikafloor® Duochem-942 water-clear is available in three gloss levels: matte, satin and gloss. While Sikafloor® Duochem-942 Pigmented is simply available in gloss finish.

Recommended uses

Sikafloor® Duochem-942 is suitable for a wide range of applications requiring outstanding protective properties, including resistance to abrasion and corrosive environments. For applications where a high-gloss finish, exhibiting excellent clarity or colour retention is needed. As an abrasion resistant and high gloss, easy to clean wall coating (consult Sika Canada for guidance). As a decorative, thin-film sealer on concrete, well prepared steel, most hardwood floors and properly prepared existing epoxy floor surfaces to improve gloss and colour retention and long-term wear resistance.

Features

• Enhanced stain-resistance
• Forms hard yet flexible film
• Provides improved impact-resistance
• High resistance to abrasion and wear
• Convenient 2 : 1 mixing ratio
• Good chemical-resistance, especially within corrosive environments
• Gloss retention in clear and coloured versions
• Easy to clean and maintain
• Resistant to UV, non-yellowing
• Excellent hiding properties in pigmented version

Packaging

Components A+B: 11.34 L (3 US gal) Component A: 7.56 L (2 US gal) Component B: 3.78 L  (1 US gal)

APPROVALS / CERTIFICATES

Meets the requirements of CFIA for use in food plants CAN/ULC S102.2: Standard test method for determining the surface burning characteristics of flooring materials. ▪ Flame Spread Index (FSI): 0 ▪ Smoke Developed Index (SDI): 30

Shelf Life

Gloss: 6 months in original, unopened packaging Satin & matte: 3 months in original, unopened packaging.

Storage Conditions

Store in a dry place, protected from freezing at a temperature between 5 °C and 32 °C (41 °F and 90 °F).  Protect from freezing. If Sikafloor® Duochem-942 has frozen, contact Sika Canada.

Volatile organic compound (VOC) content

< 240 g/L

Viscosity

A+B (Clear): ~240 cPs

Solid content by volume

Clear ~60 % Pigmented ~65 % (dependent upon colour)

Abrasion Resistance

~0.08 g loss: CS-17 wheel / 1000 g / 1000 cycles (ASTM D4060)

Tensile Strength

~37.2 MPa (~5400 psi) (ASTM D638) Type IV

Pull-Off Strength

> 2.7 MPa (> 400 psi) (concrete failure) (ASTM D7234) (concrete epoxy sealed)

Chemical Resistance

Contact Sika Canada®

Permeability to Water Vapour

~0.48 g/h/m 2 (ASTM E96) Water procedure B / Film 0.01 cm (0.004”) Permeance: ~1 perm (ASTM E96) Water procedure B

Coefficient of Friction

~0.23 Wet (smooth high gloss) ~0.97 Dry (smooth high gloss) ~0.47 Wet (optional Sikafloor® 4 Texture - ceramic spherical wear aggregate) ANSI A326.3 BOT 3000e

Mixing Ratio

A:B = 2:1 by volume

Product Temperature

Condition product between 18 °C to 30 °C (65 °F to 86 °F) before using.

Ambient Air Temperature

Minimum 16 °C (61 °F)  Maximum 30 °C (85 °F) Note: Mixing carried out under conditions where the Sikafloor® Duochem-942 temperature and ambient temperature are below 18°C (65°F) will result in reduced product workability and slower curing rates.

Relative Air Humidity

Maximum 75 % (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: 16 °C (61 °F) / Maximum: 30 °C (86 °F) Note: Any attempt to apply Sikafloor® Duochem-942 at substrate temperature conditions less than 18 °C (65 °F) will result in an increase in viscosity and slower cure rates.

Substrate Moisture Content

Moisture content of concrete substrate must be ≤ 4 % by mass (pbw – part by weight) as measured with a Tramex® CME/CMExpert type concrete moisture meter.

Pot Life

~2 hours at 21 °C (70 °F)

Curing Time

Tack-free ~2 hours Foot traffic ~24 hours Full cure ~5 days to ~7 days

Waiting Time / Overcoating

20 °C (68 °F) Minimum ~8 hours Maximum 48 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 microfibre 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.

Consumption

Primer: Sikafloor® Duochem-9205 applied at a rate of 4 m 2 /L (165 ft 2 /US gal.) at 10 mil d.f.t. per coat. Finish Coat: Sikafloor® Duochem-942 applied at a rate of 9.5 to 10 m 2 /L (385 to 405 ft 2 /US gal.) at 4 mil w.f.t. / 2.3 mil d.f.t. per coat. Note: Two (2) coats are recommended. Important: Actual coverage rates and material consumption will depend upon porosity and profile of substrates. Allowance must also be made for variation in film thickness or number of coats required to achieve opacity with light (i.e., white) or bright colours (i.e., reds and yellows) and dark substrates. Test sections are recommended to establish correct coverage.

APPLICATION INSTRUCTIONS

SURFACE PREPARATION The concrete surface must be dry, clean and sound. Remove any dust, laitance, oil, dirt, curing agent, impregnations, wax, foreign matter, coatings and disintegrated material from the surface by any appropriate mechanical means, in order to achieve a profile equivalent to ICRI / CSP 3 - 4 for floors or ICRI / CSP 2 - 3 for walls. The compressive strength of the substrate should be at least 25 MPa (3625 psi) at 28 days and at least 1.5 MPa (218 psi) in tension at the time of application of the Sikafloor® Duochem-9205 (Primer) or epoxy floor coatings. Epoxy or polyurethane coatings that have exceeded their overcoating time must be sanded and wiped with a solvent-moistened rag prior to Sikafloor® Duochem-942 application

SUBSTRATE QUALITY

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. 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 Sikafloor® Duochem-942.

APPLICATION

Primer coat: Apply Sikafloor® 1620 (clear coating) or Sikafloor® 26 CA (pigmented coating) over the slab as a primer coat using a notched squeegee and/or roller at a uniform coverage rate of approximately 4 m 2 /L (165 ft 2 /US gal) without ponding. Allow the primer to cure for 12 hours at 23 °C (73 °F) before applying Sikafloor® Duochem-942. Finish Coat: Sikafloor® Duochem-942 may be applied using conventional or airless spray, high quality, short nap rollers (lint-free), natural bristled brush or squeegee and backrolled. Waiting time between coats will be approximately 8 hours to 24 hours dependent upon temperatures.

CLEAN UP

Clean all tools and equipment with a non-flammable solvent. Once hardened, product can only be removed mechanically.

Cure time

Tack-free ~2 hours Foot traffic ~24 hours Full cure ~5 days to ~7 days

Application temperature

Minimum 16 °C (61 °F) Maximum 30 °C (85 °F)

VOC

< 240 g/L