Chemical Resistant Coating - Sikagard® Duochem-7500

Chemical Resistant, Epoxy-Novolac Floor Coating, Topping or Containment Lining

Sikagard® Duochem-7500 is a two-component, high solids, epoxy-novolac coating/topping/ lining which possesses outstanding resistance to strong inorganic acids, concentrated sulfuric acid and oxygenated solvents.

• The material is convenient to proportion, 2:1 by volume, Component A to Component B ratio.
• Sikagard® Duochem-7500 may be applied as a smooth system or as a broadcast buildup system incorporating silica sand.
• Sikagard® Duochem-7500 provides a high build and effective barrier of protection for concrete and steel against a wide range of aggressive substances.
• Sikagard® Duochem-7500 exhibits excellent Adhesion, Hardness, Abrasion Resistance, and Compressive Strength values.
• The systems provide excellent protection for steel and concrete against a wide range of chemicals. See product specific Chemical Resistance Guide located on usa.sika.com or by contacting Sika Technical Services.

Usage

• As a smooth, chemical-resistant lining on concrete or steel substrates subject to concentrated acids.
• Protection of containment tanks, machine bases, plant floors and walls exposed to aggressive chemicals.
• As a broadcast, build-up system to provide a slip resistant and durable wearing surface in pedestrian areas where aggressive chemicals are present.

Advantages

• The material is convenient to proportion, 2:1 by volume, Component A to Component B ratio.
• Sikagard® Duochem-7500 may be applied as a smooth system or as a broadcast buildup system incorporating silica sand.
• Sikagard® Duochem-7500 provides a high build and effective barrier of protection for concrete and steel against a wide range of aggressive substances.
• Sikagard® Duochem-7500 exhibits excellent Adhesion, Hardness, Abrasion Resistance, and Compressive Strength values.
• The systems provide excellent protection for steel and concrete against a wide range of chemicals. See product specific Chemical Resistance Guide located on usa.sika.com or by contacting Sika Technical Services.

Packaging

3 gal. (11.34 L) unit

Color

RAL 7046 Tele Grey, RAL 3009 Oxide Red, Clear

Product Details

Product Information

24 months when stored in original, unopened packaging

Store dry between 41 °F and 90 °F (5-32 °C)

Approx. 96 %

Approx. 95 %

Technical Information

Application

Application Information

A:B= 2:1 by volume

8.8 oz. (250 g) Approx. 60 min

Minimum Dry to the Touch - Maximum 24 hours (at 73 °F (23 °C))

Consumption

106 ft²/gal. (2.6 m²/l) for neat application; 80 ft²/gal. (2 m²/l) for broadcast application

Application Steps

Thoroughly pre-mix each component separately to ensure that all solids are distributed throughout and components are consistent within themselves. Empty the complete contents of Component B into the partially filled Component A container. When mixing a partial unit, ensure that the components are proportioned in the correct ratio and empty both into a suitably sized, clean mixing vessel.

Mix the combined components for at least 3 minutes, using a low-speed drill (200-300 rpm) to minimize entrapping air. Use an Exomixer type or Jiffy mixing paddle (recommended model) suited to the volume of the mixing container. 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. When completely mixed, Sikagard® Duochem-7500 should be uniform in color and consistency. Mix only that quantity which can be used within its pot life.

Never use a thickening agent such as Sikafloor® Extender T, Cabosil or any other filler to increase product viscosity as this will greatly reduce chemical resistance.

Concrete:
Smooth Coating:
Primer Coat: Apply Sikadur® WDE Primer onto prepped concrete substrates using a brush, roller or squeegee to a uniform coverage without ponding. Refer to the current product data sheet for Sikadur® WDE Primer for published recommendations and further information.

1st Coat: Once the primer is tack free apply Sikagard® Duochem-7500 using a brush, roller or squeegee to a uniform coverage without ponding.
2nd Coat: Once first coat is tack free, apply a second coat of Sikagard® Duochem-7500 using a brush, roller or squeegee to a uniform coverage without ponding.

Broadcast Build-Up System:
Primer Coat: Apply Sikadur® WDE Primer onto prepped concrete substrates using a brush, roller or squeegee to a uniform coverage without ponding. Refer to the current product data sheet for Sikadur® WDE Primer for published recommendations and further information.

Broadcast Coat: Once the primer is tack free apply the broadcast coat of Sikagard® Duochem 7500 using a notched squeegee or trowel and backroll to a uniform coverage. Broadcast the selected sand (shape and size to be selected in accordance with required texture/slip resistance) into the wet resin to rejection.

Top Coat: Once the broadcast coat has sufficiently cured to allow foot traffic, sweep-up and vacuum-off all loose, unbounded sand. Apply the top coat of Sikagard® Duochem-7500 using a squeegee, followed by back rolling to provide a uniform texture and finish.

Steel: Priming, consolidation or sealing of common steel substrates with Sikadur® 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 issues with adhesion, compatibility, or other defects. Consult Sika Technical Services for advice.

Application of Sikagard® Duochem-7500 onto properly prepared steel surfaces is typically the same procedure as outlined above for smooth coatings and broadcast build-up systems onto concrete, excluding the use of Sikadur® WDE primer, unless determined otherwise.

See Typical Data section of this product data sheet above for coverage rates, specific application thicknesses and number of coats

recommended.

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