Product Data Sheet
|07 16 13||DATA SHEET NO. 8138-115|
CEM-KOTE™ FLEX CR
Flexible, Hydrogen Sulfide Resistant, Cementitious Waterproofing
- Excellent resistance to sulfuric acid generated from hydrogen sulfide
- Good chemical resistance
- Long term crack resistance
- Superior freeze/thaw resistance
- Excellent bond to clean substrate
- Very low shrinkage
- Vermin proof
- Easy application
CEM-KOTE FLEX CR is primarily designed for waterproofing and protection of concrete structures exposed to sulfuric acid, generated by micro-biological oxidation of hydrogen sulfide. This includes concrete structures in waste water treatment facilities, such as digesters, sludge tanks, clarifiers, manholes, and sewer systems. It is also used in waterproofing and restoration of concrete structures in thin sections, where superior flexibility, chemical resistance, and breathability are required. It protects and waterproofs structures subjected to various chemicals, such as concrete floors, tanks, and secondary containment structures. It also acts as excellent protection for concrete against carbonation.
Composition and Materials
CEM-KOTE FLEX CR is a highly flexible, fibre-reinforced, hydraulic cement based material. It is a two-component system consisting of dry Component A and liquid Component B. For additional tensile strength, it may be reinforced with REINFORCING FABRIC HD.
Do not apply CEM-KOTE FLEX CR when the temperature is expected to be below 4°C within 48 hours or when rain is imminent. Follow hot weather concreting procedures when applying CEM-KOTE FLEX CR at temperatures exceeding 25° C. Not designed for heavy traffic areas.
Health and Safety
CEM-KOTE FLEX CR is non-toxic. Your skin might be sensitive to hydraulic cement or the liquid additive. We recommend use of rubber gloves. Avoid contact with eyes and prolonged contact with skin. If contact occurs, flush immediately with water. Seek medical advice if irritation occurs. Harmful if digested. Keep product out of reach of children. FOR INDUSTRIAL USE ONLY. Consult MSDS for additional information.
CEM-KOTE FLEX CR dry Component A is packaged in 16 kg bags and liquid Component B is packaged in 4.9 L plastic jugs.
CEM-KOTE FLEX CR yields 10.4 L (0.37 ft.³) and covers approximately 6.5 m² @ 1.6 mm (73.6 ft.² @ 60 mils) thickness per kit, applied in two (2) coats. The actual coverage will depend on surface roughness and the thickness applied. The applicator must carry out a sample application to determine the actual coverage for the given substrate and application thickness.
Storage and Transportation
When stored in a dry area, the material has a shelf life of 12 months. The liquid Component B must not freeze.
|Salt Scaling Resistance ASTM 672||Excellent|
|Chemical Resistance||Available on request|
|CEM-KOTE FLEX CR exhibits a high resistance to a majority of mineral acids in moderate concentrations for shorter periods of time. It is highly resistant to concentrated salt solutions and caustic environments.|
Current guide specification and application instructions contain additional information specific to each application and must be followed. Consult GEMITE or W. R. MEADOWS Technical Service to ensure correct surface preparation, application procedures, and chemical compatibility for your application.
Surface Preparation … Remove all deteriorated and loose concrete, form release agents, oil, grease, laitance, dust, dirt, and efflorescence by dry or wet sandblast or shotblast to achieve a concrete surface profile (CSP) of CSP 3 as per the International Concrete Repair Institute (ICRI). Repair deeper areas using GEM-PLAST TC or FIBRE-PATCH OV. The proper surface preparation is essential for a successful waterproofing using CEM-KOTE FLEX CR.
Reinforcing Steel … Remove all loose rust from any exposed reinforcing steel and apply two coats of PATCH-PRIME™ rustproofing from W. R. MEADOWS.
Crack Treatment … All cracks must be treated using CEM-KOTE FLEX CR and REINFORCING FABRIC NW. Pre-fill any cracks larger than 2 mm (80 mils) with CEM-KOTE FLEX CR. Apply a thin coat of CEM-KOTE FLEX CR 15 – 25 cm (6 – 10″) wide over the crack. Embed a strip of REINFORCING FABRIC NW into the wet CEM-KOTE FLEX CR and apply a second coat to fully cover REINFORCING FABRIC NW. Note: In some applications, REINFORCING FABRIC HD may be used throughout the entire CEM-KOTE FLEX CR layer. Please contact GEMITE or W. R. MEADOWS technical services for further information.
Mixing … Thoroughly mix the liquid Component B prior to use. Use a clean paddle, helix mortar mixer, or heavy-duty drill (400-600 rpm) with a mixing paddle. Pour approximately 80% of the Component B into the mixer and gradually add the dry material into the liquid and mix until a smooth and lump-free mix is obtained. Add the remaining liquid as required for a given application consistency. A small amount of water can be added, if required, at higher ambient temperatures.
Application … Apply CEM-KOTE FLEX CR to a saturated surface dry or saturated surface damp surface. Trowel or brush apply two coats to build a 1.6 – 3 mm (63 – 120 mils) thick layer of CEM-KOTE FLEX CR. It can also be spray applied using a hopper gun or positive displacement (moyno or carrousel) pump with a suitable plastering spray nozzle.
The second coat must be applied into a wet first coat, usually with 10 – 15 minutes, depending on temperature and relative humidity. The delayed application of the second coat could result in its de-bonding
Reinforcing Fabric … When using REINFORCING FABRIC HD throughout the entire area, apply first a thin layer of CEM-KOTE FLEX CR by brushing or spraying. When spraying, brush each coat to eliminate all “pinholes.” Embed REINFORCING FABRIC HD into the first coat and follow with the second coat. REIFORCING FABRIC HD must be fully covered. The total applied thickness of CEM-KOTE FLEX CR, including the REINFORCING FABRIC HD, should be 2 mm (80 mils).
In some new construction projects where REINFORCING FABRIC HD is considered to be used throughout, the fabric may be replaced with a 1 mm thick coat of CEM-KOTE FLEX PLUS. In such cases, only one coat of CEM-KOTE FLEX CR (1.0 mm thick) is needed on top of the CEM-KOTE FLEX PLUS layer. Please contact GEMITE or W. R. MEADOWS technical service for further information.
Curing … Cure CEM-KOTE FLEX CR by air-drying for a minimum of three days prior to continuous exposure to water. Protect fresh applications from rain, strong wind, and intense sunlight for 12 hours. When working under tarps at freezing temperatures, use electrical heaters to prevent “carbonation” of the material.
Cleanup … All tools must be cleaned with water immediately after use. Cured material must be removed mechanically.
MASTERFORMAT NUMBER AND TITLE
07 16 13 – Polymer Modified Cement Waterproofing
May help contribute to LEED credits:
- IEQ Credit 3.1: Construction Indoor Air Quality Management Plan: During Construction
- MR Credit 2: Construction Waste Management
- MR Credit 5: Regional Materials
Some maintenance may be required depending upon the type of chemical environment and the length of exposure.
A limited twelve (12) month Material Replacement Warranty is available. For details, contact Technical Service.
For technical advice on suitability of CEM-KOTE FLEX CR for a specific application, specification assistance and application advice, contact Technical Service at 1-800-563-3618.
The surfacing will be CEM-KOTE FLEX CR, highly elastomeric, fibre reinforced and polymer modified cement manufactured by Gemite® Products Inc. (905-672-2020). It will be mixed and applied according to manufacturer’s specifications and recommendations. The suitability of CEM-KOTE FLEX CR for each use and the surface preparation method must be checked with Technical Service before starting each project.
Gemite® Products Inc.
1787 Drew Road
Mississauga, ON L5S 1J5