CHEMSPRAY™ 690
Pure polyurea, spray-applied waterproofing membrane
Product Description
Two-part, fast-curing, pure polyurea, spray-applied elastomeric coating. It provides a premium quality, high-build, long life protective coating to concrete & metal substrates on major civil, infrastructure and commercial construction projects. Formulated using the latest polyurea technology, it forms an impenetrable barrier that is resistant to water, chemicals, sewage and wear.
Product Advantages
- Simple application – fast cure
- Potable-water certified
- Suitable for continuous immersion
- Long-life – permanently flexible
- Abrasion and chemical resistance
- Total adhesion – no water tracking
- Resistant to sewage gases – H2S, H2SO4 etc
- Resists reflection cracking in concrete
- Suitable for continuous immersion in demineralised, fresh and salt waters plus desalination permeate
Uses
CHEMSPRAY™ 690 elastomer system is ideally suited for most areas of protective coating, lining and waterproofing in civil and commercial applications.
Used as a waterproof and highly chemical-resistant barrier on:
- Sewage and water treatment plants
- Desalination plants
- Potable-water containment
- Chlorinated swimming lagoons
- Tunnels
- Bridge-decks
- Chemical process facilities
It provides lasting protection to plant room floors, chemical storage and secondary containment areas.
Features
CHEMSPRAY™ 690 contains no TDI, MOCA, bitumen or tar-based compounds. Being polyurea, it has good resistance to humidity during application and forms a tough, bubble-free, impermeable coating.
CHEMSPRAY™ 690 is a simple 100:100 by volume mix ratio system that applies with good flow out and rapid cure, resulting in a smooth, even coating finish that can be walked on in seconds.
The cured elastomer has high substrate adhesion plus excellent resistance to tear, puncture, chemicals, water and abrasion. Unlike rigid coating materials such as epoxies, vinyl ester, etc., CHEMSPRAY™ 690 resists post-application reflection cracking in concrete substrates.
Surface Preparation
See project specific Application Method Statement for detailed requirements. Generally, for concrete substrates use wet, wet- abrasive or dry-abrasive blasting to remove laitance, etc. Patch defects using suitable fairing compound.
Fill all joints, cracks, gaps and form angle fillets in internal corners or penetrations with SILCOR® LM PU Sealant.
Blast or mechanically clean steel substrates to a 70 to 90µm surface profile or Class 2 1/2 white metal finish using Speed Blast Garnet, steel shot or similar media. Prime with EPOCOTE™ F100W at 0.3kg/ m2 or CHEMSPRAYTM Primer 117 at minimum 0.3 kg/m2 (0.3 litre/ m2) dependent on substrate condition. Allow to dry approximately 0.5 to 3 hours depending on ambient conditions and surface porosity.
Typical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Mix Ratio - Polyamine : Iso (by volume) | 100 : 100 | - |
| Polyamine Viscosity (@ 25ºC) | 400 - 1000 mPa.s | ASTM D2196 |
| Polyamine Specific Gravity (@ 25ºC) | 1.02 g/ml | ASTM D1475 |
| Isocyanate Viscosity (@ 25ºC) | 400 - 1000 mPa.s | ASTM D2196 |
| Isocyanate Specific Gravity (@ 25ºC) | 1.12 g/ml | ASTM D1475 |
| Gel Time (@ 25ºC) | 4 seconds | - |
| Tack Free Time (@ 25ºC) | 20 seconds | - |
| % Solids (v/v) | 100 % | - |
| Recommended Applied Thickness | 2.0 - 3.5 mm | - |
| Return to Service | ||
| - Light Foot Traffic | 3 minutes | - |
| - Heavy Foot Traffic | 1 hour | - |
| - Continuous Water Immersion | 4 hours | - |
| - Paving. Topping, Backfill, Landscaping | 8 hours | - |
| - Potable Water, Chemical or Abrasion Exposure | 7 days | - |
| Shore A Hardness (minimum) | 90±5 | ASTM D2240 |
| Tensile Strength (minimum) | 19.6 MPa | ASTM D412 |
| Elongation (minimum) | 300% | ASTM D412 |
| Tear Strength (minimum) | 58.8 N/mm | ASTM D412 |
| Taber Abrasion Resistance (maximum) | 50 mg | ASTM D4060 |
| Crack Bridging | Pass | ASTM C836 |
| Pull-Off Strength (minimum) | ||
| - Inter-coat Adhesion | 2.45 MPa | ASTM D4541 |
| - Concrete (Dry) (Substrate Failure Occurred) | 1.00 MPa | ASTM D4541 |
| - Concrete (Primed) (Substrate Failure Occurred) | 2.45 MPa | ASTM D4541 |
| - Steel (90µm blast profile) | 3.43 MPa | ASTM D4541 |
| Potable Water Certification | Certified to exposure of 15,000 mm2 per litre | AS/NZS 4020- 2005 (Certified by AWQC - Australian Water Quality Centre) |
Application Equipment
CHEMSPRAY™ 690 is designed for application through high- pressure, plural component spray equipment capable of processing polyurea coatings. Suitable equipment includes Graco Reactor E-XP2 or H-XP2 machinery fitted with high output heaters, heated lines and Graco Fusion Air Purge or Fusion CS impingement mix spray guns. Equipment should also be fitted with a drum mounted agitator for the polyamine component, material recirculation and drum mounted desiccant driers on both the polyamine and isocyanate components. CHEMSPRAY™ 690 polyamine component must be agitated before and during use. The isocyanate component does not require agitation.
Typical machine spray settings required for CHEMSPRAY™ 690 application are:
| Material Temperature | 20°C to 25°C |
| Main Heater Temperature | 60°C to 70°C Line Heater |
| Temperature | 60°C to 70°C |
| Spray Pressure | 2500 to 2800 psi |
Round pattern spray gun mix chambers will minimise overspray produced considerably.
Application Guidelines
Substrate
Substrates must be clean, dry, and free of curing compounds, oil, grease, solvent or other contaminants. Moisture content of concrete must be below 5%.
Environmental Conditions
The following conditions must be achieved prior to and maintained during CHEMSPRAY™ 690 application.
| Ambient Temperature | 4°C to 45°C |
| Substrate Temperature | 5°C to 60°C |
| Relative Humidity | 85% maximum |
| Dew Point | 3°C below substrate |
| Approximate Wind Speed 10 knots maximum |
Application
CHEMSPRAY™ 690 is typically applied at a minimum Dry Film Thickness (DFT) of 3mm in one or more passes. Required application rates for specific projects may be higher or lower, dependent on structural design, area of application, project specification and product warranty required.
Please contact your local GCP representative or the GCP Technical Department for information specific to your project estimating requirements.
Surfacing
Where colour stability is required in sun-exposed applications, apply our aliphatic, UV-stable topcoat, Ultraure™ A-80 Non-Slip Topcoat, where colour stable protection and a non¬slip finish is required.
Coverage
3.3kg (3.0 litre) of CHEMSPRAY™ 690 system provides coverage of 1m2 at 3.0 mm coating thickness. Allow for processing losses, over spray, etc – typically 10% or greater depending on surface and ambient conditions.
Product Risk
The CHEMSPRAY™ 690 system is not intended for use by other than experienced operators. The data herein requires experience and knowledge to attain correct interpretation and outcome. The user must undertake all relevant tests to determine the suitability for the intended application, as such determination of fitness of purpose for product use, is the sole responsibility of the purchaser.
Packaging
CHEMSPRAY™ 690 Polyamine 200kg drums
CHEMSPRAY™ 690 Isocyanate 210kg drums
Clean-up
Clean-up liquid leakage or spills before hardening occurs using solvents such as xylene, MEK or acetone.
Storage
In case of spills and accidents, refer to the MSDS of the products or when in doubt contact your local GCP representative. Always wear protective clothing, gloves and protective goggles when handling chemical products.
For full information, consult the relevant MSDS.
Limitations
Information contained in this document does not cover all possible application scenarios or imply product suitability for an application. Please contact your local GCP representative or the GCP Technical Department for further information.
Warranties
GCP and contractors recognised by GCP as experienced in the application of GCP products will provide warranties for individual projects. Warranty periods offered are dependent on project details and complexity. Requests for very long warranty periods may necessitate increased membrane thicknesses to ensure longevity. Contact your local GCP representative for further details.
Release Date: 02/11/18. The information contained in this product data sheet supersedes all previous versions.
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We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.
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Last Updated: 2024-04-05
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