Series 249ESD
Static-Shield UR
Generic Type
Aliphatic Moisture Cured Urethane - Electrostatic Dissipative
Common Usage
Extremely hard, chemical-resistant, electrostatic dissipative urethane floor coating with superb wear characteristics. Excellent resistance to abrasion, wet conditions, corrosive fumes and chemical contact. Commonly used in facilities that manufacture, process, assemble, package, service, inspect or otherwise handle electrical or electronic parts, assemblies and equipment susceptible to damage by electrostatic discharges which have established, implemented and maintain an Electrostatic Discharge (ESD) Control Program. Also used in data centers, clean room/labs, computer rooms, military/aerospace, avionics, automotive manufacturing or any environments where electrostatic discharge (ESD) is a nuisance or may have damaging effects.
Ensures permanent and uniform electrical conductivity eliminating “hot spots". Designed for static dissipative resistance in the range of 1x10^6^ to 1x10^9^ (one million to one billion) ohms surface resistance when testing point to point/point to ground for establishing floor resistance values per ANSI/ESD S20.20. Project specifications and application specifics should clearly indicate what resistance range is required. Note: Not intended for industries requiring protection against explosion hazards such as dust, fuels, and solvents or electrically initiated explosive compounds and devices.
Special Qualifications
Series 249ESD meets the requirements of LEED-Low-Emitting Materials, Collaborative for High Performance Schools-Paints & Coatings, WELL Building Standard-VOC Restrictions, and Living Building Challenge–Healthy Interior Performance. Contact your Tnemec representative for more information.
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Volume Solids
92% ± 2.0% (mixed)
Volatile Organic Compounds
Unthinned: 0.64 lbs/gallon (77 grams/litre) (mixed)
Primers
Series 201, 208, 222, 233, 237 or 238 must be used as a primer along with an epoxy intermediate coat to ensure the concrete is sealed and insulated prior to the application of the 249ESD static control topcoat.
Series 241, 242 and 245 are self-priming and an epoxy primer should not be used. Note: Series 241, 242 and 245 must be seeded to refusal with 30/50 mesh aggregate and fully grouted and sealed with 2 coats of pigmented 222, 233, 237, 238 or 281 to fully insulate the Series 241, 242, or 245 base coat prior to applying the 249ESD to insure proper electrostatic dissipative surface resistance values.
Curing Time
| Temperature | Min. Recoat ‡ | To Place in Service | Chemical Resistance |
|---|---|---|---|
| 75°F (24°C) | 12 hours | 24 hours | 7 days |
‡ When recoating, the surface must be thoroughly scarified using 60 grit sandpaper. Note: If more than 24 hours have elapsed, the coating must be mechanically abraded before recoating. Curing time varies with surface temperature, air movement, humidity and film thickness.
Number of Components
Four: Part A, Part B, Part C (powder) and Part D (colorant).
Intermediate
Pigmented Series 222, 230ESD, 233, 237, 238 or 281. Note: If 222, 233, 237 or 238 are used to build broadcast, slurry or mortar systems, they must be fully grouted and sealed with two coats of pigmented 222, 233, 237, 238 or 281 to fully insulate them prior to applying the 249ESD to insure proper electrostatic dissipative surface resistance values. Due to the low pigment load and low film thickness of the 249ESD, the intermediate coat must be the same color as the 249ESD finish coat for proper hide and coverage.
Recommended DFT
2.0 to 3.0 mils (50 to 75 microns) per coat. Note: Number of coats will vary depending on color, substrate (surface) and other variables. Contact your Tnemec representative.
Surfacer/Filler/Patcher
Series 206, 215, 217. Note: Series 201, 208 or 233 mixed with fumed silica can be used for small patching/surfacing repairs. Certain high-early strength, cementious repair mortars are also acceptable for deeper filling and patching. For more extensive repairs and additional information contact your Tnemec representative or Tnemec Technical Services.
Theoretical Coverage
1,476 mil sq ft/gal (36.2 m²/L at 25 microns). See APPLICATION for coverage rates.
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