Series 91-H2O
Hydro-Zinc MCU
Generic Type
Aromatic Urethane, Zinc-Rich
Common Usage
A two-component, moisture-cured, zinc-rich primer for the interior and exterior of steel potable water tanks. Provides outstanding long-term corrosion resistance when used as a primer in conjunction with other Tnemec potable water tank coatings. It cures quickly and can be topcoated the same day at surface temperatures down to 35°F (2°C). Series 91-H2O has no maximum recoat time, making it ideally suited as a primer for both sides of plate steel surfaces in water tank fabrication shops. Application methods include “dry-fall” under certain conditions (see Application). Note: When used in conjunction with cathodic protection, anodes or impressed current systems should not provide current demand more negative than –1.05 volts relative to a copper–copper sulfate reference electrode half-cell.
Special Qualifications
Certified by NSF International in accordance with NSF/ANSI/CAN Std. 61 and the extraction requirements of NSF/ANSI/CAN 600. Reference Tnemec’s certified product listing at www.nsf.org for additional details.
Meets zinc-rich primer requirements of the latest edition of AWWA D102 Standard for Inside System No. 3, 5, and 6 and Outside System No. 3, 4, and 6. Series 91-H2O uses a zinc pigment that meets the requirements of ASTM D 520 Type III and contains less than 0.002% lead.
This product is part of a coating system tested in accordance with ISO 12944-6 (2018). Contact your Tnemec representative for coating system test results.
View more product detailsProduct Data Sheets
- English_Series_91_H2O_Hydro_Zinc_Mcu_pds.pdf
- French_Series_91_H2O_Hydro_Zinc_Mcu_pds.pdf
- Spanish_Series_91_H2O_Hydro_Zinc_Mcu_pds.pdf
Safety Data Sheets
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Colors
- Greenish-Gray
View Available Colors
View available colors in our Color Tool; you can also select and request color swatches.
Volume Solids
63.0 ± 2.0% (mixed)
Curing Time
| Temperature † | To Handle • | To Recoat • |
|---|---|---|
| 75°F (24°C) | 1 hour | 4 hours |
| 65°F (18°C) | 1 ½ hours | 5 hours |
| 55°F (11°C) | 2 hours | 6 hours |
| 45°F (7°C) | 2 ½ hours | 7 hours |
| 35°F (2°C) | 3 hours | 8 hours |
† 50% relative humidity. • Without the addition of No. 44-710 Urethane Accelerator.
Note: Refer to product listings on www.nsf.org for specific potable water return to service information. Curing time will vary with surface temperature, humidity, and film thickness. Ventilation: When used as a tank lining or in enclosed areas, provide adequate ventilation during application and cure. Reference ventilation guidelines contained in the latest edition of AWWA D102. Note: For faster curing, low humidity, and low-temperature applications, add No. 44-710 Urethane Accelerator (see separate product data sheet). Note: For cure times to immersion service, reference the specified Tnemec interior topcoat product data sheet.
Number of Components
Two: Part A and Part B
Topcoats
Interior: Series 21, 22, FC22, L140, L140F, N140, N140F, 406.
Exterior: Series 27, 66, L69, L69F, N69, N69F, 73, 115, V115, L140, L140F, N140, N140F, 161, 1026, 1028, 1029, 1094, 1095, 1096. Note: Certain topcoat colors may not provide one-coat hiding depending on the method of application. Contact your Tnemec representative. Note: Series 91-H2O must be exterior exposed for three days prior to topcoating with Series 1028 or 1029.
Recommended DFT
2.5 to 3.5 mils (65 to 90 microns). Note: Reference the NSF website at www.nsf.org for details on the maximum allowable DFT.
Volatile Organic Compounds
Unthinned: 2.65 lbs/gallon (318 grams/litre)
Thinned 2.5%: 2.76 lbs/gallon (331 grams/litre)
Thinned 10%: 3.07 lbs/gallon (368 grams/litre)
HAPS
Unthinned: 5.05 lbs/gal solids
Thinned 2.5%: 5.33 lbs/gal solids (No. 2 Thinner); 5.06 lbs/gal solids (No. 3 Thinner)
Thinned 10%: 6.19 lbs/gal solids (No. 2 Thinner); 5.09 lbs/gal solids (No. 3 Thinner)
Theoretical Coverage
1,011 mil sq ft/gal (24.8 m²/L at 25 microns). See APPLICATION for coverage rates.
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