Series 93-H²O
Hydro-Zinc MCU
Generic Type
Aromatic Urethane, Zinc-Rich
Common Usage
A single-component, moisture-cured, zinc-rich primer for steel structures, including 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 coatings. It cures quickly and can be topcoated the same day at surface temperatures down to 35°F (2°C). Series 93-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. 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. Formerly Series 90G-1K97.
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 93-H2O uses a zinc pigment that meets the requirements of ASTM D 520 Type III and contains less than 0.002% lead.
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Volatile Organic Compounds
Unthinned: 2.71 lbs/gallon (323 grams/litre)
Thinned 2.5% (No. 2 Thinner): 2.83 lbs/gallon (339 grams/litre)
Thinned 10% (No. 2 Thinner): 3.13 lbs/gallon (375 grams/litre)
Theoretical Coverage
996 mil sq ft/gal (24.4 m²/L at 25 microns). See APPLICATION for coverage rates.
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. Note: Series 93-H2O must be exterior exposed for three days prior to topcoating with Series 1028, or 1029.
HAPS
Unthinned: 5.19 lbs/gal solids
Thinned 2.5% (No. 2 Thinner): 5.48 lbs/gal solids
Thinned 10% (No. 2 Thinner): 6.36 lbs/gal solids
Curing Time
| Temperature † | To Handle • | To Recoat • |
|---|---|---|
| 75°F (24°C) | 2 hours | 8 hours |
| 55°F (11°C) | 4 hours | 12 hours |
| 35°F (2°C) | 6 hours | 16 hours |
† 50% relative humidity. • Without the addition of No. 44-710 Urethane Accelerator.
Curing time varies with surface temperature, air movement, humidity, and film thickness.
Ventilation: When used in enclosed areas, provide adequate ventilation during application and cure. 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 potable water topcoat product data sheet.
Recommended DFT
2.5 to 3.5 mils (65 to 90 microns) per coat.
Volume Solids
62.0 ± 2.0%
Number of Components
One
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