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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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.
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.
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)
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
Recommended DFT
2.5 to 3.5 mils (65 to 90 microns) per coat.
Volume Solids
62.0 ± 2.0%
Theoretical Coverage
996 mil sq ft/gal (24.4 m²/L at 25 microns). See APPLICATION for coverage rates.
Number of Components
One
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