Series 91-H2O | Hydro-Zinc

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. 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.
Colors Greenish-gray
Topcoats Please refer to Tnemec's Systems Guide for Water Storage Tanks for specific systems and additional information.
Interior: Series 20, FC20, 22, FC22, L140, L140F, N140, N140F, V140, V140F, 406.
Exterior: Series 27, 27WB, 66, L69, L69F, N69, N69F, V69, V69F, 73, 115, L140, L140F, N140, N140F, V140, V140F, 161, 1028, 1029, 1074, 1074U, 1075, 1075U. Note: Certain topcoat colors may not provide one-coat hiding depending on 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. Note: Series 91-H2O must be exterior exposed for one day prior to topcoating with Series 27WB.
Volume Solids 63.0 ± 2.0% (mixed)
Recommended DFT 2.5 to 3.5 mils (65 to 90 microns)
Curing Time Without 44-710
Temperature †To HandleTo Recoat
75°F (24°C)1 hour4 hours
65°F (18°C)1 1/2 hours5 hours
55°F (11°C)2 hours6 hours
45°F (7°C)2 1/2 hours7 hours
35°F (2°C)3 hours8 hours
† 50% relative humidity. 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 D 102.
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.
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.
Number of Components Two: Part A and Part B

The products listed below are not exact equivalents. They are only products that you may consider as alternatives in a general sense. Substrate type, condition, temperatures, surface preparation, primer/topcoat selection and intended use are just a few factors that will affect product selection. Please contact your local Tnemec Coatings Consultant for product recommendations.

This ProductAromatic Urethane, Zinc-Rich
Volume SolidsRec. DFTV.O.C.# of Components
63.0 ± 2.0% (mixed)2.5 to 3.5 mils (65 to 90 microns)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)
Two: Part A and Part B
Series 94-H2O | Hydro-Zinc Aromatic Urethane, Zinc-Rich
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Volume SolidsRec. DFTV.O.C.# of Components
62.0 ± 2.0% (mixed)2.5 to 3.5 mils (65 to 90 microns) per coat.Unthinned: 0.81 lbs/gallon (97 grams/litre)
Thinned 15% (No. 49 Thinner): 0.81 lbs/gallon (97 grams/litre)
Thinned 10% (No. 3 Thinner): 1.62 lbs/gallon (194 grams/litre)
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