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 details

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)

Number of Components

Two: Part A and Part B

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.

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.

Still have questions? Request the information you’re looking for:

Request Info

How to Purchase

Tnemec coatings are sold through a select network of local independent sales representatives who can help you find the best product for your needs. Find a rep

Continue Exploring in the color tool

Close

Color Swatch packet

You can use our Color Tool page to explore our available colors and request swatches of colors you like.

Sorry, there is a maximum of 6 color swatches.

Request swatch packet

Continue Exploring in the color tool

Close