Series 21


Generic Type

Phenalkamine Epoxy

Common Usage

High solids, immersion-grade coating offering exceptional build per coat for long-term corrosion resistance. For use on the interior and exterior of steel or concrete tanks, reservoirs, pipes, valves, pumps, and equipment, as well as other steel and concrete substrates. Specially formulated to meet the latest requirements for use in potable water applications.

Special Qualifications

Certified by NSF International in accordance with NSF/ANSI/CAN Std. 61 and the extraction requirements of NSF/ANSI/CAN 600. Series 21 is qualified for interior use on tanks and reservoirs, pipes, fittings, valves and pumps. Reference Tnemec’s certified product listing at for additional details. Conforms to AWWA D102 Inside Systems No. 1, 2, 5 and 6.

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Number of Components

Two: Part A (epoxy) and Part B (amine)


Series 21, 72, 73, 406, 1094, 1095, 1096. Note: A 30 day maximum recoat time applies when topcoating with Series 72, 73, 406. A 9 month maximum recoat time applies when topcoating with Series 21, 1094, 1095, 1096.

Volatile Organic Compounds

Unthinned: 1.20 lbs/gallon (144 grams/litre)
Thinned 10% (No. 88 Thinner): 1.69 lbs/gallon (203 grams/litre) †

Recommended DFT

4.0 to 20.0 mils (100 to 510 microns). Note: Thickness requirements will vary with substrate, application method and exposure. Contact your Tnemec representative.

Theoretical Coverage

1,315 mil sq ft/gal (31.5 m²/L at 25 microns). See APPLICATION for coverage rates. †


Unthinned: 1.14 lbs/gal solids
Thinned 10% (No. 88 Thinner): 1.79 lbs/gal solids

Curing Time

Temperature To Handle To Topcoat Potable Water Immersion
90°F (32°C) 2 hours 4 hours 7 days
75°F (24°C) 3 hours 5 hours 7 days
65°F (18°C) 5 hours 9 hours 8 days
55°F (13°C) 12 hours 18 hours 9 days
45°F (7°C) 20 hours 24 hours 13 days
40°F (4°C) 22 hours 28 hours 18 days
35°F (2°C) 64 hours 72 hours 30 days

Curing time varies with surface temperature, air movement, humidity and film thickness. Note: Maximum recoat time with itself is 30 days.

Volume Solids

82% ± 2.0% (mixed) †


Steel: Self-priming, Series 1, L69, L69F, N69, N69F, 91-H²O, 94-H²O, 98-H_2_O, L140, L140F, N140, N140F, 394
Concrete: Self-priming, L69, L69F, N69, N69F, L140, L140F, N140, N140F, 215, 218.
CMU: Self-priming or Series 215
Note: The following maximum recoat times apply; itself, 30 days; Series 1, L69, N69, 91-H2O, 94-H2O, 98-H2O, L140 or N140, 9 months.

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