Sodium Hydroxide


Technical Data


Concentration % Temperature1 Resin
0.5 – 5 ≤ 150° F. Derakane 411
6 – 25 ≤ 120° F. Derakane 411
26 – 50 ≤ 150° F. Derakane 411

1. Higher temperatures may be allowed, but the service life of the tank will be reduced. See Derakane’s latest Chemical Resistance Guide.

CAUTION! Fiberglass tanks are NOT designed for sodium hydroxide dilution. Dilution of sodium hydroxide will cause an exothermic reaction resulting in temperatures higher than those allowed for fiberglass tanks.


Two-ply Nexus® (Synthetic)


Co/MEKP (Cobalt Octoate / Methyl Ethyl Ketone Peroxide) in the structural layers


Hot air post cure after assembly for four hours @ 180˚ F.

Tank Exterior:

If the tank is to be located outdoors:

  • Each tank has U.V. inhibitor in the exterior resin layer.
  • Sodium Hydroxide crystallizes at approximately 65° F. The tank may require insulation, as a minimum. However, a tank Heat Maintenance Unit (HMU) may also be required. If the HMU is required, the customer is to specify the Maintain & Outside Ambient temperatures.


Belding Tank uses only Integral (neck and flange face molded together) flanged nozzles.

Bolting Material: T-316 S.S. Standard (Hastelloy-C Optional)

Gasket Material: EPDM Standard


Unless otherwise noted, all tanks are designed for atmospheric pressure only.

Belding Tank recommends the vent be equal to or larger than the largest inlet or outlet fitting.

Plumbing to the tank:

Use of flexible connections resistant to sodium hypochlorite –

  • Allows for lateral and vertical expansion and contraction of the tank
  • Reduces pump and piping vibration stress on the tank

NOTE: Flexible Connections should be connected to the tank flange. Piping, valves and pumps must have structural support independent of the tank.

Copyright Belding Tank Technologies © 2024. | Designed and Developed by: MacRAE'S - Digital Marketing Agency

Request a Quote
Download Brochure