551-N Soak Tank Cleaner

551-N is a highly alkaline, carefully balanced detergent system with potent wetting agents. It was specifically formulated to remove highly stable oils, coolants, and drawing compounds from ferrous metals. This special balance of ingredients provides longer solution life, easier oil separation, and more efficient cleaning in agitated soak tanks. It is inhibited to help prevent oxidation.

Physical Properties

Appearance: Off-white Powder
pH @ 1% Solution: 12.8
Odor: Mild
Foaming Action: Moderate/High
Rinsing Action: Excellent
Flash Point: None
Metal Safety: Ferrous Metals Only
Bulk Density: 60
Standard Containers: 40.0 lb Drums
Refer to our Material Safety Data Sheet for additional information.

Usage and Dilution Instructions

Use 4 to 12 ounces per gallon of water. Solution temperature should be maintained at 140° to 160° F. for optimum cleaning efficiency. Periodic adds of 1 to 2 ounces per gallon may be desirable to extend cleaning solution life.

Handling and Storage

This is a highly alkaline product. It contains Sodium Hydroxide. Use good industrial hygiene practices such as wearing chemical safety goggles, rubber gloves, impermeable apron and other appropriate protective clothing to prevent personal contact. Wash thoroughly after handling. In case of skin or eye contact, flush with plenty of water for at least 15 minutes and call a physician. Store in cool dry place in a tightly closed container to reduce caking and rotate stock. When stored as above, shelf life is a minimum of 2 years.


Progress Chemical guarantees its products will perform to your satisfaction when used in accordance to our recommendations. We back this guarantee with over 65 years experience. Our company has been certified to ISO 9001-2015 Quality Standards.