The World of Anti-Seize

Blog

September 18, 2017

Anti-seize lubricants are specialty lubricants that reduce friction between threaded and mated metal parts as well as prevent corrosion and seizure of parts under pressure and at temperatures well beyond the performance of conventional lubricants.

Essentially they are two-part systems comprised of a base grease that serves to lubricate parts up to maximum temperature rating of the grease (usually about 350° F.) Secondly, the grease acts as a carrier for special fillers that provide the compound with its anti-seizing, anti-corrosion properties under high pressures and at elevated temperatures (up to 2600° F.).

The special fillers are what differentiates anti-seize compounds from conventional lubricants and give each type of anti-seize lubricant its own specific properties. Each filler is recommended for specific applications and/or temperature ranges. Below is a list and description of the different anti-seize grades.

Anti-Seize Grades

Silver Grade Anti-Seize is a general purpose, high temperature anti-seize lubricant for protecting metal parts against rust, corrosion, galling and seizure at temperatures to 1800° F. It is silver in color and contains copper, aluminum and graphite. Because of fine grade fillers, Silver Grade is particularly suitable for fine threaded and other closely mated parts. It is not recommended for applications where copper is prohibited.

Nickel Grade Anti-Seize is a premium anti-seize lubricant recommended for protecting metal fittings from rust, corrosion, galling and seizure at temperatures up to 2600° F. Formulated from nickel (20%) and graphite, Nickel Anti-Seize provides excellent chemical and oxidation resistance. It is recommended for high temperature, chemically corrosive applications and where the use of copper is prohibited.

Food Grade Anti-Seize is an aluminum complex based anti-seize which is specifically used in applications where incidental food contact is possible. Like Silver Grade, Food Grade Anti-Seize protects metal parts against rust, corrosion, galling and seizure at temperatures up to 1800° F. Food Grade meets NSF H1 requirements for incidental food contact.

Copper Grade Anti-Seize a combination of copper (10%) flake, graphite and other extreme pressure additives. Copper Grade Anti-Seize is copper in color and is not recommended for applications where copper is prohibited. Like Silver Grade, Copper Anti-Seize protects metal parts against rust, corrosion, galling and seizure at temperatures up to 1800° F. It is electrically conductive and does not compromise the integrity of soft metals.

Nuclear Grade Anti-Seize is a premium anti-seize that contains chemically pure nickel and offers superior protection against rust and corrosion. Nuclear Grade is contains no copper, lead, sulfur, halogens, or other ingredients that may poison reactor catalyst beds. Recommended for nuclear fittings, valves and steam mani-folds. Provides maximum protection from high heat up to 2600°F and aggressive chemicals. Nuclear Grade Anti-Seize meets General Electric D50YP12, Westinghouse and Bectel’s nuclear specifications and is tested to MIL-A-907E. It is formulated for use in Class 1, 2, and 3 non-wetted applications for auxiliary equipment in nuclear power plants.

Other Anti-Seize Types for specialty applications:

Nonmetallic compounds allow for exposure to high salt, humidity and generally marine environments. Suited for applications which utilize high nickel alloys and zinc coated fasteners. Nonmetallic Anti-Seize can be used to protect metal surfaces from corrosion related to exposure to the elements. Typically used in the offshore oil rigs and shipping industries.

Zinc Grade is for aluminum threaded components. Used to prevent seizing during assembly or disassembly of threaded or unthreaded components fabricated from aluminum or its alloys, engaged with components fabricated from similar or dissimilar metals. It is also intended to provide corrosion protection to the metal surfaces. This type is typically used in airplane manufacturing.

Any additional questions on Anti-Seize please reach out to CRC technical support at 800.521.3168 as CRC does offer a number of Nickel, Food, Copper and Nuclear Grade products.