Zip Chem Corban 27L Corrosion Inhibitor

Zip-Chem Cor-Ban 27L is a non-drying corrosion inhibiting compound (CIC) designed to protect aircraft metal surfaces and static joints from corrosion. Its smooth, thixotropic paste forms a flexible, non-drying protective film that remains in place in demanding aviation environments.

Cor-Ban 27L is designed for applications including access panel fasteners, external antenna mounts, static joints and other metal-to-metal interfaces. It provides corrosion protection across a wide temperature range and is suitable for use on intricate parts where a durable, conformable protective coating is required.

Cor-Ban 27L is available from BAC in 5 oz tubes and quart containers.

Cor-Ban 27L Features & Benefits

• Non-drying corrosion inhibitor: Forms a flexible protective film that remains on the substrate rather than drying to a hard coating.
• Wide working temperature range: Designed for typical service from -65°F to 180°F (-54°C to 82°C).
• High corrosion resistance: Demonstrates more than 4,000 hours of corrosion resistance in the ASTM B-117 steel test.
• Excellent low-temperature adhesion: Passes the manufacturer's low-temperature adhesion test at -65°F (-54°C).
• Thixotropic paste: Smooth, uniform consistency without lumps or grit.
• UV resistant: Maintains its protective coating in highly corrosive environments with high ultraviolet exposure.
• Metal compatible: Designed for use on metal surfaces and intricate aircraft components.
• Chromate-free formulation: Contains no chromates, asbestos, MoS₂, graphite or heavy metals.
• Lightning strike tested: Cor-Ban 27L passes the manufacturer's lightning strike test.

Aircraft Applications

Cor-Ban 27L is intended primarily for static joint and substrate corrosion protection. The non-drying compound can be applied to metal surfaces where a flexible protective barrier is desired.

For in-service aircraft applications, always follow the applicable aircraft, component or equipment manufacturer's maintenance instructions.

Cor-Ban 27L Temperature Performance

One of the advantages of Cor-Ban 27L is its broad temperature capability. Zip-Chem specifies a typical working range of -65°F to 180°F (-54°C to 82°C). The product can be used in applications reaching up to 280°F (138°C), including identified gearbox applications. Zip-Chem also states that brief exposure to temperatures as high as 500°F (260°C) has little impact on its corrosion-protective properties.

The 280°F and 500°F figures should not be interpreted as a general continuous operating temperature range. Use the temperature limits specified in the applicable maintenance or equipment documentation for the specific application.

Cor-Ban 27L Technical Properties

Cor-Ban 27L Specifications & Approvals

Zip-Chem's current technical documentation identifies Cor-Ban 27L with the following specifications, manufacturer references and approvals:

Note: Manufacturer specifications and approvals can change. Always verify the current applicable specification and aircraft/component requirements before installation or use.

Application & Removal

Cor-Ban 27L can be applied with a spatula or brush at reasonable ambient temperatures. It can also be applied at elevated temperatures when the application requires improved spreading or coverage.

Zip-Chem recommends preheating Cor-Ban 27L to approximately 100°F to 120°F (38°C to 49°C) to speed application to parts. Follow the applicable application procedure for the specific component.

To remove Cor-Ban 27L, wipe away excess material and flush or wipe the part with an appropriate Zip-Chem cleaner such as Sur-Prep 3160, Sur-Prep 3167 or D-5640NS/ZC-640, or use mineral spirits as permitted by the applicable maintenance procedure.

Important: Zip-Chem states that MEK and other ketones will not remove Cor-Ban 27L from the substrate.

Storage & Shelf Life

Store Cor-Ban 27L in its original unopened container at 40°F to 100°F (4.4°C to 37.8°C). Keep containers closed when not in use and protect the product from direct sunlight.

The manufacturer's current technical data specifies a 3-year shelf life from the date of shipment when properly stored.

Available Cor-Ban 27L Sizes

Frequently Asked Questions

What is Cor-Ban 27L used for?

Cor-Ban 27L is a non-drying corrosion inhibiting compound used primarily on static joints and metal substrates. Typical aircraft applications include access panel fasteners, external antenna mounts and other metal interfaces requiring long-lasting corrosion protection.

Is Cor-Ban 27L a grease?

No. Although Cor-Ban 27L has a paste-like consistency, it is a corrosion inhibiting compound, not a conventional lubricating grease. Its purpose is to form a non-drying protective film for corrosion control.

What is the temperature range of Cor-Ban 27L?

The manufacturer's typical working temperature range is -65°F to 180°F (-54°C to 82°C). Zip-Chem also identifies applications up to 280°F (138°C), including gearbox applications. Always verify the applicable component or equipment requirements.

What is the shelf life of Cor-Ban 27L?

The current Zip-Chem technical data specifies a 3-year shelf life from the date of shipment when properly stored.

How do you apply Cor-Ban 27L?

Cor-Ban 27L can be applied with a spatula or brush. Zip-Chem recommends preheating the material to approximately 100°F to 120°F (38°C to 49°C) to speed application and improve spreading when appropriate.

What Boeing specification does Cor-Ban 27L meet?

Zip-Chem's current technical documentation identifies Boeing BMS 3-38B among the specifications and manufacturer references for Cor-Ban 27L.

What is the difference between Cor-Ban 27L and Cor-Ban 22?

Cor-Ban 27L is the paste-like corrosion inhibiting compound intended for application to static joints and substrates. Zip-Chem identifies Cor-Ban 22 as the liquid application of Cor-Ban 27L. Choose the formulation and application method specified for the particular maintenance procedure.

Cor-Ban 27L for Aircraft Corrosion Protection

Corrosion protection is an important part of aircraft maintenance, particularly at fasteners, static joints, external mounts and other metal interfaces exposed to moisture and corrosive environments. Cor-Ban 27L provides a non-drying protective film designed to remain flexible while protecting the underlying metal surface.

Business Aircraft Consumables supplies Zip-Chem Cor-Ban 27L in 5 oz tube and quart sizes for aircraft maintenance facilities, MRO organizations, FBOs and professional aviation technicians.