Sherlock Leak Detector, MIL-PRF-25567E

Sherlock Leak Detector Type I is an aviation leak detection fluid formulated to meet MIL-PRF-25567E. It is designed to quickly locate leaks in pressurized systems by forming visible bubbles or foam at the leak point.

Used for aircraft maintenance and other professional leak-testing applications, Sherlock can be applied to suspected leak points on pneumatic lines, fittings, connections, tanks, cylinders and other systems that can be tested with pressurized gas. Type I is formulated for use with oxygen and is also effective with air, nitrogen, hydrogen and helium.

Sherlock Leak Detector is available from BAC in convenient 8 oz and 1 gallon sizes.

Sherlock Leak Detector Features

• MIL-PRF-25567E: Meets the military specification for leak-detection compounds used in applicable aviation and oxygen-system leak testing.
• Oxygen compatible: Type I is formulated without oils, fats or other ingredients that could create a combustion hazard in contact with pure oxygen.
• Fast visual indication: Leaks produce visible bubbles or foam at the point of leakage.
• Ready to use: Apply directly to the area being inspected without dilution.
• Broad gas compatibility: Suitable for leak testing systems containing oxygen, air, nitrogen, hydrogen and helium.
• Clean leak detection: The formulation is designed for leak testing without leaving an oily or greasy residue.

Applications

Sherlock Leak Detector is intended for professional leak-testing applications where a pressurized gas system must be checked for leaks. Typical applications include:

How Sherlock Leak Detector Works

Apply Sherlock to the connection, fitting, joint or surface suspected of leaking while the system is under the appropriate test pressure. Escaping gas produces visible bubbles at the leak location, allowing the technician to pinpoint the source.

Small leaks may produce fine white foam that develops and accumulates over time, while larger leaks can produce larger bubbles quickly. This provides a simple visual indication without requiring electronic leak-detection equipment.

Always follow the applicable aircraft maintenance manual, component maintenance manual, system manufacturer's instructions and approved maintenance procedures for the pressure-test method and allowable test pressure.

MIL-PRF-25567E Type I Specifications

Available Sizes

Why Aircraft Mechanics Use Sherlock Leak Detector

Leak detection is a routine part of aircraft maintenance, particularly when inspecting pneumatic, oxygen and other pressurized systems. Sherlock provides a straightforward visual method for locating the source of a suspected leak without requiring specialized electronic detection equipment.

For aviation maintenance organizations, the MIL-PRF-25567E specification is an important purchasing identifier when a leak-detection compound is required to meet an approved maintenance specification. Type I is formulated for oxygen compatibility and is suitable for use across a range of aircraft leak-testing applications.

Application and Handling

• Apply Sherlock directly to the suspected leak area using an appropriate applicator.
• Perform leak testing within the specified temperature range for Type I fluid.
• Use the pressure specified by the applicable aircraft or component maintenance documentation.
• Inspect for bubble formation at fittings, joints, connections and other suspected leak points.
• Clean the area after testing when required by the applicable maintenance procedure.
• Review the current SDS and manufacturer documentation before use.

Important: Product compatibility and the appropriate leak-testing procedure depend on the aircraft, component and system being tested. Always follow the applicable manufacturer's maintenance documentation.

Frequently Asked Questions

What is Sherlock Leak Detector used for?

Sherlock Leak Detector is used to locate leaks in pressurized systems. It can be applied to lines, fittings, connections, tanks, cylinders and other areas where escaping gas can be detected by bubble formation.

Does Sherlock Leak Detector meet MIL-PRF-25567E?

Yes. Sherlock Leak Detector Type I is manufactured to meet MIL-PRF-25567E and is formulated for applicable aviation and oxygen-system leak-testing applications.

Is Sherlock Leak Detector safe for oxygen systems?

Sherlock Type I is formulated for oxygen compatibility and does not contain oils, fats or ammonia that could create a combustion hazard in contact with pure oxygen. Always verify the applicable aircraft or component maintenance requirements before use.

What temperature range is Sherlock Type I designed for?

Sherlock Type I is designed for use from +35°F to +160°F (+1°C to +71°C). A different Sherlock formulation may be required for leak testing outside this range.

How does Sherlock show a leak?

Escaping gas causes bubbles to form at the leak point. Larger leaks can produce visible bubbles quickly, while smaller leaks may produce fine foam that develops more gradually.

What is the shelf life of Sherlock Leak Detector?

BAC currently lists a 24-month shelf life. Store and rotate the product according to the manufacturer's current documentation and the date information on the container.

Sherlock Leak Detector for Aircraft Maintenance

Whether you're troubleshooting an aircraft pneumatic system, inspecting an oxygen connection or checking a pressurized line for leaks, Sherlock Leak Detector provides a simple visual method for identifying the leak location.

Business Aircraft Consumables supplies Sherlock Leak Detector Type I in 8 oz and 1 gallon sizes for aircraft maintenance, MRO, FBO and professional maintenance applications.