Sherlock T1-8S - Type I Gas Leak Detector 8 oz - MIL-L-25567 / MIL-PRF-25567E
The Sherlock T1-8S is the standard warm-weather formulation of Winton Products' aviation-grade oxygen-system leak detector, rated for ambient temperatures from +35°F to +160°F. Certified to both MIL-L-25567 and MIL-PRF-25567E and approved by governmental and commercial laboratories, it is the most widely used leak detection compound in day-to-day aviation maintenance — the default choice for standard hangar work, FBO service bays, heated shop environments, and summer ramp operations where temperatures are above freezing.
The Right Formula for Standard Conditions — And Hot Ones
Sherlock's two-formulation system exists because leak detector chemistry behaves differently across temperature ranges. The T1-8S Type I formula is engineered for performance from +35°F all the way up to +160°F — a range that covers not just standard room-temperature shop work, but also inspection of fittings and lines located near bleed air ducts, engine nacelles, and other high-heat areas that exceed ambient temperature during maintenance. For oxygen system technicians working in those zones, the T1-8S is the correct specification. If your inspection environment drops below +35°F, switch to the Type II formulation (T2-8S), which is rated down to -65°F.
Oxygen System Safe by Formulation, Not Just Label
Many general-purpose leak detection sprays contain soap, ammonia, or petroleum-based surfactants. In oxygen system maintenance, those compounds are a safety hazard — petroleum or organic material introduced into a high-pressure oxygen line can create conditions for ignition. The T1-8S contains zero oil, grease, soap, ammonia, or fats. Its neutral, water-based formulation is cleared for direct application to oxygen cylinders, regulators, high-pressure supply lines, valve bodies, and fittings without introducing any contamination risk.
Key Features
- Certified MIL-PRF-25567E Type I and legacy MIL-L-25567 — meets U.S. Air Force specification
- Warm-weather and high-heat rated: +35°F to +160°F (+1.7°C to +71°C) — covers standard shop, ramp, and elevated-temperature inspection zones
- Oxygen-system safe: zero oil, grease, soap, or ammonia content
- 5-second response: fine leaks form persistent white foam within seconds; large leaks produce immediate bubble clusters
- Dries completely clean — no greasy residue, no secondary cleanup required
- Effective on oxygen, nitrogen, hydrogen, helium, pneumatic, fuel, and inflatable safety systems
- 8 oz squeeze bottle with precision tip for directed application on fittings, tube joints, and valve ports
- 1-year shelf life from date of manufacture
- Manufactured by Winton Products Co., Inc. — original Sherlock formula producer
Applications
- Aircraft oxygen system cylinders, regulators, supply lines, and valve fittings
- Bleed air duct fittings and high-temperature pneumatic line connections
- Fuel tank pressure and vapor-seal leak testing
- Nitrogen-charged hydraulic accumulators and brake systems
- Pneumatic actuator and flight control system fittings
- Inflatable safety equipment: life vests, emergency rafts, and escape slides
- General compressed gas and pressurized system testing on aircraft, ground support equipment, and test rigs
How to Use
With the system under operating or test pressure, apply the T1-8S solution directly to the fitting, joint, or surface under inspection. For fine or pinhole leaks, watch for white foam that builds progressively — do not dismiss a site after just a few seconds. The Sherlock formulation is designed to accumulate foam over ten minutes or more on very small leaks, making detection certain even when other methods would miss it. For gross leaks, expect immediate, visible bubble clusters. After inspection, allow the solution to dry — it leaves no residue and requires no wiping before component reinstallation.
Sizes and Related Products
The Type I formula is also available in the T1-4S (4 oz), T1-G (1-gallon jug), T1-P-5 (5-gallon pail), and T1-D (55-gallon drum). For cold-weather or below-freezing inspections, the companion Type II formulation T2-8S is rated from -65°F to +35°F and meets the same MIL-PRF-25567E specification. Both types are approved for the same system categories — select based on your operating temperature range.
| General Information | |
|---|---|
| Part # | T1-8S |
| Manufacturer | Sherlock |
| Specifications | |
|---|---|
| Container Type | Squeeze bottle with tip applicator |
| Corrosive | No |
| Flammable | No |
| Formulation | Neutral, water-based solution |
| Manufacturer | Winton Products Co., Inc. |
| Net Volume | 8 oz (237 mL) |
| Oil / Grease Content | None |
| Oxygen Compatible | Yes |
| Residue | Dries clean, no greasy residue |
| Shelf Life | 1 year from date of manufacture |
| Standard | MIL-PRF-25567E Type I |
| Temperature Range | +35°F to +160°F (+1.7°C to +71°C) |
| Testing Method | Visual bubble formation |
| Toxic | No |
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QUESTIONS & ANSWERS
The T1-8S Type I formula is rated for use from +35°F to +160°F (+1.7°C to +71°C). This covers standard shop and hangar temperatures, summer ramp operations, and elevated-temperature inspection zones near engine nacelles and bleed air ducting. For environments below +35°F, the Type II formulation (T2-8S) is the correct choice, rated down to -65°F.
Yes. The T1-8S is a neutral, water-based formulation containing no oil, grease, soap, ammonia, or petroleum compounds. It meets MIL-PRF-25567E Type I and is routinely used in certified MRO and military maintenance for direct application to high-pressure oxygen cylinders, regulators, supply lines, and valve fittings without contamination risk.
One year from the date of manufacture. Label the bottle when received and rotate stock accordingly. The Type II (T2-8S) shares the same shelf life.
Immediately on large leaks — visible bubble clusters form on contact with any significant breach. For fine or pinhole leaks, a persistent white foam builds over a period of up to ten minutes. This extended accumulation response is a key advantage over less sensitive alternatives: do not conclude a fitting is leak-free after only a few seconds of observation on a slow system.
