Dry Graphite Film Lubricant MIL-G-26548B is a high-performance, air-drying solid film coating engineered for extreme-temperature, heavy-load aerospace, defense, and industrial applications. Formulated with sub-micron, high-purity colloidal graphite suspended in a fast-evaporating volatile carrier system, this dry lubricant cures rapidly at room temperature to form a smooth, non-abrasive, friction-reducing surface layer. Designed to meet the stringent military parameters of MIL-G-26548B (and cross-referenced under MIL-L-23398 / MIL-PRF-46147 standards), it prevents metal-on-metal scuffing, scoring, galling, and cold-welding during initial assembly break-in and continuous high-temperature service up to 3000°F (1649°C) in non-oxidizing environments.

Technical Specifications & Cross-References

• Military Specification: MIL-G-26548B (Graphite Dry Film Lubricant)
• Specification Cross-References: Superseded by / Compatible with MIL-L-23398 and MIL-PRF-46147 air-dry solid film baselines
• Chemical Base: Micro-Fine Pure Colloidal Synthetic/Natural Graphite in Volatile Carrier
• Physical State: Aerosol or Liquid Spray / Dip Application
• Color / Finish: Opaque Flat Black to Dark Gray Matte
• Cure Profile: Ambient Air Dry (Tack-free in 2–5 minutes; full air cure in 15–30 minutes)
• Operating Thermal Range: Sub-zero up to 3000°F (1649°C) dry film thermal limit
• Film Characteristics: Non-tacky, electrically conductive, dust/dirt repellent coating

Approved Specifications & Industrial Conformance:

MIL-G-26548B compliant dry graphite lubricants meet rigorous military and aerospace quality controls:

• U.S. Military Standard Conformance: Fully qualified to meet the operational parameters established by MIL-G-26548B for pre-assembly and high-temperature dry lubrication.
• Boundary & Stand-By Lubrication: Functions as a wetting agent to hold fluid oils or provides positive stand-by dry lubrication if fluid oil films are temporarily ruptured under high load.
• Particulate & Dust Repellency: Unlike conventional grease, the dry matte finish will not attract or trap flight-line grit, sand, or airborne abrasive particles.

Key Features & Performance Benefits

• Extreme Temperature Resistance: Withstands operating extremes up to 3000°F (1649°C) without carbonizing or burning off.
• Positive Initial Break-In Protection: Assures immediate lubrication at the moment of initial movement, preventing dry-start wear before oil pressure establishes.
• Rapid Room-Temperature Air Cure: Dries in minutes without requiring oven baking, optimizing MRO field servicing and flight-line maintenance.
• High Load-Carrying Capacity: Lowers the coefficient of friction under extreme mechanical pressures where conventional oils squeeze out.
• Corrosion Protection in Storage: Forms an impermeable barrier that shields prepped metal parts from rust, oxidation, and atmospheric moisture.

Typical Applications

• Aerospace Pre-Assembly & Engine Break-In: Applied to engine valve stems, push rods, splines, bearings, and gears to prevent scoring during startup.
• High-Heat Military Mechanisms: Ideal for exhaust manifold hardware, furnace door slides, turbine linkages, and ordnance slides exposed to severe thermal stress.
• Field Maintenance & MRO Touch-Up: Used on open gears, drive chains, slide rails, and threaded fasteners operating in dusty or high-vibration field environments.

• All in-stock orders are processed within 1–2 business days (excluding weekends and holidays) after receiving your order confirmation email.
• Orders with a lead time will ship according to the estimated shipping time shown on the product page.
• If we experience a high volume of orders or if an item is backordered, processing times may be slightly delayed. We will notify you promptly via email.

• Returns and damage claims must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization - RMA). Returns without prior notice or written authorization will not be accepted. We strongly recommend inspecting the product upon delivery; many products require special storage conditions for which we are not responsible once they arrive to the client's facility. Please review the product's SDS for proper storage and handling.
• For products with 3 to 6 months of remaining shelf life, claims must be made within the next 2 business days after receipt.
• Returns are not accepted for products with less than 3 months of remaining shelf life.
• Returns are not accepted for products purchased during a low Shelf Life promotion, items sold with discounts, or special orders that must be placed directly with the factory.
• The customer is responsible for the return shipping cost, except in cases where the return is due to an error on the part of Aircraft Shop Supply.
• Refunds will only be issued after the product has been inspected and no damage is found.
• A 25% Restocking Fee will be charged for returns of products in good condition that are either no longer needed or were ordered incorrectly.
• A 35% Restocking Fee will be charged for returns of products with one year or less of remaining shelf life.
• No Restocking Fee will be charged if Aircraft Shop Supply is responsible for incorrectly shipping a product, or if the order is damaged upon leaving the warehouse.
• Hazardous Materials & Dangerous Goods: These items are sold as final and are not eligible for return approval.

At Aircraft Shop Supply, we are committed to shipping the highest quality and freshest product possible. To ensure efficient stock rotation and meet aviation industry standards, our inventory management is governed by the following policy:

1. Scope of Application
All Sales Channels: This policy applies to all orders processed by Aircraft Shop Supply, including but not limited to: website purchases, direct email orders, formal Purchase Orders (POs), phone orders, and contract agreements.

2. Inventory Management (FIFO)
All products with an expiration date are managed and shipped on a strict "First In – First Out" (FIFO) basis.

3. Minimum Shipping Margin
Standard Guarantee: We will not ship any products with fewer than 30 days of use remaining (days before expiration), unless previously coordinated and agreed upon with the customer.

No Automatic Guarantees: Outside of this 30-day minimum margin, Aircraft Shop Supply does not make any automatic guarantee as to the specific length of time remaining on any shelf-life item for standard orders.

4. Special Customer Requirements
We understand that certain projects, maintenance schedules, or regulatory standards require strict specifications. If your order has specific shelf-life requirements, please proceed as follows:

How to Request: If you require a specific Date of Manufacture (DOM), Date of Expiration (DOE), or a specific minimum shelf-life percentage (%), you must clearly state this requirement:

In the Comments/Notes section when placing an online order.

Explicitly written on your Purchase Order (PO) or quote request email for offline orders.

Validation Process: Once your requirement is received:

We will ship your order if the available stock matches your specifications.

If we do not have the exact batch, we will contact you prior to shipping with the shelf-life percentage (%) or dates we have available for your acceptance.

5. Limitation of Liability and Validity of Information
To ensure transparency and manage expectations, the following terms and conditions apply:

Time-Limited Validity: Any information provided by our team regarding the remaining shelf-life percentage (%) is valid only at the exact time the inquiry is made. Due to high inventory turnover, availability is subject to change without prior notice.

Informational Purposes Only: Shelf-life data provided by Aircraft Shop Supply is strictly for informational purposes and reflects the availability at the moment of inquiry. It does not constitute a batch reservation or a product warranty.

Supply Chain Liability Exclusion: Aircraft Shop Supply is not responsible for the time elapsed or any product expiration that occurs after the order has been prepared and packed. This includes, but is not limited to: the time between order placement, carrier transit times, intermediary storage, customs delays, and final delivery to the end user. It is the customer's responsibility to account for these logistical lead times within their planning.