Do you need to validate the compliance of your laminated shims according to MIL-S-22499?
Securing structural adjustments with MIL-S-22499 requirement
In the Aerospace, Space, and Defense (ASD) sectors, assembly precision is a safety imperative. Laminated shims allow for perfect dimensional adjustment during structural assembly. Poor adhesive quality or a non-compliant metal grade can compromise the integrity of your essential parts.
The MIL-S-22499 military specification defines requirements for laminated metallic sheets (shim stock) that can be peeled to the desired thickness. It imposes strict criteria on sheet chemical composition (Aluminum, Steel, Titanium), adhesive bond quality, and ease of peeling without layer deformation.
At FILAB, we support manufacturers in the ASD supply chain with the control and qualification of their materials according to MIL-S-22499, with a clear goal: to ensure the reliability of your technical and industrial decisions.
The MIL-S-22499 requirement: a precision and adhesion challenge
Compliance control of laminated shims according to MIL-S-22499
Compliance with this requirement guarantees that the shims will fulfill their compensation function without oxidizing or delaminating unexpectedly. FILAB intervenes to validate the performance of these complex stacks.
It is specifically used to:
- Verify the metallic grade of the sheets (e.g., Aluminum 1100, Stainless Steel 302/304) by ICP-OES chemical analysis.
- Evaluate adhesive quality and its resistance to aging or aerospace fluids.
- Measure precise thickness of each foil and stacking regularity.
In the Aerospace and Defense industries, compliance with MIL-S-22499 has a direct impact on:
- Assembly precision of mechanical assemblies and control surfaces.
- Resistance to galvanic corrosion between layers.
- In-service behavior of strategic components subjected to constant vibration.
FILAB, a laboratory tailored to aerospace & defense requirements e
An analytical park dedicated to MIL-S-22499 expertise
Analyzing laminated shims requires dual expertise in metallurgy and polymer physico-chemistry (adhesives). To meet the requirements of MIL-S-22499, FILAB provides its clients with state-of-the-art tools:
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Dedicated material expertise services
At FILAB, analyses according to MIL-S-22499 are part of a comprehensive supplier qualification approach. We help assemblers ensure their shims will not lose their properties under real conditions. Our teams work on:
Systematic receiving inspection on laminated shim batches
Fluid compatibility tests (Skydrol, kerosene, oils)
Failure analysis in case of peeling difficulty or premature corrosion
Why choose FILAB?
- 45 years of recognized expertise in analysis and materials science
- Dual competence: Chemistry / Materials
- Specializing in metallic alloys and critical applications
- Customer qualification : Safran, Dassault Aviation, and Framatome
- ISO 17025 Accreditation regarding metallic alloys
Analysis of Iron, Aluminium, Molybdenum, Copper, Tin, Chromium, Titanium, Lead, Nickel, Zinc
Learn moreOur analytical services in accordance with MIL requirements for the ASD sector
Our analytical services based on ISO and ASTM standards for the ASD sector
Our FAQ
The most frequent alloys are Aluminum (Type 1100), Stainless Steel (Type 302 or 304), Brass, and sometimes Titanium for space applications.
Beyond the manual peel test, we observe the surface state after peeling under a microscope to verify that no excessive adhesive residues remain, which could distort the final thickness during assembly.
It remains a major reference in the Component Maintenance Manuals (CMM) of many military and civil aircraft, even if it is sometimes supplemented by more recent manufacturer specifications (or AMS-DTL-22499).
The adhesive must remain stable. Exposure to high temperatures must not make the sheets impossible to peel. FILAB can simulate this thermal aging before testing.
To get a quote, you can contact our teams via our contact form, by phone, or by email. Simply send us your requirements (type of material, desired analysis, specific standard, urgency, sample quantity...). We will then send you a personalized technical and price proposal within 24-48 hours
