BSS 7260 is a Boeing internal specification commonly referenced for compression-based mechanical testing of fiber-reinforced composite laminates, including compression-after-impact (CAI) evaluation used in aerospace materials qualification and comparison.
If you need help matching the cited BSS 7260 type/class to the correct fixture, load capacity, and instrumentation for your laminate thickness range, contact our team and share the exact callout from your drawing or procurement spec.
BSS 7260 (Boeing) — Composite laminate compression & compression-after-impact (CAI)
BSS 7260 is widely used as a referenced method family for evaluating compressive performance of composite laminates, including residual compressive strength after impact damage (CAI). It is most often encountered in aerospace material allowables, qualification programs, and supplier verification testing for laminate systems.
Because BSS 7260 is typically cited with a specific “type” (and sometimes additional qualifiers), the practical test setup depends heavily on the exact callout used in your customer specification.
Quick Definition
In one line: BSS 7260 is a Boeing-referenced standard used to assess compression performance of composite laminates, including CAI residual strength, and it is commonly tied to dedicated fixtures that prevent buckling and guide the specimen during loading.
Common outputs: Residual compressive strength after impact (CAI) and/or compressive properties from end-loaded compression variants, depending on the cited type.
What This Standard Covers
BSS 7260 is most commonly used for compression-after-impact (CAI) testing workflows where a laminate panel is first impacted to create representative damage and is then loaded in compression to failure to quantify retained compressive strength.
BSS 7260 is also frequently referenced alongside end-loading compression approaches used for determining compressive properties of composite laminates, with the specific approach indicated by the “type” cited in the requirement.
Why This Standard Matters in Testing
In composite structures, impact damage can significantly reduce compressive strength even when visible damage is limited. CAI-style testing helps programs compare laminate systems and process variations using a repeatable damage-and-compress sequence.
For supplier QA/QC and qualification, the main risk is not the test machine itself—it is choosing the wrong fixture style or configuration for the required BSS 7260 variant, which can change constraint conditions and failure modes.
Common Materials, Product Types, or Applications Covered
BSS 7260 is most commonly associated with aerospace-grade polymer matrix composites, including carbon-fiber and aramid-fiber reinforced laminate systems.
Typical use cases: Aircraft primary and secondary structures, aerospace panels and subcomponents, and material qualification coupons where damage tolerance and compressive performance are key acceptance concerns.
Common Test or Verification Workflow
Workflows vary by the cited BSS 7260 type, but many labs encounter it in a two-stage CAI sequence: controlled impact to introduce damage, followed by guided compression loading to failure to determine residual compressive strength.
Common workflow elements: Impact event (instrumented drop-weight or equivalent setup) → specimen inspection/handling per program rules → compression loading in a CAI fixture designed to reduce buckling and out-of-plane motion → reporting of residual compressive strength (and related observations) as required by the customer.
Equipment Commonly Used for This Standard
BSS 7260 is equipment-sensitive because it is commonly implemented with dedicated fixtures and alignment practices intended to control buckling and stabilize the coupon during compression.
Common equipment: Universal testing machine (UTM) with appropriate force capacity and compression platens, CAI compression fixture or end-loading compression fixture (as required by the cited type), load cell sized for expected failure loads, and (where required by the program) impact test equipment for the damage event.
Practical selection notes: Fixture geometry and thickness accommodation matter as much as frame capacity; many CAI fixtures use side guidance and adjustable features to match coupon thickness and overall dimensions while maintaining stable end loading.
How to Read This Designation or Revision
BSS 7260 is commonly cited as “BSS 7260” with an additional type designation (for example, Type II for CAI workflows and Type III/IV for certain end-loading compression variants). Some references also include an edition/year (for example, citations that appear as “BSS 7260-88”).
Revision sensitivity: Equipment configuration, fixture style, and acceptance reporting can change depending on the exact type/class and the revision cited in the controlling document, so the purchase spec or drawing callout should be treated as the source for what must be run.
Related Standards, Methods, or Frameworks
Depending on the program, BSS 7260 CAI testing is often aligned with widely used CAI frameworks such as ASTM D7136 (impact) and ASTM D7137 (compression-after-impact), as well as other aerospace methods for CAI and composite compression characterization.
When a customer specification allows alternates, it is still important to confirm fixture type and constraint conditions so results remain comparable.
Get a CAI / composite compression setup matched to your BSS 7260 callout
If you are specifying a CAI fixture, impact system, or a UTM configuration for composites work, you can request a detailed quote with the exact BSS 7260 type/class and your coupon thickness range so the fixture and load rating are matched to your workflow.
