Corrosion Resistant Aluminum Honeycomb Impact Attenuator with 2000 to 3850 psi

Product Specification

Corrosion Resistant Aluminum Honeycomb Impact Attenuator with 2000 to 3850 psi Crush Strength for Marine Transport and Long Term Storage

The Corrosion Resistant Aluminum Honeycomb Impact Attenuator is a high‑performance energy‑absorbing core engineered specifically for harsh marine environments and extended storage periods. Designed with a crush strength range of 2000–3850 psi (adjustable per application), this attenuator delivers reliable, constant‑force impact protection for nuclear spent fuel casks, radioactive material shipping packages, and offshore facility barriers – even after years of exposure to salt spray, humidity, and temperature fluctuations.

Built from 5052 aluminum alloy with a passivated/anodized finish, the honeycomb structure resists pitting and galvanic corrosion, ensuring that its mechanical crush characteristics remain fully intact throughout the service life. Pre‑crushing and bi‑directional options are available to tailor the force‑deflection response to your specific cask design and regulatory drop‑test requirements.

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2. Key Features

Feature Benefit
High Crush Strength (2000–3850 psi) Compatible with heavy‑duty transport casks; provides sufficient resistance for 9‑m drop scenarios.
Corrosion‑Resistant Alloy (5052) + Coating Withstands salt‑water exposure, humidity, and chemical contaminants – ideal for sea‑voyage and coastal storage.

Constant‑Force Crush Plateau Ensures predictable deceleration and minimal peak acceleration, simplifying safety analysis.

Temperature & Humidity Stability Performance unchanged from –20°F to 100°F (–29°C to 38°C) and 0–100% relative humidity.

Lightweight Construction Low density reduces overall cask weight, improving handling and shipping economics.

Customizable Geometry Available in blocks, panels, or complex machined shapes to fit any limiter or barrier design.

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3. Technical Specifications

Parameter Value / Range
Material Aluminum Alloy 5052 (corrosion‑resistant grade)
Crush Strength (Plateau Stress) 2000 – 3850 psi (adjustable via foil thickness & cell size)
Nominal Density 22 – 27 lb/ft³ (depending on crush strength)
Maximum Crush Stroke Up to 70% of original thickness (constant force region)
Operating Temperature –20°F to 100°F (–29°C to 38°C)
Corrosion Protection Anodized / passivated surface; meets ASTM B117 salt‑spray resistance
Cell Size Options 1/8″, 1/4″, 3/8″, 3/4″, 3/16″ (customizable)
Foil Thickness 0.04 – 0.10 mm (customized to target crush strength)
Configuration Unidirectional, bi‑directional (cross‑core), pre‑crushed or un‑crushed

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4. Application Scenarios

Application Description
Spent Fuel Transport Casks (Marine) Impact limiters for casks shipped by sea – resistant to salt‑water corrosion during long voyages.
Long‑Term Storage Casks Attenuators that maintain structural integrity after decades of storage in coastal or humid facilities.
Offshore Nuclear Facilities Impact barriers for floating or platform‑based nuclear installations.
Radioactive Material Packages Secondary protection for sensitive contents exposed to marine environments.

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5. Corrosion Resistance – Why It Matters

Unlike wood or polyurethane foam, which degrade with moisture absorption, aluminum honeycomb with a protective finish remains dimensionally stable and chemically inert. The 5052 alloy offers excellent resistance to seawater and industrial atmospheres, while the anodized layer further prevents galvanic corrosion when in contact with dissimilar metals (e.g., steel cask components).

Accelerated salt‑spray testing (per ASTM B117) confirms no measurable loss of crush strength after 1000+ hours of exposure – equivalent to decades of marine service.

Specifications:

Pasia Honeycomb Energy Absorbers can be supplied based on the cell size, foil thickness and layer, aluminum grade, width and length etc. The shape and parts can be also customized as per the request from client. The crush strength can be achieved on the performance of the foil thickness and special structure.

Testing Item: Aluminum Honeycomb Plain Crushing Strength

Testing Data

Testing Curve: