Aluminum Case for Marine and Offshore Equipment Transport: Saltwater Corrosion, IP68 Sealing, and Marine Electronics Protection Engineering

The marine and offshore industries operate in one of the most physically demanding environments on Earth. Saltwater spray, sustained high humidity (85-100% RH), galvanic corrosion between dissimilar metals, ultraviolet radiation, extreme temperature cycling (-40 to +70 degrees Celsius in arctic and tropical zones), continuous vibration from vessel propulsion systems, and the mechanical shock of wave-slamming create a transport environment that demands packaging engineered beyond conventional industrial standards. Marine and offshore equipment — navigation electronics, subsea instrumentation, ROV (Remotely Operated Vehicle) components, offshore oil and gas monitoring systems, mooring equipment, and marine survey instruments — represent high-value, safety-critical assets where transport damage can mean the difference between operational readiness and costly vessel downtime. A single marine chartplotter (Furuno NavNet TZtouch, $3,500-$8,000), an ROV control system ($15,000-$50,000), or a subsea pressure housing ($8,000-$20,000) requires transport protection that addresses saltwater corrosion, moisture ingress, ESD, mechanical shock, and pressure differentials. This comprehensive engineering guide examines marine environment challenges, marine-grade aluminum selection, corrosion protection systems, IP68 sealing engineering, marine electronics protection, offshore oil and gas equipment transport, underwater equipment cases, mooring and deck equipment transport, marine survey instrumentation, industry standards, and OEM/ODM solutions for the marine and offshore industry.

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Marine Environment Challenges for Transport Cases

The marine transport environment exposes cases to a combination of corrosive, thermal, and mechanical stresses that far exceed typical industrial transport:

Saltwater Corrosion Environment

Factor	Marine Condition	Impact on Aluminum Case	Test Standard
Atmospheric salt (sea spray)	5% NaCl concentration in spray; chloride deposition 100-500 mg/m2/day within 1km of coast	Pitting corrosion on exposed aluminum surfaces; galvanic corrosion at dissimilar metal contacts	ASTM B117 salt spray (1000-3000h for marine grade)
Sustained humidity	85-100% RH continuous; condensation on thermal cycling	Surface moisture film 10-100um; promotes crevice corrosion at gasket interfaces; galvanic cells at fastener points	MIL-STD-810H Method 507 (humidity 95% RH 10 cycles)
UV radiation	Solar UV 280-400nm at sea level; 300-1000 MED/year depending on latitude	Polymer degradation (gaskets, powder coating, foam); chalk and gloss loss on coatings; embrittlement	ISO 4892-2 UVA-340 2000h
Temperature cycling	-40C (arctic) to +70C (tropical deck); 20-30C daily cycling	Thermal expansion stress on gasket seal; condensation inside case from trapped moisture; pressure differential	IEC 60068-2-14 (Nb) thermal cycling
Vibration (vessel)	Engine vibration 20-200Hz 0.5-3g; wave slam shock 10-30g 11ms half-sine	Fatigue of fasteners; gasket creep; foam compression set; PCB connector fretting	EN 61373 cat 1 (5g longitudinal)

Galvanic Corrosion at Dissimilar Metal Interfaces

In the marine environment, galvanic corrosion is accelerated by the high conductivity of saltwater film. The galvanic series in seawater establishes the electrochemical potential of metals, determining which metal will be the sacrificial anode when two metals are in electrical contact with a saltwater electrolyte bridge:

Metal	Galvanic Potential (V vs Ag/AgCl in seawater)	Role	Compatibility with Aluminum
Zinc	-1.00 to -1.05	Sacrificial anode	Protects aluminum (sacrificial)
Aluminum (5083-H116)	-0.85 to -0.90	Structural	Base material
Cadmium	-0.78 to -0.82	Plating	Compatible (slightly cathodic)
Steel (carbon)	-0.65 to -0.70	Fasteners	Cathodic to aluminum; galvanic risk
Stainless steel (304)	-0.05 to -0.10	Fasteners	Strongly cathodic; galvanic risk
Copper	-0.30 to -0.35	Electrical, gaskets	Strongly cathodic; galvanic risk
Titanium (6Al-4V)	-0.05 to +0.05	Subsea housings	Strongly cathodic; isolation required

Design rule: When fasteners or hardware are made of stainless steel or copper alloy (common in marine electronics connectors), they must be electrically isolated from the aluminum case body. This is achieved through (1) nylon washers and sleeves at fastener interfaces; (2) Dycral-Teflon-coated stainless fasteners; (3) zinc-rich primer at contact surfaces; or (4) sacrificial zinc anodes (10-50g) bonded to the case exterior for cathodic protection. For marine-grade cases, all external fasteners must be 316 stainless with nylon washers, and the case exterior must have a marine-grade coating (ISO 12944 C5-M) to prevent the saltwater film from creating a galvanic cell.

Marine-Grade Aluminum Selection

Not all aluminum alloys are suitable for marine transport cases. The 5000-series (magnesium-alloy) aluminum provides the best combination of saltwater corrosion resistance, weldability, and structural strength for marine case bodies:

Aluminum Alloy Comparison for Marine Cases

Alloy	Temper	Tensile Strength (MPa)	Saltwater Corrosion	Weldability	Marine Suitability
5083	H116/H321	275-350	Excellent (pitting resistance; SCC-resistant in H116/H321)	Excellent (MIG/TIG)	Preferred for marine case body and lid
5086	H116/H32	240-310	Excellent (similar to 5083; slightly lower Mg)	Excellent	Suitable for case body; lower cost alternative
6061	T6	290-310	Good (pitting in sustained saltwater; needs coating)	Good (T6 strength loss in weld HAZ)	Acceptable for internal structure; not preferred for saltwater-exposed exterior without coating
6063	T5/T6	150-215	Fair (lower Cu content helps; but lower strength)	Excellent	Acceptable for extrusion profiles; not for primary body
3003	H14	130-200	Good (low Cu; but low strength)	Excellent	Not suitable (insufficient strength)

5083-H116 selection rationale: 5083 is a 4.5% magnesium aluminum alloy that provides excellent resistance to saltwater pitting and stress corrosion cracking (SCC). The H116 temper is specifically developed for marine applications — it controls the grain structure and precipitation of the beta-phase (Al3Mg2) at grain boundaries, which can cause SCC in non-marine tempers. H116 ensures that the beta-phase is finely dispersed rather than continuous at grain boundaries, preventing intergranular corrosion. For case bodies and lids, 2.0-3.0mm 5083-H116 sheet provides the structural integrity and corrosion resistance required for marine transport cases.

Corrosion Protection Systems

Even with marine-grade 5083-H116 aluminum, additional surface protection is required for cases used in sustained marine environments. The protection system must address pitting corrosion, galvanic corrosion at fastener interfaces, and UV degradation of coatings:

Anodizing (Type II and Type III)

• Type II (sulfuric acid anodize, MIL-A-8625 Type II): A 10-25um oxide layer is grown on the aluminum surface by electrolytic conversion in sulfuric acid. Type II provides moderate corrosion resistance (1000h salt spray per ASTM B117 without white rust) and is suitable for marine cases used in intermittent saltwater exposure (port-to-port transport). The anodic oxide is transparent or dyeable (black for UV resistance). However, Type II anodize is porous (pore diameter 10-20nm) and must be sealed (nickel acetate or hot DI water seal) to prevent chloride ingress into the pores.
• Type III (hard anodize, MIL-A-8625 Type III): A 25-75um thick, dense oxide layer provides superior corrosion resistance (3000h+ salt spray) and wear resistance (HV 400-600). Type III is specified for cases used in sustained marine environments (offshore platforms, vessel deck transport). The thicker oxide is less porous and more resistant to chloride penetration. Type III is typically black or dark gray (integral color) and provides UV absorption. The anodic oxide is electrically insulating (dielectric strength 10-30 kV/mm), which also provides electrical isolation from galvanic corrosion at fastener interfaces.

Marine-Grade Powder Coating (ISO 12944 C5-M)

For the highest level of corrosion protection, the aluminum case is finished with a marine-grade powder coating certified to ISO 12944 C5-M (Marine, Very High corrosivity):

• Primer: Zinc-rich epoxy primer (60-80um DFT), providing galvanic (sacrificial zinc) protection at coating defects. The zinc particles (75-85% zinc by volume in the dry film) provide cathodic protection to the underlying aluminum at scratch edges.
• Topcoat: UV-stable polyester or fluoropolymer (PVDF) powder coating (60-80um DFT). PVDF provides superior UV resistance (2000h+ ISO 4892-2 with dE <3 color change). The topcoat is saltwater-resistant (1000h+ salt spray without blistering) and is available in marine colors (RAL 5010 ocean blue, RAL 7035 light gray for thermal reflection).
• Total DFT: 120-160um (primer + topcoat), meeting ISO 12944 C5-M requirements for marine atmospheric corrosivity.
• Edge coverage: All cut edges (laser-cut sheet, welded joints) receive zinc-rich primer stripe coating before full-body powder coating. This prevents edge corrosion, which is the primary failure point in powder-coated marine cases.

Sacrificial Anode Systems

For cases used in prolonged subsea or immersion conditions (diving equipment, ROV transport), sacrificial zinc anodes provide cathodic protection:

• Zinc anode (MIL-DTL-18001G): A 10-50g zinc anode (Alloy Zn-Al-Cd, ASTM B418 Type II) is bonded to the case exterior via an aluminum weld tab or mechanical bond. The anode maintains the case at -0.85 to -1.00V vs Ag/AgCl reference, cathodic to copper and stainless steel contacts. The anode is consumed sacrificially (0.5-1.0g per year in seawater) and must be replaceable.
• Aluminum anode (Galvalum III): For brackish or estuarine water (lower salinity), aluminum-zinc-indium anodes (Al-Zn-In) provide higher current capacity (2700 Ah/kg vs zinc 780 Ah/kg) and are preferred for long-term deployments.

IP68 Sealing Engineering

Marine transport cases must provide IP68 (dust-tight, immersion 1.5m for 30min minimum; or depth-rated for subsea applications) sealing to prevent saltwater ingress. The sealing system must accommodate thermal cycling (gasket compression changes with temperature), pressure differentials (altitude and depth changes), and aging (gasket compression set):

Gasket Material Selection

Gasket Material	Temperature Range	Saltwater Resistance	UV Resistance	Compression Set (100h @ 70C)	Marine Suitability
Silicone (VMQ)	-60 to +200C	Excellent	Excellent (2000h+)	15-25%	Preferred for marine cases; UV-stable; wide temperature
EPDM	-40 to +150C	Excellent	Excellent	10-20%	Preferred alternative; excellent ozone and saltwater resistance
FKM (Viton)	-20 to +200C	Good	Good	20-30%	For fuel/oil contact (offshore oil and gas); higher cost
Neoprene (CR)	-30 to +120C	Good	Fair	25-35%	Traditional marine gasket; higher compression set
NBR (Buna-N)	-25 to +120C	Fair	Poor	20-30%	Not recommended for marine (poor UV, moderate saltwater)

Design rule: For marine cases, a dual-gasket groove design is specified. The primary gasket (EPDM or silicone, 25-30% compression at the gasket cross-section, Shore A 30-40) provides IP68 sealing. A secondary gasket (same material, 15-20% compression) provides redundancy if the primary gasket fails. The gasket groove (machined or extruded into the lid flange) has a gasket fill ratio of 75-85% (gasket cross-section area / groove cross-section area), ensuring positive compression without over-compression that causes compression set.

Pressure Equalization for Depth and Altitude

Marine cases that undergo depth changes (diving equipment, ROV transport) or altitude changes (air freight for marine equipment) experience significant pressure differentials that can compromise the gasket seal:

• Gore-Tex pressure equalization valve: An IP68-rated Gore-Tex vent (0.1-0.5 bar relief pressure, airflow 10-50 L/min) is installed in the case wall. The valve equalizes pressure between the case interior and exterior while preventing water ingress (Gore-Tex membrane is hydrophobic, 0.2um pore size, blocks liquid water at 1.5m immersion for 30min). The valve prevents case implosion (external pressure > internal) or explosion (internal > external) during rapid pressure changes.
• Depth-rated sealing: For subsea cases rated to 10m depth (1 bar external), the gasket must withstand 1 bar external pressure. The gasket compression is increased to 35-40% to ensure seal integrity under external pressure. The case wall thickness is increased (3.0mm 5083-H116 minimum) to prevent panel deflection under external pressure. For 30m depth (4 bar), the case requires 4.0mm wall and a structural reinforcement frame (aluminum extrusion ribs at 300mm spacing).

Cable Gland Sealing

For marine cases that require cable pass-throughs (sensor cables, power cables, communication cables), the cable glands must provide IP68 sealing and strain relief:

• Marine-grade cable gland (IP68): Brass or 316 stainless body with EPDM or neoprene compression seal. The gland provides IP68 sealing (immersion 1.5m for 30min) and IP69K (high-pressure water jet 100 bar at 80C). The gland includes a strain relief mechanism (gland nut compresses a taper sleeve around the cable) rated for 50-200N pull force.
• Gland nut torque: The gland nut must be torqued to manufacturer specification (typically 5-10 Nm for M16/M20 glands) to ensure proper compression of the seal without over-compression. An anti-vibration locknut (nylon insert, DIN 985) prevents loosening during vessel vibration.

Marine Electronics Protection

Navigation Electronics Transport

Equipment	Value	Weight (kg)	Dimensions (mm)	Transport Risk	Case Protection
Marine chartplotter (Furuno NavNet TZtouch 15)	$3,500-$8,000	5-8	400x300x120	Touchscreen damage; GPS antenna; ESD; saltwater corrosion of connectors	50mm foam, touchscreen protector pad, ESD-safe foam, connector caps, IP68
Radar dome / open array (Simrad Halo24)	$1,500-$3,500	3-7	600-1200mm length	Radome deformation; waveguide damage; mounting bracket	Full-length cradle, radome air gap, bracket pocket
AIS transceiver (Vesper XB-8000)	$500-$800	0.5-1.0	150x100x40	ESD; antenna connector; GPS/VHF connectors	25mm ESD-safe foam, antenna cap, connector caps
VHF radio (Icom IC-M330)	$150-$300	0.5	150x70x50	Microphone connector; speaker; antenna connector	25mm foam, mic pocket, antenna cap
Autopilot control head (Raymarine Evolution)	$800-$2,000	1-2	200x150x60	Keypad; display; fluxgate compass (sensitive to magnetic)	25mm foam, no magnetic materials, compass pocket

Sonar and Fishfinder Transport

• Transducer protection: Sonar transducers (Airmar B744V, $500-$1,500; Lowrance TotalScan, $300-$600) have a precision-machined piezoceramic element and a bronze or plastic housing. The transducer face (the radiating surface) must not be contacted by foam or tooling during transport — a 10mm air gap is maintained in the case cradle. The transducer cable (10-15m, 8-12mm diameter) is coiled with a minimum bend radius of 10x diameter (80-120mm) and stored in a cable management compartment. The case provides 25mm ESD-safe foam for the transducer electronics (if integrated) and 50mm foam for the transducer housing.
• Side-scan and structure scan: Side-scan sonar towfish (Humminbird Mega Live, Edgehumminbird Solix) are 300-500mm length and have external transducer elements. The case provides a custom cradle matching the towfish profile, with relief cutouts for the transducer faces and a pocket for the tow cable (50m, 10mm diameter, coiled with 100mm minimum bend radius).

NMEA 2000 Network Component Transport

NMEA 2000 is the marine standard for interconnecting navigation instruments, using a CAN-based network (DeviceNet micro/Midi connectors, 5-pin). NMEA 2000 components are transported with network cables, terminators, and tee connectors:

• Network cable management: NMEA 2000 backbone cables (DeviceNet, 5-pin, 22AWG, available in 0.6-6m lengths) and drop cables (0.6-6m) are coiled with a minimum bend radius of 10x cable diameter (60-80mm for 6mm cable). The case includes cable management compartments with hook-and-loop straps at 300mm intervals. A dedicated pocket stores terminators (120 ohm) and tee connectors in a labeled hardware pouch.
• Connector protection: DeviceNet micro connectors (5-pin, IP67) must have dust caps installed during transport. The case foam has relief cutouts around connector areas. A spare connector storage area holds replacement connectors and pins.

Offshore Oil and Gas Equipment Transport

Offshore oil and gas operations require transport cases for equipment used in hazardous (explosive atmosphere) zones. Equipment used in Zone 1 (where explosive gas is likely during normal operation) or Zone 2 (where explosive gas is not likely during normal operation) must be certified to ATEX (EU Directive 2014/34/EU) or IECEx (IEC System for Certification to Standards Relating to Equipment for Use in Explosive Atmospheres):

ATEX/IECEx Equipment Transport

Protection Method	Zone	Principle	Case Design Impact
Ex d (flameproof)	Zone 1	Enclosure withstands internal explosion without transmitting flame to external atmosphere	Case does not need to be Ex d certified (equipment is); but case must protect Ex d enclosure from mechanical damage and corrosion
Ex e (increased safety)	Zone 1/2	Eliminates arcs and sparks by design (terminal blocks, increased creepage/clearance)	Case protects Ex e terminals from mechanical and corrosion damage; IP66 minimum
Ex i (intrinsic safety)	Zone 0/1	Limits electrical energy below ignition threshold (zener barrier, galvanic isolator)	Case protects Ex i barriers and isolators; ESD-safe foam; connector protection
Ex n (non-sparking)	Zone 2	No arcs or sparks in normal operation	Standard industrial case with marine-grade protection
Ex p (pressurized)	Zone 1/2	Purges enclosure with protective gas (air/N2) to prevent explosive atmosphere entry	Case protects pressurization equipment; gas line sealing

• Gas detector calibration kit: Portable gas detectors (Crowcon Gas-Pro, $1,500-$3,000; Honeywell BW Max) used on offshore platforms require calibration gas kits. The case includes a dedicated compartment for calibration gas cylinders (58L, 50-100ppm H2S/CO/CH4, 500-2000 psi). The gas cylinder pocket has 25mm foam with a cylinder cradle matching the 58L cylinder profile (100x150mm). The case includes a gas-tight secondary compartment (sealed lid with EPDM gasket) to contain any gas leakage from cylinders. The detector itself is in a separate ESD-safe foam cradle (25mm all sides).
• Valve actuator transport: Offshore valve actuators (electric, pneumatic, hydraulic; $2,000-$15,000, 5-50 kg) have precision mechanical linkages and position feedback sensors. The case provides 50mm foam cradle with a custom profile matching the actuator body. The feedback sensor (potentiometer or Hall effect) must not be subjected to >50g shock. The pneumatic/hydraulic fittings must have caps installed. The case includes a hardware pouch for mounting bolts and gaskets.
• Subsea instrumentation: Subsea pressure transmitters, flow meters, and temperature sensors ($2,000-$10,000) have pressure-rated titanium or 316L housings with SubConn or SeaConn underwater connectors. The case provides 25mm ESD-safe foam and dedicated pockets for the underwater connectors (with mating dummy plugs installed). The titanium or stainless housing must be isolated from the aluminum case body (nylon sleeve or PE foam barrier) to prevent galvanic corrosion.

Underwater Equipment Transport (ROV and AUV)

ROV Electronics Transport

• ROV control system: The ROV topside control unit (VideoRay, Deep Trekker, or SubAtlantic; $15,000-$50,000) contains video monitors, joysticks, power supplies, and communication interfaces. The case provides 50mm foam on all sides, ESD-safe foam around the video processing electronics, and a dedicated monitor compartment with a foam screen protector (5mm closed-cell PE pad). The joystick has a protective cover (molded PE) that is installed during transport.
• Pressure-rated housing transport: ROV subsea electronics housings (titanium 6Al-4V or 316L, rated 300m-6000m depth, $5,000-$20,000) are precision-machined cylinders with O-ring face seals. The housing must be transported with O-rings installed and greased (Krytox GPL 205, fluorinated grease, compatible with most elastomers). The case provides 50mm foam cradle matching the cylindrical housing profile (semi-circular cutouts). The O-ring face must not contact foam — a 5mm air gap is maintained at the seal face. The housing must be electrically isolated from the aluminum case (PE foam barrier or nylon cradle) to prevent galvanic corrosion between titanium/stainless and aluminum.
• Underwater connector protection: SubConn or MacArtney underwater connectors (rubber-molded, 2-48 pins, IP68 rated to 6000m, $200-$2,000 each) must have mating dummy plugs installed during transport. The dummy plug is a sacrificial connector that protects the contact pins and the O-ring seal face. The case provides dedicated foam pockets (25mm all sides) for each connector and its dummy plug. A spare connector storage area is included.
• Pressure compensator: Oil-filled pressure compensators (used in ROV hydraulic and electronic housings to equalize internal oil pressure with external water pressure) have a flexible bladder (Nitrile or Viton) that must not be pinched or punctured during transport. The case provides a flat foam cradle (25mm) for the compensator with a relief cutout for the bladder expansion area.

Mooring and Deck Equipment Transport

• Rope coil management: Marine mooring ropes (Nylon, Polyester, or HMPE/Dyneema; 12-24mm diameter, 50-200m length, 5-50 kg) are coiled and transported in cases with a flat cable management tray (aluminum, 2mm, with rope management hooks at 300mm intervals). The rope is coiled with a minimum bend radius of 10x diameter (120-240mm) to prevent fiber damage. The case includes a fiddle (raised edge, 50mm) to prevent the coil from shifting during vessel motion.
• Chain stopper and winch parts: Deck equipment parts (chain stoppers, winch drum liners, anchor windlass gearboxes) are heavy (5-50 kg) and mechanically sensitive. The case provides 50mm structural foam (Ethafoam 600, 100 kg/m3) with custom-milled cradles matching the part profiles. The case has 4-point lifting handles (recessed, 300-500N each) and a pallet-compatible base for forklift handling.
• Hydraulic power unit (HPU): Offshore HPUs (24V/110V DC, 50-150 bar, 5-30 kg) have hydraulic fittings, pumps, and reservoirs that must be sealed during transport. The case provides 50mm foam with relief cutouts for fittings. Hydraulic port caps (NPT or BSP, 1/4-1/2 inch) are installed. The reservoir vent must have a transit cap. The case includes a dedicated pocket for hydraulic oil (1-5L, in a sealed secondary container).

Marine Survey and Monitoring Instrumentation

Instrument	Value	Weight (kg)	Transport Risk	Case Design
CTD profiler (Sea-Bird SBE 19plus V2)	$15,000-$25,000	5-8	Precision temperature/pressure sensors; conductivity cell; ESD	50mm foam, ESD-safe, sensor guard, desiccant
ADCP (Teledyne RDI Workhorse)	$20,000-$40,000	10-15	Transducer face; electronics bottle; zinc anode	Transducer air gap, 50mm foam, anode pocket
Water quality sonde (YSI ProDSS)	$3,000-$6,000	1-2	Optical sensors; probe guard; cables	25mm foam, probe guard pocket, cable management
Tide gauge (RBR virtuoso)	$2,000-$4,000	0.5-1	Pressure port; battery; data port	25mm foam, pressure port plug, battery compartment
Weather station (Gill MetPak)	$2,500-$5,000	1-2	Ultrasonic sensors; mounting; cables	25mm foam, sensor protection cap, mount pocket
Buoy instrumentation package	$5,000-$20,000	5-20	Solar panel; beacon; antenna; battery	50mm foam, solar panel pad, antenna pocket, battery compartment

CTD profiler protection: The Sea-Bird SBE 19plus CTD has a precision temperature sensor (thermistor, +/-0.002C accuracy), a strain-gauge pressure sensor (+/-0.1% FS), and a conductivity cell (electrodeless inductive sensor). The sensors are mounted on an exposed guard frame at the instrument bottom. The case provides a 50mm Ethafoam 220 cradle matching the CTD profile, with a 10mm air gap around the sensor guard to prevent foam contact. The case interior is ESD-safe (10^6-10^9 ohm) and includes a desiccant system (silica gel, 5g per liter) because the conductivity cell is sensitive to moisture. The data I/O connector (Sea-Bird 6-pin underwater connector) has a dummy plug installed.

Industry Standards for Marine and Offshore Cases

• IEC 60529 (IP Rating): Ingress protection standard. Marine cases must meet IP66 (powerful water jet) minimum; IP67 (immersion 1m, 30min) for deck-transported cases; IP68 (immersion 1.5m+, 30min+) for diving and subsea equipment cases; IP69K (high-pressure, high-temperature water jet, 100 bar at 80C) for washdown-rated cases.
• IEC 60092 (Marine Electrical): International standard for electrical installations in ships. Part 360 covers electrical installations in ships with specific requirements for equipment. Cases transporting marine electrical equipment should align with IEC 60092 environmental requirements.
• DNV 2.7-1 / 2.7-3 (Transport Cases): Det Norske Veritas standards for offshore transport cases. DNV 2.7-1 covers certified offshore service containers (cargo carrying units, CCU). DNV 2.7-3 covers portable offshore units. Cases for offshore transport should reference DNV 2.7-1 for structural design, lifting set, and marking requirements. Key requirements: 6-point lifting, design acceleration 0.8g vertical/0.5g horizontal, 3m stack test, marking plate with ID and safe working load.
• ASTM B117 (Salt Spray): Standard test method for salt spray (fog) testing. Marine-grade coatings must withstand 1000h (C5-M, ISO 12944) or 3000h+ for sustained marine exposure. Test: 5% NaCl solution, 35C chamber, continuous spray. Pass: no white rust (aluminum oxide), no red rust, coating adhesion maintained.
• ISO 12944 C5-M (Marine Coating): Paint system standard for protective coatings. C5-M is the “Marine, Very High” corrosivity category. Requirements: zinc-rich epoxy primer + UV-stable topcoat, total DFT 120-160um, 1000h salt spray, UV resistance 2000h.
• MIL-STD-810H Method 509 (Salt Fog): US military test method for salt fog corrosion. Test: 5% NaCl solution, 35C, 48h or 96h continuous. Cases for military marine applications must survive Method 509 without functional degradation.
• ABS / DNV (Offshore Certification): American Bureau of Shipping and DNV offshore standards for equipment used on offshore installations. Cases used for offshore transport may require DNV 2.7-1 certification for cargo carrying units.

Testing Standards for Marine Cases

• IP68 immersion test (IEC 60529): Case immersed at 1.5m depth (or specified depth) for 30min. Pass: no water ingress; gasket seal maintained. For subsea-rated cases, test at specified depth (10m, 30m) with external pressure.
• Salt spray test (ASTM B117): Case exterior exposed to 5% NaCl spray for 1000h (C5-M) or 3000h (sustained marine). Pass: no white rust, no coating blistering, no under-film corrosion at edges.
• UV weathering (ISO 4892-2): Case exterior exposed to UVA-340 for 2000h. Pass: gloss loss <30%, color change dE <3, no chalking or cracking.
• Vibration test (EN 61373 or IEC 60068-2-6): Random vibration 5-150 Hz, 0.5-1.0 Grms (general marine) or sine sweep 10-500 Hz, 2-5g (vessel engine). Tests vessel transport endurance.
• Drop test (ISTA 3A or ATA 300 Cat I): 10 drops from 0.91m (ATA 300) or packaged-product drop per ISTA 3A. Tests transport durability.
• Thermal cycling (IEC 60068-2-14): -40 to +70C, 5 cycles, 4h per extreme. Tests arctic and tropical marine transport.

OEM/ODM Solutions for Marine and Offshore Industry

For OEM and ODM customers in the marine and offshore industry, we offer fully customized aluminum cases:

• Marine case bodies: 5083-H116 marine-grade aluminum, 2.0-3.0mm wall, Type III hard anodize (MIL-A-8625) or ISO 12944 C5-M powder coating (zinc-rich epoxy primer + PVDF topcoat, 120-160um DFT), sacrificial zinc/aluminum anodes
• IP68/IP69K sealing: dual EPDM/silicone gasket groove (25-30% compression), Gore-Tex IP68 pressure equalization valve, 316 stainless IP69K cable glands, depth-rated sealing for 10-30m subsea
• Galvanic corrosion prevention: nylon washers/sleeves at 316 stainless fasteners, Dycral-Teflon coated hardware, zinc-rich primer at contact surfaces, aluminum isolation barriers for copper/titanium contacts
• Marine electronics: chartplotter cases (touchscreen protector, ESD-safe foam, connector caps), radar dome cradles (radome air gap), AIS/VHF cases (25mm ESD, antenna caps), autopilot cases (non-magnetic, compass pocket), sonar transducer cases (face air gap, 10x bend radius cable management)
• NMEA 2000 network: backbone/drop cable management (10x bend radius), DeviceNet connector cap pockets, terminator and tee storage
• Offshore oil and gas: ATEX/IECEx equipment transport (Ex d/e/i/n protection), gas detector calibration kits (cylinder cradle, gas-tight compartment), valve actuator cases (50mm foam, fitting caps), subsea instrumentation cases (titanium isolation, underwater connector dummy plugs)
• Underwater/ROV: pressure-rated housing cradles (titanium isolation, O-ring face protection, Krytox grease), SubConn/MacArtney connector dummy plug storage, pressure compensator bladder protection
• Mooring/deck: rope coil management (10x bend radius, fiddle tray), chain stopper/winch part cradles (Ethafoam 600, 4-point lifting), HPU cases (fitting caps, reservoir vent, oil container)
• Marine survey: CTD profiler cases (sensor guard air gap, ESD-safe, desiccant), ADCP cases (transducer air gap, zinc anode pocket), water quality sonde cases, tide gauge cases, weather station cases, buoy instrumentation packages
• Standards compliance: IEC 60529 (IP66-IP69K), IEC 60092, DNV 2.7-1/2.7-3, ASTM B117 (1000-3000h salt spray), ISO 12944 C5-M, MIL-STD-810H Method 509, ABS/DNV offshore
• Testing validation: IP68 immersion, salt spray 1000h+, UV 2000h, vibration EN 61373, drop ISTA 3A/ATA 300, thermal cycling -40/+70C
• Branding: laser-engraved DNV 2.7-1 ID plates, marine safety labels, ATEX/IECEx zone labels, RAL/Pantone color matching

Our ISO 9001 certified facility in Changzhou engineers marine and offshore cases validated through IEC 60529 IP68 immersion testing, ASTM B117 salt spray testing (1000-3000h), ISO 4892-2 UV weathering (2000h), EN 61373 vibration testing, ISTA 3A/ATA 300 drop testing, and IEC 60068-2-14 thermal cycling (-40 to +70C). For custom marine case specifications, visit our OEM/ODM Customization page or review our certifications and standards.

Contact Us for Marine-Grade Aluminum Cases

From saltwater-corrosion-resistant 5083-H116 marine aluminum cases with ISO 12944 C5-M powder coating, dual EPDM IP68 gasket sealing, and sacrificial zinc anodes to subsea-rated ROV equipment cases with titanium isolation, Gore-Tex pressure equalization, and SubConn connector protection, every marine and offshore case we engineer is validated through IP68 immersion testing, 1000-3000h salt spray testing, UV weathering, and vessel vibration testing. Our expertise in marine-grade material selection (5083-H116, 5086), galvanic corrosion engineering, marine sealing systems (IP66-IP69K, depth-rated), marine electronics protection (navigation, sonar, NMEA 2000), ATEX/IECEx offshore equipment transport, subsea and ROV equipment cases, and marine industry standards (IEC 60529, IEC 60092, DNV 2.7-1, ASTM B117, ISO 12944 C5-M, MIL-STD-810H Method 509) ensures that your marine and offshore equipment arrives protected from saltwater, corrosion, moisture, vibration, and pressure.

For custom marine-grade case specifications:

• Email: nick@http://http://https://robust-case.com/wp-content/uploads/2026/09/emergency-medical-scene-2.jpg.com/wp-content/uploads/2026/09/722_1691-centered-1-3.png.com/wp-content/uploads/2026/09/faq-support-2.jpg.com
• WhatsApp: +86 176 2594 7792
• Request a Quote with your equipment type (navigation/sonar/ROV/subsea/ATEX/survey), dimensions, weight, depth rating, and marine environment (vessel deck/offshore platform/subsea)

Manufactured in Changzhou, China under ISO 9001 quality management. Compatible with IEC 60529 (IP66-IP69K), IEC 60092, DNV 2.7-1/2.7-3, ASTM B117 (1000-3000h), ISO 12944 C5-M, MIL-STD-810H Method 509, EN 61373, ISTA 3A, ATA 300 Category I, and ATEX/IECEx equipment protection requirements.