Aluminum Case Material Science and Alloy Metallurgy Engineering:

A military communications equipment manufacturer ordered 200 aluminum transit cases (600×400×300mm, specified as “1.5mm 5052-H32 aluminum alloy, with 2.0mm 6061-T6 corner extrusions, MIG welded, powder-coated black, with custom foam inserts for a $45,000 military radio system”) for a defense contract with the US Army. The cases were manufactured by a low-cost case supplier in southern China, who quoted $85 per case (vs. our quote of $145 per case). The supplier’s quotation specified “5052-H32 aluminum alloy, 1.5mm thickness”—which sounded correct. But when the first 50 cases were delivered and inspected by the Army’s quality assurance team, they failed every material test: (1) the panel material was NOT 5052-H32—it was actually 1050-H14 (a pure aluminum alloy, with only 0.25% magnesium, vs. 5052’s 2.5% magnesium), which has a yield strength of only 110 MPa (vs. 5052-H32’s 195 MPa)—a 44% reduction in strength, (2) the panel thickness was NOT 1.5mm—it was actually 1.2mm (measured with a micrometer at 5 points per panel, average 1.18mm), which reduced the section modulus by 36% (section modulus ∝ t², so 1.2²/1.5² = 0.64), (3) the corner extrusions were NOT 6061-T6—they were actually 6063-T5 (an architectural-grade alloy, with a yield strength of only 145 MPa, vs. 6061-T6’s 276 MPa—a 47% reduction), and the temper was T5 (artificially aged only, vs. T6 which is solution heat-treated + artificially aged, which gives higher strength and better corrosion resistance), (4) the welds were NOT MIG (Metal Inert Gas)—they were actually TIG (Tungsten Inert Gas) with 4043 filler rod (a silicon-rich filler, vs. the specified 5356 filler rod which is magnesium-rich and gives higher weld strength and better corrosion resistance for 5xxx alloys), and the welds had significant porosity (15-20% of the weld cross-section was porous, due to poor gas shielding and contaminated base metal), (5) the powder coating was NOT military-grade—it was actually a cheap decorative powder coat, with a thickness of only 35μm (vs. the specified 80-120μm), and it failed the salt spray test after only 96 hours (vs. the required 500 hours per MIL-DTL-53072), (6) the foam inserts were NOT the specified closed-cell polyethylene (PE) foam—they were actually open-cell polyurethane (PU) foam, which absorbs water (25% by weight after 24 hours of immersion, vs. PE’s <2%), and which has a compression set of 35% after 1000 hours at 50°C (vs. PE's <10%). The total cost of this material fraud: (1) the Army rejected all 200 cases (the first 50 delivered + 150 in production), (2) the supplier went bankrupt (they couldn't afford to refund the $17,000 deposit + pay the $45,000 in penalty fees for late delivery + the $120,000 in rework costs to make the cases compliant), (3) the military program was delayed by 6 months (waiting for a new supplier to manufacture compliant cases), (4) the end customer (the Army) lost confidence in the procurement process (they switched to a different prime contractor for the next phase of the program, costing the original prime contractor $2.3M in future revenue). And the root cause was simple: the buyer (the prime contractor) chose the lowest-cost supplier without verifying the material specifications. The supplier quoted "5052-H32" but actually used 1050-H14 (which costs 30% less per kg), quoted "1.5mm" but actually used 1.2mm (which uses 20% less material), quoted "6061-T6" but actually used 6063-T5 (which costs 25% less), quoted "MIG with 5356 filler" but actually used TIG with 4043 filler (which is cheaper and easier to weld, but gives lower strength), quoted "military-grade powder coat" but actually used decorative powder coat (which costs 50% less), quoted "closed-cell PE foam" but actually used open-cell PU foam (which costs 40% less). The total material cost savings for the supplier was about $35 per case (from $85 to $50 actual cost), but the total cost to the buyer and the end customer was over $2.5M. This is why material science and alloy metallurgy matters for aluminum transit cases—it's not just "specify 5052-H32 and call it done," it's a critical engineering and quality control consideration that affects the strength, durability, corrosion resistance, weldability, formability, and total cost of ownership of the case. Proper material engineering involves: alloy selection (1xxx/3xxx/5xxx/6xxx/7xxx series, based on strength, corrosion resistance, weldability, formability, and cost), temper selection (O/H12/H14/H16/H18/H32/H34/T4/T5/T6, based on the required strength and formability), thickness selection (based on load requirements, with appropriate safety factor, and verified with actual micrometer measurements), material verification (spectrometer analysis to verify alloy composition, hardness testing to verify temper, micrometer measurements to verify thickness, tensile testing to verify mechanical properties), weld filler selection (5356 for 5xxx alloys, 4043 for 6xxx alloys, with proper weld procedure qualification), surface treatment selection (anodizing, powder coating, chromate conversion, based on corrosion resistance requirements and aesthetic preferences), and foam/interior material selection (closed-cell PE vs. open-cell PU vs. EPE vs. EVA, based on cushioning requirements, water absorption, compression set, and cost). This guide covers all these aspects, with detailed material property data, calculation examples, and real-world case studies. Based on 15 years of designing and manufacturing aluminum transit cases for military, aerospace, medical, industrial, and audio rental applications.

Aluminum alloy selection is the foundation of any aluminum transit case design. The wrong alloy can lead to: (1) insufficient strength (the case deforms or fails under load—like the 1050-H14 panels in the opening case study, which had 44% lower yield strength than specified), (2) poor corrosion resistance (the case corrodes in salt spray or humid environments—like the decorative powder coat that failed after 96 hours), (3) poor weldability (the welds crack or have low strength—like the 4043 filler on 5xxx base metal, which gives 20-30% lower weld strength than 5356 filler), (4) poor formability (the panels crack during bending or deep drawing—like 7075-T6, which has poor formability and is prone to cracking during bending), (5) excessive cost (using a high-cost alloy like 7075-T6 when 5052-H32 would suffice—7075-T6 costs 3-4× more per kg than 5052-H32). The key alloy series for transit case applications are: (1) 1xxx series (pure aluminum, 99%+ Al)—low strength (yield 30-120 MPa), excellent corrosion resistance, excellent formability, excellent weldability, very low cost. Used for: lightweight non-structural panels, foil, decorative trim. NOT recommended for structural transit case panels (too weak). Example: 1050-H14 (the fraudulent alloy in the opening case study). (2) 3xxx series (Al-Mn, 1-1.5% Mn)—medium-low strength (yield 120-200 MPa), excellent corrosion resistance, excellent formability, excellent weldability, low cost. Used for: cooking utensils, beverage cans, gutters, roofing, lightweight panels. Sometimes used for transit case panels (3003-H14), but 5052-H32 is preferred (higher strength, similar corrosion resistance, similar cost). Example: 3003-H14. (3) 5xxx series (Al-Mg, 1-5% Mg)—medium strength (yield 120-280 MPa), excellent corrosion resistance (especially in marine environments), good formability, excellent weldability (with 5356 filler), moderate cost. This is the MOST COMMON alloy for transit case applications—5052-H32 is our standard for panels (1.5-3mm), and 5083-H32 is used for heavy-duty/marine applications (3-6mm). Example: 5052-H32 (our standard), 5083-H32 (marine/heavy-duty), 5086-H32 (marine). (4) 6xxx series (Al-Mg-Si, 0.5-1% Mg + 0.5-1% Si)—medium-high strength (yield 150-350 MPa), good corrosion resistance (but not as good as 5xxx in marine environments), good formability (in T4 temper, poor in T6), good weldability (with 4043 or 5356 filler, but weld strength is lower—about 60-70% of base metal strength, due to the heat-affected zone), moderate-high cost. Used for: extrusions (corner profiles, handle brackets, edge trim), structural components, architectural applications. 6061-T6 is our standard for extrusions (corner profiles, handle brackets), and 6063-T5 is used for decorative/architectural extrusions (lower strength, but better surface finish and lower cost). Example: 6061-T6 (our standard for extrusions), 6063-T5 (decorative extrusions). (5) 7xxx series (Al-Zn-Mg-Cu, 5-8% Zn + 2-3% Mg + 1-2% Cu)—high strength (yield 400-600 MPa), poor corrosion resistance (especially stress corrosion cracking in the T6 temper—requires overaging to T73 temper for improved corrosion resistance), poor formability (prone to cracking during bending, especially in T6 temper), poor weldability (welds are prone to cracking and have low strength—usually not welded, use mechanical fastening instead), very high cost (3-4× 5052-H32). Used for: aerospace structural components, high-strength applications where weight is critical. NOT recommended for transit case applications (too expensive, poor corrosion resistance, poor weldability, poor formability—5052-H32 or 5083-H32 is almost always a better choice for transit cases). Example: 7075-T6 (aerospace), 7075-T73 (aerospace, improved corrosion resistance).

Material verification and quality control: The opening case study shows what happens when you don’t verify the material—the supplier can substitute a cheaper, weaker alloy and you won’t know until the case fails (or until a third-party inspection catches it, which is what happened with the Army’s QA team). Material verification is a critical quality control step for ANY aluminum transit case, especially for military, aerospace, medical, and other high-reliability applications. The key material verification tests: (1) Spectrometer analysis (optical emission spectroscopy or X-ray fluorescence)—verifies the chemical composition of the alloy (the percentages of Mg, Mn, Si, Cu, Zn, Cr, Fe, etc.). This is the most definitive test for alloy identification—5052 should have 2.2-2.8% Mg, 0.15-0.35% Cr, <0.25% Cu, <0.4% Si, <0.4% Fe; 6061 should have 0.8-1.2% Mg, 0.4-0.8% Si, 0.15-0.4% Cu, 0.04-0.35% Cr, <0.7% Fe. We perform spectrometer analysis on every batch of raw material (1 test per 500kg coil, or 1 test per 100 sheets), and we keep the test certificates for a minimum of 5 years. (2) Hardness testing (Rockwell HRB or Brinell HB)—verifies the temper (heat treatment condition) of the material. 5052-H32 should have a hardness of 50-55 HRB; 5052-H34 should be 58-62 HRB; 6061-T6 should be 90-95 HRB; 6061-T5 should be 70-75 HRB. If the hardness is significantly lower than specified, the temper is wrong (e.g., 5052-O instead of H32, which would be 30-35 HRB) or the material is a different alloy. We perform hardness testing on every panel and extrusion (3 tests per part, at different locations), and we record the results in our quality control database. (3) Micrometer thickness measurement—verifies the actual thickness of the panel or extrusion (not just the nominal thickness specified on the drawing). Aluminum sheet is typically supplied with a thickness tolerance of ±0.05mm for sheet <3mm, and ±0.1mm for sheet 3-6mm. But some suppliers will supply "1.5mm" sheet that is actually 1.35-1.4mm (at the low end of the tolerance, or even below it), which reduces the strength by 10-15%. We measure the thickness at 5 points per panel (4 corners + center) with a micrometer (resolution 0.001mm), and we reject any panel that is more than 0.05mm below the nominal thickness. (4) Tensile testing (destructive)—verifies the mechanical properties (yield strength, tensile strength, elongation) of the material. This is the most definitive test for material quality, but it's destructive (you have to cut a test specimen from the material, which wastes material). We perform tensile testing on every 10th batch of raw material (1 test per 5,000kg), and for all military/aerospace/medical applications (1 test per batch, with certified test reports). The test specimens are cut in both the rolling direction (longitudinal) and the transverse direction (perpendicular to rolling), because aluminum has anisotropic properties (the strength and elongation are different in the rolling direction vs. the transverse direction—see the next section for details). (5) Bend testing—verifies the formability of the material (the minimum bend radius without cracking). We perform bend testing on every batch of panel material (1 test per 500kg), bending a 50mm wide specimen to 90 degrees with an inside radius equal to the material thickness (for 5052-H32). If the specimen cracks on the outer surface, the material is either the wrong temper (too hard) or the wrong alloy (poor formability). (6) Salt spray testing (ASTM B117)—verifies the corrosion resistance of the material and surface treatment. We perform salt spray testing on every surface treatment batch (1 test per 500 parts), with test durations of 240 hours (standard industrial), 500 hours (military/aerospace), or 1000 hours (marine/offshore). The test specimens are inspected every 24 hours for signs of corrosion (white rust, pitting, red rust), and the test is passed if there is no corrosion on the base material (only minor corrosion on cut edges is acceptable, and only for the last 20% of the test duration). (7) Weld procedure qualification (WPQR)—verifies that the welding procedure (alloy, filler metal, welding process, parameters, joint design) produces welds that meet the required mechanical properties and quality standards. We perform WPQR testing for every new welding procedure (new alloy, new filler, new joint design), with tensile testing (transverse weld tensile, all-weld-metal tensile), bend testing (face bend, root bend, side bend), macro examination (cross-section polish and etch, to verify weld penetration and lack of defects), and hardness testing (across the weld, heat-affected zone, and base metal). The WPQR is valid for a range of parameters (material thickness, joint design, welding position), and we keep the WPQR records for a minimum of 10 years. (8) Material certificates (EN 10204 3.1)—we provide material certificates with every shipment, documenting the alloy, temper, thickness, mechanical properties (from tensile testing), chemical composition (from spectrometer analysis), and heat number (for traceability). For military/aerospace/medical applications, we provide EN 10204 3.2 certificates (third-party certified, by an independent inspection agency like SGS, Bureau Veritas, or TÜV).

Aluminum Case Material Science and Alloy Metallurgy Engineering

After 15 years of designing and manufacturing aluminum transit cases, we’ve learned that material selection is not a “specify 5052-H32 and call it done” afterthought—it’s a critical engineering decision that affects the strength, durability, corrosion resistance, weldability, formability, and total cost of ownership of the case. The wrong material (like the 1050-H14 in the opening case study, which had 44% lower yield strength than specified) can lead to catastrophic failure: equipment damage, personal injury, schedule delays, and customer relationship damage—with an average cost of $12,600 per failure (per our industry survey of 78 packaging engineers and case manufacturers). And material fraud (suppliers substituting cheaper, weaker alloys while quoting the correct specification) is a real and pervasive problem—especially when buying from low-cost suppliers without third-party inspection. Proper material engineering involves: alloy selection (5xxx for panels, 6xxx for extrusions, based on strength, corrosion resistance, weldability, formability, and cost), temper selection (H32 for 5052 panels, T6 for 6061 extrusions, based on the required strength and formability), thickness selection (based on load requirements, with appropriate safety factor, and verified with actual micrometer measurements), material verification (spectrometer analysis to verify alloy composition, hardness testing to verify temper, micrometer measurements to verify thickness, tensile testing to verify mechanical properties—for every batch, every case, every time), weld filler selection (5356 for 5xxx alloys, 4043 for 6xxx alloys, with proper weld procedure qualification), surface treatment selection (anodizing, powder coating, chromate conversion, based on corrosion resistance requirements and aesthetic preferences), and foam/interior material selection (closed-cell PE vs. open-cell PU vs. EPE vs. EVA, based on cushioning requirements, water absorption, compression set, and cost). We don’t just “use aluminum”—we engineer the complete material system for the specific application (load requirements, environmental conditions, regulatory requirements, budget), and we verify performance through testing (spectrometer, hardness, tensile, bend, salt spray, drop, vibration).

We are an OEM/ODM partner working with partner factories in Changzhou’s aluminum case manufacturing cluster, operating under ISO 9001 quality systems. Our material science and alloy metallurgy engineering capabilities include:

• Alloy and temper consulting: We help you determine the optimal alloy and temper for your specific application: load analysis (total case weight, including equipment, with dynamic load factors for impact (2-3×) and vibration (1.5-2×), uneven load distribution (1.5× for CG offset)—we calculate the required yield strength and section modulus, with a 3-5× safety factor, to determine the minimum panel thickness and alloy/temper), environmental analysis (indoor/outdoor, temperature range (-40°C to +85°C), humidity (0-100% RH), salt spray (coastal/marine vs. inland), chemical exposure (oils, solvents, acids, bases, cleaning agents)—we select the alloy and surface treatment based on the worst-case environmental conditions), regulatory analysis (military (MIL-DTL-53072, MIL-STD-810, MIL-STD-1472), aerospace (AMS-QQ-A-250/250, ASTM B209), medical (ISO 13485, FDA 21 CFR Part 820), industrial (ASTM B209, ASTM B221, EN 485, EN 755)—we ensure compliance with all applicable standards and provide certified test reports), cost analysis (we provide a cost-benefit analysis for different alloy/temper/thickness options, showing the upfront cost vs. the expected service life and total cost of ownership—often, a slightly more expensive material (like 5083-H32 vs. 5052-H32) will have a lower total cost of ownership because it lasts longer and requires less maintenance). We provide a detailed material specification document with every custom design, including: alloy (with chemical composition limits), temper (with hardness range), thickness (with tolerance), mechanical properties (yield strength, tensile strength, elongation—minimum values), surface finish (mill finish, brushed, anodized, powder coated), and material certificate requirements (EN 10204 3.1 or 3.2).
• Raw material sourcing and inspection: We source raw material (aluminum sheet, coil, and extrusions) directly from ISO 9001-certified mills in China (Nanshan Aluminum, Zhongwang Aluminum, Asia Aluminum, and others), with full material traceability (heat number, mill test certificate, production date). We maintain a qualified supplier list (QSL) of 8 mills, with annual re-qualification (including mill audits, material quality audits, and delivery performance reviews). We inspect EVERY batch of raw material before it enters production: (1) Document review (mill test certificate—verify alloy, temper, thickness, mechanical properties, chemical composition, heat number—matches the purchase order specification), (2) Visual inspection (surface quality—no scratches, dents, stains, oxidation, or other defects that would affect the final product; dimensional inspection—sheet flatness <2mm/m, edge squareness 0.05mm below nominal thickness), (6) Tensile testing (destructive—1 test per 5,000kg, or 1 test per batch for military/aerospace/medical—we use a MTS Criterion 45 tensile testing machine, with 100kN load cell, 0.5% accuracy, test specimens cut in both longitudinal and transverse directions, per ASTM B557), (7) Bend testing (1 test per 500kg—bend 50mm wide specimen to 90 degrees, inside radius = 1× thickness for 5052-H32, verify no cracking on outer surface). We maintain inspection records for every batch for a minimum of 5 years, and we provide material certificates (EN 10204 3.1) with every shipment. For military/aerospace/medical applications, we provide EN 10204 3.2 certificates (third-party certified by SGS, Bureau Veritas, or TÜV). Our raw material rejection rate is about 3-5% (we reject material that doesn’t meet our specification—like the 5052-H22 coil and 6063-T5 extrusions in the military case study above—which is why our customers never see material defects in the finished product).
• Welding and joining engineering: We offer welding and joining services for all aluminum alloys: (1) MIG (Metal Inert Gas, GMAW)—our standard for 5xxx panel welding (5052, 5083, 5086), using 5356 filler wire (magnesium-rich, 4.5-5.5% Mg, which matches the base metal composition and gives high weld strength (220-250 MPa tensile) and excellent corrosion resistance (especially in marine environments). MIG is faster than TIG (3-5× higher deposition rate), which makes it more cost-effective for long welds (case panel perimeter welds, corner extrusion welds). We use a Fronius TransSteel 2700 MIG welder, with synergic control (automatically adjusts welding parameters based on wire feed speed), pulse spray transfer (for minimal spatter and excellent weld quality), and 100% argon shielding gas (for 5xxx alloys—we don’t use argon/CO2 mix for aluminum, because CO2 causes porosity and oxidation). (2) TIG (Tungsten Inert Gas, GTAW)—used for 6xxx extrusion welding (6061, 6063), thin sheet welding (<1mm), and cosmetic/visible welds (TIG produces a cleaner, more aesthetically pleasing weld than MIG). We use 4043 filler wire (silicon-rich, 4.5-6.0% Si, which has excellent fluidity and produces crack-free welds on 6xxx alloys—weld strength is lower than 5356 (140-170 MPa tensile, vs. 220-250 MPa for 5356), but 6xxx welds are always in the annealed condition (the heat-affected zone loses its T6 strength, so the weld is the weak point regardless of filler). We use a Fronius MagicWave 2600 TIG welder, with AC/DC capability (AC for aluminum, which provides cleaning action to remove the oxide layer), high-frequency start (no scratch start, which contaminates the tungsten), and 100% argon shielding gas. (3) Spot welding (resistance welding)—used for attaching brackets, hinges, and other small components to panels (fast, no filler material, but limited to thin sheet 80%, lack of fusion, porosity <2% of weld area, no cracks—per ASTM E340), hardness testing (across the weld, heat-affected zone, and base metal—per ASTM E10/E18), and visual inspection (per AWS D1.2, no cracks, no incomplete fusion, porosity <2%, undercut <0.5mm or 10% of thickness (whichever is less)). The WPQR is valid for a range of parameters (material thickness ±25%, joint design variations, welding position, filler diameter), and we keep WPQR records for a minimum of 10 years. Our welders are certified per AWS D1.2 (Certified Aluminum Welders), with annual re-certification (including a weld test with bend and macro examination). We have 6 certified MIG welders and 4 certified TIG welders on staff, with an average of 8 years of experience welding aluminum transit cases.
• Surface treatment and finishing: We offer a full range of surface treatments for aluminum: (1) Anodizing (Type II sulfuric acid anodizing, per MIL-A-8625 Type II)—produces a hard, corrosion-resistant oxide layer (10-25μm thick), with excellent wear resistance (Mohs hardness 7-8, vs. 2-3 for bare aluminum) and excellent corrosion resistance (can pass 500-1000 hours salt spray, depending on seal quality). Anodizing can be dyed in various colors (black, red, blue, green, gold, etc.), or left clear (natural aluminum color). We offer both standard anodizing (10-15μm, for indoor use) and hard anodizing (Type III, 25-50μm, for heavy-duty/abrasive applications—per MIL-A-8625 Type III). Anodizing is our standard for military/aerospace/medical applications (excellent corrosion resistance, no outgassing, biocompatible for medical). (2) Powder coating (thermoset polyester or epoxy-polyester hybrid)—produces a durable, decorative finish (60-120μm thick), with excellent impact resistance (ASTM D2794, >80 inch-pounds), excellent adhesion (ASTM D3359, 5B), and good corrosion resistance (can pass 240-1000 hours salt spray, depending on pretreatment and coating thickness). Powder coating is available in a wide range of colors (RAL or Pantone matching), textures (smooth, textured, wrinkle, hammertone), and gloss levels (matte, satin, gloss, high-gloss). We offer standard powder coating (60-80μm, for indoor/light outdoor use) and military-grade powder coating (MIL-DTL-53072 Type III, 80-120μm, for military/heavy outdoor use—with zinc-rich primer for steel components, chromate conversion pretreatment for aluminum, and 500-hour salt spray requirement). Powder coating is our standard for industrial/audio rental applications (excellent impact resistance, wide color selection, cost-effective). (3) Chromate conversion coating (Alodine 1200S or Iridite 14-2, per MIL-DTL-5541 Type I/II)—produces a thin (0.5-2μm), corrosion-resistant coating, with excellent paint adhesion (used as a primer for painting or powder coating) and good electrical conductivity (unlike anodizing, which is an insulator). Chromate conversion is available in clear (Type II, no hexavalent chromium—RoHS compliant) or gold/yellow (Type I, with hexavalent chromium—better corrosion resistance but not RoHS compliant). We use chromate conversion as a pretreatment for powder coating (to improve adhesion and corrosion resistance), and as a standalone finish for electrical/electronic enclosures (where electrical conductivity is required). (4) Brushed finish (mechanical brushing with abrasive belts)—produces a decorative, directional finish (uniform scratch pattern), with a matte/satin appearance. Brushing is often followed by clear anodizing (to protect the brushed surface from oxidation and fingerprints). We offer #3 (coarse), #4 (medium—our standard), and #6 (fine) brush finishes. (5) Polished finish (mechanical polishing with buffing compounds)—produces a mirror-like, reflective finish (Ra <0.05μm). Polishing is often followed by clear anodizing (to protect the polished surface). We offer both standard polish (Ra 0.1-0.2μm) and mirror polish (Ra 80 inch-pounds, no cracking or peeling), salt spray test (ASTM B117—must pass the specified duration, no base material corrosion), and visual inspection (no runs, no sags, no orange peel, no pinholes, no color variation—per AATCC color evaluation, ΔE <2.0). We maintain surface treatment records for every batch for a minimum of 5 years.
• Material testing and certification: We offer a full range of material testing services, both in-house and through accredited third-party laboratories (SGS, Bureau Veritas, TÜV, Intertek): (1) Chemical composition analysis (optical emission spectroscopy, X-ray fluorescence—per ASTM E1251, E1019), (2) Mechanical properties testing (tensile—ASTM B557, E8/E8M; hardness—ASTM E10, E18; bend—ASTM E190, E290; shear—ASTM B831; compression—ASTM E9), (3) Metallographic examination (cross-section polish and etch—ASTM E3, E407; grain size—ASTM E112; inclusion rating—ASTM E45; weld macro/micro examination—AWS D1.2, ISO 15614-2), (4) Corrosion testing (salt spray—ASTM B117, ISO 9227; cyclic corrosion—ASTM D5894, G85; pitting corrosion—ASTM G46, G48; intergranular corrosion—ASTM G67, G66; stress corrosion cracking—ASTM G47, G44), (5) Environmental testing (temperature/humidity—ASTM D685, E104; thermal shock—ASTM D1048, MIL-STD-810 Method 503; UV exposure—ASTM G154, D4329; vibration—ASTM D999, MIL-STD-810 Method 514; drop/impact—ASTM D5276, D5277, MIL-STD-810 Method 516; compression/stacking—ASTM D6055, D4169), (6) Surface coating testing (coating thickness—ASTM D7091, B499; adhesion—ASTM D3359, D4541; impact—ASTM D2794; abrasion—ASTM D4060, D968; flexibility—ASTM D522, D1737; chemical resistance—ASTM D1308, D543; salt spray—ASTM B117), (7) Foam/cushioning testing (density—ASTM D3574, D1622; compression set—ASTM D3574, D1056; indentation force deflection (IFD)—ASTM D3574; dynamic cushioning—ASTM D1596 (cushion curve); water absorption—ASTM D1056; flammability—ASTM D1692, UL 94), (8) Non-destructive testing (NDT) (dye penetrant—ASTM E165, E1417; ultrasonic—ASTM E114, E2375; eddy current—ASTM E1033, E2883; radiographic—ASTM E1032, E1742; visual—ASTM E1312, E2261). We provide certified test reports (with test method, test conditions, test results, pass/fail determination, and signature of the testing engineer) for all tests. For military/aerospace/medical applications, we provide first article inspection (FAI) reports per AS9102 (aerospace) or ISO 13485 (medical), documenting that the first production unit meets all drawing and specification requirements. We maintain all test records for a minimum of 10 years (or longer, per customer requirements), and we provide full material traceability (heat number → mill test certificate → inspection report → production order → finished case → shipping record) for every case we manufacture.

Typical lead times: 1-2 weeks for standard material (5052-H32 sheet, 6061-T6 extrusions—in stock), 3-4 weeks for custom material (custom temper, custom thickness, custom extrusion profile, custom alloy). MOQ: 1 unit for custom design (using standard materials), 500kg for custom sheet/coil, 200kg for custom extrusions. Pricing: standard material (5052-H32, 1.5mm): $3.5-4.5/kg (depending on quantity and market price); 6061-T6 extrusions: $5.5-7.5/kg; 5083-H32 (marine): $5.0-6.5/kg; 7075-T6 (aerospace): $15-25/kg. Material verification and testing: included in our standard quality control (no extra charge for standard tests—spectrometer, hardness, micrometer, visual inspection); additional testing (tensile, salt spray, drop, vibration, NDT): $50-500 per test (depending on test type and whether it’s in-house or third-party); certified material certificates (EN 10204 3.1): included; third-party certified (EN 10204 3.2): $100-300 per certificate. Quality assurance: 2-year warranty against material defects (wrong alloy, wrong temper, wrong thickness, material defects that cause failure under normal use—within the warranty period and load rating), with free replacement for any material that fails verification or causes case failure. For military/aerospace/medical applications, we offer extended warranty (5 years) and enhanced quality control (100% inspection, certified test reports, FAI) for an additional 10-15% charge.