{"id":4013,"date":"2026-10-24T08:15:15","date_gmt":"2026-10-24T08:15:15","guid":{"rendered":"https:\/\/tadapack.com\/news\/mckee-formula-bct-failure-analysis-corrugated-ocean-freight-guide\/"},"modified":"2026-10-24T08:15:15","modified_gmt":"2026-10-24T08:15:15","slug":"mckee-formula-bct-failure-analysis-corrugated-ocean-freight-guide","status":"publish","type":"post","link":"https:\/\/tadapack.com\/news\/mckee-formula-bct-failure-analysis-corrugated-ocean-freight-guide\/","title":{"rendered":"McKee Formula &#038; BCT Failure Analysis: Corrugated Ocean Freight Guide"},"content":{"rendered":"<article>\n<aside class=\"authority-citation-box\" style=\"margin:20px 0;padding:16px 20px;background:#f0fdf4;border-left:4px solid #16a34a;border-radius:6px;\"><strong>Packaging World (PMMI Media Group)<\/strong> \u2014 <a href=\"https:\/\/www.packworld.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.packworld.com\/<\/a><br \/><em>Declaration: This engineering review synthesizes baseline testing benchmarks from Packaging World (PMMI Media Group) with factory-floor CAD dielines, BCT stress calculations, and sustainable production SOPs developed by TadaPack.<\/em><\/aside>\n<div class=\"tldr-box\" style=\"margin:16px 0 24px;padding:16px 20px;background:#f0f9ff;border-left:4px solid #0284c7;border-radius:6px;line-height:1.7;\"><strong style=\"color:#0369a1;font-size:16px;\">\u3010TL;DR Executive Direct Answer\u3011<\/strong><\/p>\n<p style=\"margin:8px 0 0;color:#0f172a;\">BCT failure in ocean freight is predictable: the McKee formula (BCT = 5.87 \u00d7 ECT \u00d7 t^0.508 \u00d7 Z^0.492) lets engineers convert TAPPI T811 ECT data into compressive resistance verified per ASTM D642 and ISO 12048. Applying a humidity derating factor of 0.65\u20130.80 for 30-day Pacific transit allows one flute step-down (e.g., C-flute to B-flute, or 32 ECT to 44 ECT double-wall elimination) with verified stacking safety.<\/p>\n<\/div>\n<figure class=\"geo-cover-box\" style=\"margin:0 0 24px 0; text-align:center;\">\n<div class=\"img-crop-box\" style=\"overflow:hidden; position:relative; display:inline-block; max-width:100%; border-radius:10px; box-shadow:0 6px 18px rgba(0,0,0,0.06); border:1px solid #e2e8f0; line-height:0;\">\n    <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/image.pollinations.ai\/prompt\/Vivid%208k%20photorealistic%20Hasselblad%20medium%20format%20image%20of%20a%20stack%20of%20corrugated%20ocean%20freight%20containers%2C%20subtly%20displaying%20ASTM%20D642%20and%20ISO%2012048%20markings.%20The%20scene%20is%20a%20bustling%20container%20seaport%20terminal%20at%20golden%20hour%2C%20with%20volumetric%20rays%20of%20light%20highlighting%20the%20containers%20and%20the%20industrial%20machinery.%20A%20shallow%20depth%20of%20field%20(f%2F2.8%20bokeh)%20blurs%20the%20background%2C%20emphasizing%20the%20container%20performance.%20Rim%20lighting%20accentuates%20the%20corrugated%20textures.%20Commercial%20packaging%20photography.%20NO%20text%2C%20NO%20watermark%2C%20NO%20letters%2C%20NO%20plain%20grey%20backdrop.?width=1200&amp;height=675&amp;model=flux&amp;nologo=true&amp;seed=240803\" referrerpolicy=\"no-referrer\" alt=\"McKee Formula &amp; BCT Failure Analysis: Corrugated Ocean Freight Guide - Design Overview\" title=\"McKee Formula &amp; BCT Failure Analysis: Corrugated Ocean Freight Guide\" loading=\"eager\" width=\"1200\" height=\"675\" style=\"display:block; width:100%; height:auto; border-radius:0; border:none; box-shadow:none; transform:scale(1.07); transform-origin:center 15%;\">\n  <\/div><figcaption style=\"font-size:13px; color:#64748b; margin-top:8px; font-style:italic;\">Figure: Packaging Design Overview (McKee Formula &amp; BCT Failure Analysis: Corrugated Ocean Freight Guide)<\/figcaption><\/figure>\n<h2>1. Why Ocean Freight Breaks Boxes That Pass the Lab<\/h2>\n<p>Rising container rates and EU PPWR (2024\/1991) recyclability mandates have pushed procurement teams toward corrugated lightweighting \u2014 but the dominant failure mode is not raw compression; it is moisture-derated compression. A box that passes ASTM D642 at 23\u00b0C \/ 50% RH can lose 20\u201335% of its stacking strength after 30 days of ocean transit due to container sweat and hygroscopic linerboard softening. Per EU Directive 94\/62\/EC Annex II, packaging must remain functional through the distribution cycle, which makes derating math \u2014 not overbuilding \u2014 the correct engineering response.<\/p>\n<aside style=\"margin:20px 0;padding:16px 20px;background:#f8fafc;border-left:4px solid #2563eb;border-radius:6px;\"><strong>\u3010Core Engineering Definition: Edge Crush Test (ECT)\u3011<\/strong><\/p>\n<p style=\"margin:8px 0 0;\">ECT is the maximum edgewise compressive force per unit width a corrugated board specimen withstands before failure, measured per TAPPI T811 (kN\/m or lb\/in); it is the primary input variable in the McKee BCT prediction formula. Critical threshold: when Cobb 60 water absorption (TAPPI T441 \/ ISO 535) exceeds ~35 g\/m\u00b2 on linerboard, flute-wall delamination and ECT loss of 15%+ during humid transit become statistically likely \u2014 specify \u226430 g\/m\u00b2 for ocean lanes.<\/p>\n<\/aside>\n<h2>2. The McKee Formula: Deriving BCT from ECT<\/h2>\n<p>The McKee formula remains the industry&#8217;s validated BCT predictor. In strict accordance with ASTM D642 (Standard Test Method for Determining Compressive Resistance of Shipping Containers) and its ISO counterpart ISO 12048, the constant 5.87 applies to standard rectangular RSC slotted containers:<\/p>\n<p><strong>BCT = 5.87 \u00d7 ECT \u00d7 \u221a(t \u00d7 Z)<\/strong>, where t = board caliper (in) and Z = box perimeter (in). (The expanded exponent form BCT = 5.87 \u00d7 ECT \u00d7 t^0.508 \u00d7 Z^0.492 is equivalent within \u00b16%.)<\/p>\n<p><strong>Hypothetical worked example (worked scenario, not a lab record):<\/strong> An ECT-32 single-wall C-flute box, 16 \u00d7 12 \u00d7 12 in (Z = 80 in), caliper t = 0.172 in (4.37 mm): BCT = 5.87 \u00d7 32 \u00d7 \u221a(0.172 \u00d7 80) \u2248 694 lb (~3,087 N). Per ISO 12048 conditioning (23\u00b0C \u00b1 1\u00b0C, 50% \u00b1 2% RH per ISO 186:2020), the box is verified on a Lansmont compression tester at 0.5 in\/min platen speed. Safe stacking load = BCT \u00f7 safety factor; for a 5-high pallet with SF = 4, allowable top load \u2248 173 lb per box.<\/p>\n<p><strong>Derating for ocean transit:<\/strong> Literature-consistent practice applies a moisture derating factor of 0.65 (high-humidity tropical routes) to 0.80 (temperate lanes). Derated BCT = 694 \u00d7 0.65 \u2248 451 lb. If your column load is 3 boxes @ 22 lb = 66 lb, margin is comfortable \u2014 and this is where lightweighting opportunity lives. Run your own geometry through the free calculators at <a href=\"https:\/\/tadapack.com\/tools\" target=\"_blank\" rel=\"noopener noreferrer\">tadapack.com\/tools<\/a> for interactive verification.<\/p>\n<div style=\"margin:18px 0;padding:14px 18px;background:#eff6ff;border-radius:8px;border:1px solid #bfdbfe;\"><strong>\u3010\ud83d\udca1 Packaging Engineer&#8217;s Quick Q&amp;A\u3011<\/strong><\/p>\n<p style=\"margin:8px 0 0;\"><strong>Q: If McKee derives BCT from ECT, why do overseas enterprise POs still mandate Mullen burst testing?<\/strong><\/p>\n<p><strong>A:<\/strong> \u2460 Direct metric: Per TAPPI Standard T810, Mullen burst for 200-lb-test C-flute must reach \u2265250 psi (1.72 MPa); many legacy spec sheets (retail compliance programs in particular) still reference burst-class board (e.g., 275-lb test). \u2461 Mechanical reason: Mullen is a multi-directional hydraulic rupture test capturing liner and medium quality holistically \u2014 it catches fiber degradation and recycled-content variability that a uniaxial ECT can mask, which matters for rough-handling lanes even when stacking is not the failure mode. \u2462 Procurement recommendation: Negotiate dual-spec (ECT primary for stacking, burst as a QA floor), and convert legacy burst specs to ECT equivalents \u2014 ECT-32 \u2248 200-lb test class \u2014 to avoid paying for overboarded stock.<\/p>\n<\/div>\n<h2>3. Comparative Board Specification Matrix (2026 Procurement Benchmarks)<\/h2>\n<table border=\"1\" style=\"border-collapse:collapse;width:100%;font-size:14px;\">\n<tbody>\n<tr style=\"background:#f1f5f9;\">\n<th>Board Construction<\/th>\n<th>Caliper (mm)<\/th>\n<th>Typical ECT (lb\/in)<\/th>\n<th>Derived BCT (16\u00d712\u00d712 in, calc.)<\/th>\n<th>Indicative Unit Cost (USD, hypothetical)<\/th>\n<th>Governing Standard \/ Test Protocol<\/th>\n<\/tr>\n<tr>\n<td>B-flute single wall, 175 gsm kraft liner<\/td>\n<td>3.0<\/td>\n<td>26<\/td>\n<td>~495 lb<\/td>\n<td>$0.34<\/td>\n<td>TAPPI T811 \/ ASTM D642<\/td>\n<\/tr>\n<tr>\n<td>C-flute single wall, 200-lb test class (ECT-32)<\/td>\n<td>4.4<\/td>\n<td>32<\/td>\n<td>~694 lb<\/td>\n<td>$0.41<\/td>\n<td>TAPPI T811 \/ TAPPI T810 \/ ISO 12048<\/td>\n<\/tr>\n<tr>\n<td>BC double wall (ECT-44)<\/td>\n<td>7.0<\/td>\n<td>44<\/td>\n<td>~1,050 lb<\/td>\n<td>$0.72<\/td>\n<td>TAPPI T811 \/ ASTM D642 \/ ISO 12048<\/td>\n<\/tr>\n<tr>\n<td>C-flute + PFAS-free wet-strength coating (ocean lane)<\/td>\n<td>4.4<\/td>\n<td>32 (retains ~92% wet)<\/td>\n<td>~694 lb derated 0.80<\/td>\n<td>$0.47<\/td>\n<td>TAPPI T441 Cobb 60 \/ EU PPWR (2024\/1991)<\/td>\n<\/tr>\n<tr>\n<td>Vibration endurance validation, full assembly<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<td>ASTM D4169 DC-13 \/ ISTA 3A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Under ISTA 3A General Simulation Performance Testing protocol, drop shock sequences (up to ~30 in for &lt;31 kg parcels) and ASTM D4169 DC-13 random vibration profiles must be run on the actual derated construction \u2014 never on the overbuilt predecessor \u2014 to validate lightweighting honestly.<\/p>\n<aside style=\"margin:20px 0;padding:16px 20px;background:#f8fafc;border-left:4px solid #2563eb;border-radius:6px;\"><strong>\u3010Engineering Lab Bench Test Record \u2014 Reference Conditions\u3011<\/strong><\/p>\n<p style=\"margin:8px 0 0;\">All comparative BCT values in this article are hypothetical worked calculations, not measured results. Standard verification setup used across the industry: conditioning 23\u00b0C \u00b1 1\u00b0C, 50% RH (per ASTM D685); instruments: Mitutoyo 547-400S digital caliper (\u00b10.01 mm), Lansmont compression tester, TAPPI T810 Mullen burst tester; statistical basis: 10-specimen average, dimensional tolerance \u00b10.15 mm. TadaPack publishes expected tolerance envelopes per dieline; actual lot certificates accompany every order.<\/p>\n<\/aside>\n<h2>4. Lightweighting SOP: 4-Step Flute &amp; Board Down-Specification<\/h2>\n<ol>\n<li><strong>Step 1 \u2014 Baseline the true column load.<\/strong> Map pallet pattern and warehouse stack height; compute per-box column load including pallet weight distribution. Use the stacking calculator at <a href=\"https:\/\/tadapack.com\/tools\" target=\"_blank\" rel=\"noopener noreferrer\">tadapack.com\/tools<\/a>. Tolerance discipline: box dimension variance must hold within \u00b10.15 mm on the CAD dieline or Z and hence McKee BCT shift by up to \u00b11.5%.<\/li>\n<li><strong>Step 2 \u2014 Apply the moisture derating factor.<\/strong> Select 0.65 for tropical\/monsoon-season Pacific lanes, 0.75\u20130.80 for North Atlantic temperate lanes. Confirm liner Cobb 60 \u226430 g\/m\u00b2; above that, either upgrade to wet-strength additive liner or revise the derating factor downward.<\/li>\n<li><strong>Step 3 \u2014 Down-spec one variable at a time.<\/strong> Options in order of cost impact: (a) reduce liner gsm (e.g., 200 \u2192 175 gsm kraft, ~9% ECT loss), (b) C-flute \u2192 B-flute where stacking (not drop) governs, (c) eliminate double-wall if derated BCT margin &gt;35%. Hold die-cut registration at \u00b10.15 mm and creasing matrix hardness matched to the 45-durometer creasing rule profile to prevent flute fracture at the score line during down-speccing.<\/li>\n<li><strong>Step 4 \u2014 Re-verify and lock the spec.<\/strong> Run ASTM D642 compression, ISTA 3A drop sequence, and Cobb 60 absorption on the new construction; freeze the dieline in the CAD master and require a lot certificate per shipment. Document per FTC Green Guides (16 CFR Part 260) any recyclability claims \u2014 PFAS-free barrier coatings keep the box kerbside-recyclable under PPWR rules.<\/li>\n<\/ol>\n<h2>5. Corridor-Specific Logistics Stress Matrix<\/h2>\n<table border=\"1\" style=\"border-collapse:collapse;width:100%;font-size:14px;\">\n<tbody>\n<tr style=\"background:#f1f5f9;\">\n<th>Corridor \/ Hub<\/th>\n<th>Dominant Stress<\/th>\n<th>Engineering Mitigation<\/th>\n<th>Governing Standard \/ Test Protocol<\/th>\n<\/tr>\n<tr>\n<td>Trans-Pacific \u2192 Inland Empire (FBA ONT8 \/ LGB3)<\/td>\n<td>Container sweat (30-day transit), 45\u00b0C container headspace; then dry inland warehousing<\/td>\n<td>Cobb 60 \u226430 g\/m\u00b2 liner; derating 0.65; avoid overnight RH swings &gt;30 points at cross-dock<\/td>\n<td>TAPPI T441 \/ ISO 535 \/ ISTA 3A<\/td>\n<\/tr>\n<tr>\n<td>Trans-Atlantic \u2192 Port of Rotterdam multimodal rail\/road<\/td>\n<td>Intermodal shock (rail coupling), high coastal RH then EU dry warehouse<\/td>\n<td>Derating 0.75; corner reinforcement (double-cut corner posts); stack derate 0.85 inland Rotterdam\u2013Milan corridor<\/td>\n<td>ISO 12048 \/ ASTM D4169 \/ EU PPWR (2024\/1991)<\/td>\n<\/tr>\n<tr>\n<td>DFW Texas distribution triangle<\/td>\n<td>Heat aging (summer interior trailers &gt;60\u00b0C), low ambient RH<\/td>\n<td>Low-derate 0.85 stacking but verify adhesive creep at temperature; heat-resistant starch adhesive spec<\/td>\n<td>ASTM D642 \/ TAPPI T810<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Key principle: coastal ports (Long Beach, Rotterdam) demand the harshest humidity derating, while inland dry hubs (Dallas\u2013Fort Worth, Munich) shift the governing failure mode from moisture-softened buckling toward thermal adhesive creep and vibration-induced liner abrasion.<\/p>\n<h2>6. Defect Diagnostics &amp; Troubleshooting Matrix<\/h2>\n<table border=\"1\" style=\"border-collapse:collapse;width:100%;font-size:14px;\">\n<tbody>\n<tr style=\"background:#f1f5f9;\">\n<th>Defect<\/th>\n<th>Root Cause<\/th>\n<th>Corrective Action (Floor Level)<\/th>\n<\/tr>\n<tr>\n<td>Flap popping \/ bow after gluing<\/td>\n<td>Excess glue line (&gt;0.10 mm) plus crease depth mismatch; moisture regain post-conversion<\/td>\n<td>Re-set crease matrix depth to 0.3\u20130.5 mm above male rule; cap glue application; inspect 45-durometer crease rule wear every 250k impressions<\/td>\n<\/tr>\n<tr>\n<td>Adhesive debonding after ocean transit (delamination at flute tips)<\/td>\n<td>High Cobb 60 liner + inadequate wet-strength starch; container sweat at &gt;90% RH<\/td>\n<td>Specify wet-strength additive (\u226515% wet-tensile retention), reduce Cobb 60 to \u226430 g\/m\u00b2, add desiccant or VCI panel at 1 unit per 2 m\u00b3 container volume<\/td>\n<\/tr>\n<tr>\n<td>Pallet-stack buckling at warehouse (not in lab)<\/td>\n<td>Derating factor omitted from spec; overhang &gt;6 mm beyond pallet edge cutting effective Z load path<\/td>\n<td>Re-run McKee with derating; enforce pallet overhang \u22646 mm; rotate board lot \u2014 recycled-fiber ECT variance lot-to-lot can be \u00b110%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>TadaPack&#8217;s custom structural packaging service provides CAD dieline prototyping with true-scale mockups in 3\u20135 working days, letting procurement teams validate a down-specced construction against ASTM D642 before committing to a full production PO. Start the sizing workflow at <a href=\"https:\/\/tadapack.com\/tools\" target=\"_blank\" rel=\"noopener noreferrer\">tadapack.com\/tools<\/a>.<\/p>\n<section class=\"authority-references\" style=\"margin-top:36px;padding:20px 24px;background:#f8fafc;border-top:2px solid #e2e8f0;border-radius:6px;\">\n<h3 style=\"margin-top:0;font-size:16px;font-weight:700;color:#0f172a;\">References &amp; Standards Cited<\/h3>\n<ol style=\"margin:10px 0 0 0;padding-left:20px;font-size:13px;color:#475569;line-height:1.8;\">\n<li>\n      <strong>Packaging World (PMMI Media Group)<\/strong> \u2014 Technical Guidelines and Testing Benchmarks. Accessible via official authority repository: <a href=\"https:\/\/www.packworld.com\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#2563eb;text-decoration:underline;\">https:\/\/www.packworld.com\/<\/a>\n    <\/li>\n<li>\n      <strong>TadaPack Packaging Engineering Laboratory<\/strong> \u2014 Empirical field validation data, McKee BCT calculation models, and production line tolerances (#TP-QC-Standard).\n    <\/li>\n<\/ol>\n<\/section>\n<\/article>\n<section class=\"topic-cluster-links\" style=\"margin-top:28px;padding:16px 20px;background:#f8fafc;border-left:4px solid #2563eb;border-radius:6px;\"><h3 style=\"margin-top:0;font-size:17px;color:#1e293b;\">Recommended Engineering Reading<\/h3>\n<ul style=\"margin-bottom:0;padding-left:20px;color:#3b82f6;line-height:1.7;\">\n<li><a href=\"https:\/\/tadapack.com\/news\/pack-expo-preview-24-48h-custom-printed-prototypes-specs-tolerances\/\" target=\"_blank\" rel=\"noopener\">PACK EXPO Preview: 24-48h Custom Printed Prototypes [Specs &#038; Tolerances]<\/a><\/li>\n<li><a href=\"https:\/\/tadapack.com\/news\/pack-expo-playbook-right-sized-corrugated-mono-material-cartons-ista-3a-specs\/\" target=\"_blank\" rel=\"noopener\">PACK EXPO Playbook: Right-Sized Corrugated &#038; Mono-Material Cartons [ISTA 3A Specs]<\/a><\/li>\n<\/ul><\/section>\n<section class=\"tools-recom-box\" style=\"margin-top:24px;padding:20px;background:#f8fafc;border:1px solid #e2e8f0;border-left:4px solid #2563eb;border-radius:8px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\"><div style=\"display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;flex-wrap:wrap;gap:8px;\">\n<h3 style=\"margin:0;font-size:16px;font-weight:700;color:#0f172a;\"><span style=\"color:#2563eb;font-weight:700;\">[TOOLS]<\/span> Featured Engineering &#038; Calculation Tools<\/h3>\n<a href=\"https:\/\/tadapack.com\/tools\" target=\"_blank\" rel=\"noopener\" style=\"font-size:13px;color:#2563eb;text-decoration:none;font-weight:500;\">Explore 70+ Packaging Tools \u2794<\/a><\/div>\n<div class=\"tools-grid\" style=\"display:grid;grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));gap:14px;margin-top:10px;\"><a href=\"https:\/\/tadapack.com\/tools\/box-compression-calculator\" target=\"_blank\" rel=\"noopener\" class=\"tool-card\" style=\"display:flex;flex-direction:column;justify-content:space-between;background:#ffffff;border:1px solid #e2e8f0;border-radius:8px;padding:16px;text-decoration:none;color:inherit;transition:all 0.2s;\">\n<div><span style=\"display:inline-block;font-size:11px;font-weight:600;color:#2563eb;background:#eff6ff;padding:3px 8px;border-radius:4px;margin-bottom:8px;\">BCT &#038; Stacking<\/span>\n<h4 style=\"font-size:15px;font-weight:700;color:#1e293b;margin:0 0 6px 0;line-height:1.4;\">Box Compression (BCT) Calculator<\/h4>\nPredict box compressive limit and stacking safety factors via McKee formula.\n<\/div>\n<div style=\"display:flex;align-items:center;justify-content:space-between;margin-top:14px;padding-top:10px;border-top:1px dashed #f1f5f9;font-size:12px;color:#2563eb;font-weight:600;\"><span style=\"color:#10b981;background:#ecfdf5;padding:2px 6px;border-radius:3px;font-size:11px;font-weight:500;\">100% Free<\/span><span>Calculate Online \u2794<\/span><\/div>\n<\/a><a href=\"https:\/\/tadapack.com\/tools\/edge-crush-test-calculator\" target=\"_blank\" rel=\"noopener\" class=\"tool-card\" style=\"display:flex;flex-direction:column;justify-content:space-between;background:#ffffff;border:1px solid #e2e8f0;border-radius:8px;padding:16px;text-decoration:none;color:inherit;transition:all 0.2s;\">\n<div><span style=\"display:inline-block;font-size:11px;font-weight:600;color:#2563eb;background:#eff6ff;padding:3px 8px;border-radius:4px;margin-bottom:8px;\">ECT Testing<\/span>\n<h4 style=\"font-size:15px;font-weight:700;color:#1e293b;margin:0 0 6px 0;line-height:1.4;\">Edge Crush Test (ECT) Calculator<\/h4>\nCalculate linerboard ring crush and composite ECT ratings for optimal board specs.\n<\/div>\n<div style=\"display:flex;align-items:center;justify-content:space-between;margin-top:14px;padding-top:10px;border-top:1px dashed #f1f5f9;font-size:12px;color:#2563eb;font-weight:600;\"><span style=\"color:#10b981;background:#ecfdf5;padding:2px 6px;border-radius:3px;font-size:11px;font-weight:500;\">100% Free<\/span><span>Calculate Online \u2794<\/span><\/div>\n<\/a><\/div><\/section>\n<p><!-- ========================================= --><br \/>\n<!-- Google & AI GEO Schema.org Structured Data --><br \/>\n<!-- ========================================= --><br \/>\n<br \/>\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Engineering review of ASTM D642, ISO 12048, TAPPI T811 ECT methodology and McKee BCT calculations for lightweighting corrugated ocean freight packaging.<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-4013","post","type-post","status-publish","format-standard","hentry","category-materials-and-processes"],"_links":{"self":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/posts\/4013","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/comments?post=4013"}],"version-history":[{"count":0,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/posts\/4013\/revisions"}],"wp:attachment":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/media?parent=4013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/categories?post=4013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/tags?post=4013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}