7-Bar Blast Certified · U.S. DoD Standard

Protecting Combat Aircraft
with the World's Most Proven
Hardened Aircraft Shelter
Spall Liner System

As drone swarms and precision-guided missiles redefine modern air warfare, a certified Hardened Aircraft Shelter (HAS) with a proven steel arch spall liner is no longer optional — it is a strategic imperative. Wonder Arch delivers 7-Bar blast-certified HAS spall liner protection for fighter aircraft shelters from F-16 and F-35 class to strategic airlift platforms — manufactured in Korea to full U.S. DoD standards.

7-Bar
Blast Certified
3.2–4.5mm
Thickness Range
Custom sizes available on request
610×355mm
DoD Profile
4× DoD
Standards Met
UFC 3-340-01DoD Structural Standard
DDESB TP 15Explosives Safety Board
UFGS 05 30 00Steel Arch Liner Spec
UFC 4-211-01Aircraft Maintenance
TO 00-25-172USAF Shelter Ops
The Threat Is Real
Modern Warfare Demands
Hardened Protection

Russia-Ukraine and Middle East conflicts have proven that low-cost drones and precision missiles can repeatedly destroy multi-billion-dollar combat aircraft on open ramps. A Hardened Aircraft Shelter (HAS) with a certified steel arch spall liner is the only proven passive defense — and Wonder Arch is the world's leading HAS spall liner system, trusted by air forces across NATO-allied and partner nations.

Hardened Aircraft Shelter row
Hardened Aircraft Shelters — completed installation
Fighter aircraft in HAS
Combat aircraft protected inside HAS
Wonder Arch construction
Wonder Arch arch panel installation
Why Wonder Arch
Six Reasons Defense Forces
Choose Wonder Arch

7-Bar Blast Performance

Certified to 101.5 psi overpressure per U.S. Army Official Blast Test Reports ADP001768 / AD0886769. Full-scale verified — not simulation only.

Spall Fragment Interception

Ductile corrugated steel intercepts high-velocity concrete fragments per UFC 3-340-01 Section 10.2 — protecting aircraft and crew inside.

50% Less Material

610×355mm double corrugation achieves equivalent stiffness with 50% less steel than conventional profiles — reducing cost and construction time.

NET Certified Coating

Korea Ministry of Trade certified (No. 1560) electrodeposition over PosMAC steel. Non-conductive, Zone 2 compliant, semi-permanent durability.

Column-Free Interior

Self-supporting arch — no trusses, no columns. 100% unobstructed interior for aircraft operations and maintenance.

Total HAS Integration

From blast simulation and structural design to spall liner panel supply and blast-proof door integration — complete HAS solution through a single contact point. Blast door partner: SH Door Tech Co., Ltd. (up to 50 Bar certified).

Custom Thickness Supply

Standard military grades: 3.2mm / 4.0mm / 4.5mm (corrugation depth 355mm). Non-standard thicknesses — 1.2mm, 1.6mm, 2.0mm, 2.3mm — available upon request with minimum order quantity. Custom corrugation depths (200mm, 235mm) available for large volume orders with tooling change.

Full Catalog & Engineering Data

Complete technical specifications, FEM analysis, and the full Rexsteel product range available on our official English website.

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Technical Solution
Wonder Arch HAS Spall Liner System

Complete engineering solution for Hardened Aircraft Shelters (HAS) and protective structures — from certified 7-Bar steel arch spall liner panels to full HAS structural design, blast overpressure simulation, and protective bunker integration. Serving air forces, defense ministries, and prime contractors globally.

Product Specifications

ProductWonderArch HAS Spall Liner System
ManufacturerRexsteel co.,ltd — Republic of Korea
ClassificationUFGS 05 30 00 — Steel Arch Liner
Blast Certification7-Bar (101.5 psi ≈ 700 kPa)
Test ReportsU.S. Army Official Blast Test Reports ADP001768 / AD0886769
Profile610 × 355 mm corrugated
Bolt SpecM13 (φ12.7mm) High-Strength
Steel GradePosMAC (Mg-Al-Zn) · ASTM A653 eq.
CoatingNET Certified Electrodeposition · Zone 2
Corrosion5–10× vs. standard GI steel

Thickness — 3.2mm to 4.5mm

3.2
mm · Standard
Arch liner. Matches DDESB TP 15 "1/8-inch steel facing." F-16 / F-35 / F/A-18.
4.0
mm · Medium
Medium-large span. F-15 / Su-30 / C-130. Up to 50m span.
4.5
mm · Heavy
Rear wall spall plate. C-17 class. 50m+ span.
Custom
Special Project
Non-standard thickness (e.g. 1.2mm) available for civil/commercial aircraft shelter applications. Surface treatment and design code per project specification (Eurocode, ASTM, etc.).

Engineering Capability

Blast Load & Structural Analysis

Full structural and blast load design to U.S. DoD protective structure standards. Arch calculation, dynamic material properties, spall threshold verification.

LS-DYNA Blast Simulation

Numerical blast simulation with spall fragment interception verification. Official simulation report included in the technical package.

Partner Network

NATO/DDESB-certified blast door partner, accredited military structural research institute, and specialist military airfield engineering team — partner details disclosed upon qualified inquiry.

Technical Design Reference — NDA Required

01HAS Structural DesignNDA
02Blast Load AnalysisNDA
03Spall Liner SpecificationNDA
04Electrical Hazardous AreaNDA
05Blast Door IntegrationNDA
06MEP & Ventilation DesignNDA
07Grounding & LightningNDA
08Construction & InstallationNDA

Full design reference provided to qualified buyers upon NDA execution.

Supply Options
Three Ways to Work With Us

We match your project stage — panel supply only, or complete HAS integration.

Option A

Panel Supply

  • WonderArch panels per design spec
  • 3.2 / 4.0 / 4.5mm ex-stock
  • Full material certification docs
  • For completed-design projects
Option B

Panel + Blast Simulation

  • LS-DYNA numerical blast analysis
  • Spall interception verification
  • Official simulation report
  • For projects needing performance proof
Option C · Recommended

Total HAS Integration

  • Full structural & blast load design
  • LS-DYNA simulation report
  • WonderArch panel supply
  • Blast door partner supply
  • One contact point · complete package

Ready to Protect Your Air Assets?

Detailed engineering data, full technical catalogs, and complete product range at our official English website.

Official English Site ↗
Qualified Inquiry
Request Technical Information

Available to qualified defense procurement agencies, prime contractors, and authorized defense consultants.

Blast test parameters released only after NDA execution. Personal emails will not receive technical data.

Direct Contact

Kim Jin Woo
Director, International Sales Team — Rexsteel co.,ltd

[email protected]
Mobile: +82-10-3762-5144
Tel: +82-55-800-8901

Headquarters & Factory

344-4, Gwangjeong-ro, Haman-myeon
Haman-gun, Gyeongnam
Republic of Korea

Official English Website

Full product catalog and technical documentation.

rexsteel.kr/eng ↗
Qualified defense buyer inquiries only. Credentials verified before technical data release.
Technical Resources
Downloads & Reference Library

Technical documentation for qualified defense procurement agencies, prime contractors, and engineering consultants. Classified documents available under NDA upon verification.

Public Documents

Wonder Arch HAS System — Product Catalog 2026
Full product specifications, thickness selection guide, coating technology, and supply options. English edition.
PDF Download
Download ↓
Wonder Arch — Technical Specification Sheet
Profile: 610×355mm. Thickness: 3.2mm / 4.0mm / 4.5mm. PosMAC + NET coating. UFGS 05 30 00 compliant.
PDF Download
Download ↓
SH Door Tech Co., Ltd. — Blast-Proof Door Company Profile
Partner company brochure. Blast-proof doors rated up to 50 Bar. KGS Class 2 Level A certified. Sliding & hinged blast doors for HAS, ammunition magazines, and defense facilities. ISO 9001 & 14001, UL 10B, UL 752 compliant.
PDF Download
Download ↓

HAS Design Guide — Engineering Scope

Rexsteel co.,ltd has developed a comprehensive HAS Design Guide covering the full engineering lifecycle of Hardened Aircraft Shelter design and construction — from structural blast analysis to MEP, electrical hazardous area classification, and installation methodology. This demonstrates our complete in-house engineering capability as a Total HAS Integrator.

Ch. 1HAS Concept & Threat Environment Analysis
Ch. 2HAS Dimensions by Generation & Panel Selection
Ch. 3RC Arch Structural Design
Ch. 4Blast-Resistant Door Design
Ch. 5Electrical & Hazardous Area Classification
Ch. 6MEP & Ventilation System Design
Ch. 7Grounding & Lightning Protection
Ch. 8Fire Suppression & Safety Systems
Ch. 9Interior Wall & Spall Liner Integration
Ch. 10Construction & Installation Methodology
Ch. 11Quality Assurance & Inspection Procedures
Ch. 12Country-Specific Design Requirements
App. MWonderArch Technical Specifications
App. XBlast Door System — Full Specifications
App. YUSFK HAS Official Drawing Reference
App. LComprehensive Design Calculation Examples

More Resources on Our Official Website

Full product catalog, CSP pipeline solutions, and complete technical documentation available at our official English website.

Visit rexsteel.kr/eng ↗