🚪 Acoustic Door Core: 28 dB – 34 dB Sound Insulation (ISO 10140) ⚡ Weight Savings: Up to 60% Lighter than Solid Wood
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28 dB – 34 dB Acoustic (ISO 10140) -60% Weight Savings Extruded Arch-Bridge Geometry

Tubular Hollow Core Door Particle Board (28mm–44mm)

The preferred engineered internal core material for modern flush doors, acoustic hotel room entrance leaves, and residential interior doors. Delivers high impact resistance, certified 28 dB to 34 dB sound insulation, and eliminates seasonal door warping.

Product Overview & Ordering Options

Tubular Hollow Core Door Particle Board is an extruded interior door infill panel engineered with horizontal cylindrical weight-reduction channels. Delivering up to 60% weight reduction compared to solid timber cores, it provides exceptional flatness, 28 dB – 34 dB airborne sound reduction (ISO 10140 acoustic standard), and eliminates door leaf warping and hinge sagging for commercial internal flush door manufacturers.

Thickness Profiles: 28 mm, 33 mm, 34 mm, 38 mm, 44 mm
Acoustic Rating: 28 dB – 34 dB Airborne Sound Insulation (ISO 10140)
Weight Savings: Up to 60% Lighter than Solid Timber or Solid Chipboard
Extruded Core Density: 340 – 420 kg/m³ (Calibrated Lightweight Geometry)
Standard Slab Formats: 2050×800 mm, 2050×900 mm, 2150×1250 mm
40'HQ FCL Capacity: 1,400 – 1,800 Door Core Slabs per Container
Tubular particle board slabs with circular channels for interior door cores
Stacked 44mm Extruded Tubular Door Slabs Showing Cylindrical Channels Panel surfaces & core details

The Arch-Bridge Mechanics Principle

Manufactured via horizontal ram extrusion, cylindrical steel mandrels create continuous parallel tubular channels through the wood particle matrix. This forms an engineered arch-bridge engineering structure network: face impact forces are dispersed across adjacent curved arches, delivering high puncture resistance (> 20 kg/cm²) while eliminating 60% of solid core weight.

Acoustic Sound Insulation: 28 dB – 34 dB (ISO 10140 / ASTM E90)
Effective Core Density: 340 – 420 kg/m³ (Calibrated Weight)
Thickness Calibrating Tolerance: ± 0.15 mm (Diamond Sanded Both Faces)
Thickness Swelling (24h EN 317): ≤ 6.0% (Zero Door Binding in Humid Air)
Request Door Core FCL Pricing & Slabs → View data sheet →

Panel Structure, Processing & Applications

Explore panel surfaces, core structures, processing and applications.

Tubular particle board slabs with circular channels for interior door cores 1. Tubular Door Core
Circular channels reduce the amount of material within the door core.
Interior flush door with an exposed tubular particle board core 2. Flush Door Assembly
Specify core dimensions to suit your door leaf construction and facing materials.
Particle board cross-section with fine surface layers and a coarse chip core 3. Particle Board Core
Fine surface particles surround a coarser wood-chip core.
Raw particle board sheets stacked and strapped on pallets 4. Pallet Packing
Specify sheet sizes, quantities and packing requirements with your order.
Acoustic & Mechanical Engineering Specifications

Tubular Door Core Technical Data Sheet (by Thickness Class)

Certified mechanical values and acoustic performance across standard international door core profiles.

Engineering Property Testing Standard 28 mm 33 mm / 34 mm 38 mm 44 mm (Heavy Duty)
Tube Diameter Factory Calibrated 18 mm 22 mm / 24 mm 27 mm 30 mm
Acoustic Sound Insulation (dB) ISO 10140 / ASTM E90 27 – 28 dB 29 – 30 dB 31 – 32 dB 33 – 35 dB
Weight per Square Meter EN 323 9.8 kg/m² 11.5 – 12.0 kg/m² 13.5 kg/m² 15.2 kg/m²
Effective Nominal Density EN 323 350 ± 20 kg/m³ 360 ± 20 kg/m³ 380 ± 20 kg/m³ 400 ± 20 kg/m³
Bending Strength (MOR) EN 310 ≥ 6.5 N/mm² ≥ 6.0 N/mm² ≥ 5.5 N/mm² ≥ 5.0 N/mm²
Surface Soundness (Adhesion) EN 311 ≥ 0.85 N/mm² ≥ 0.85 N/mm² ≥ 0.85 N/mm² ≥ 0.85 N/mm²
24-Hour Thickness Swelling EN 317 ≤ 6.0% ≤ 5.8% ≤ 5.5% ≤ 5.0%
Face Impact Puncture Resistance EN 950 / ASTM E661 ≥ 18 kg/cm² ≥ 20 kg/cm² ≥ 22 kg/cm² ≥ 25 kg/cm²
Formaldehyde Emission ASTM E1333 / EN 717-1 < 0.05 ppm (CARB P2) < 0.05 ppm (CARB P2) < 0.05 ppm (CARB P2) < 0.05 ppm (CARB P2)
Sanded Thickness Tolerance EN 324-1 ± 0.15 mm ± 0.15 mm ± 0.15 mm ± 0.15 mm

1. Door Manufacturing Assembly Guidelines

Standard automated manufacturing sequence for premium acoustic flush doors:

  • Perimeter Frame Construction: 25mm to 35mm softwood or LVL timber stiles and rails form the perimeter sub-frame, with a solid hardwood lock block inserted on the latch side.
  • Tubular Core Sizing: Slabs cut cleanly to dimension inside the frame perimeter using standard carbide or PCD saw blades.
  • Face Skin Lamination: 3mm to 6mm HDF, MDF, or veneered skins pressed onto both sides using D3/D4 PVAc or PUR adhesive under 0.4 – 0.6 MPa hot/cold pressing.
  • Hinge Weight Optimization: 60% lower deadweight prevents door hinge fatigue and sagging over 100,000 opening cycles.

2. Infill Material Performance Comparison

How tubular chipboard compares against alternative door infill cores:

  • vs. Paper Honeycomb: Honeycomb is cheap but hollow (18-22 dB), echoes loudly, and punctures easily. Tubular cores deliver solid acoustic privacy (28-34 dB) and high impact strength.
  • vs. Solid Lumber: Solid wood is 60% heavier, expensive, and subject to anisotropic seasonal moisture warping. Tubular core is dimensionally inert and stays flat.
  • vs. Solid Chipboard: Solid chipboard is excessively heavy (~25-30 kg per door leaf), causing hinge strain. Tubular core saves 60% weight while maintaining solid closing feel.
Global Ocean Freight & FCL Capacity

Tubular Door Core FCL Container Loading Data (40'HQ)

Because tubular cores are 60% lighter, containers cube out efficiently without exceeding highway weight limits.

Core Thickness Standard Slab Format Slabs / Pallet Pallets in 40'HQ Total Slabs (40'HQ) Net Timber Volume Gross Weight (40'HQ)
28 mm 2050 × 800 mm 75 Slabs 24 Pallets 1,800 Slabs 82.65 m³ (Volume Cap) ~17.6 Metric Tons
33 mm 2050 × 800 mm 65 Slabs 24 Pallets 1,560 Slabs 84.47 m³ (Volume Cap) ~18.0 Metric Tons
34 mm 2050 × 900 mm 60 Slabs 24 Pallets 1,440 Slabs 90.35 m³ (Volume Cap) ~18.2 Metric Tons
38 mm 2050 × 900 mm 55 Slabs 24 Pallets 1,320 Slabs 92.51 m³ (Volume Cap) ~18.8 Metric Tons
44 mm (Heavy Duty) 2050 × 900 mm 48 Slabs 24 Pallets 1,152 Slabs 93.53 m³ (Volume Cap) ~19.2 Metric Tons
34 mm Jumbo 2150 × 1250 mm 60 Slabs 16 Pallets 960 Slabs 87.72 m³ (Volume Cap) ~18.5 Metric Tons
Commercial & Engineering Q&A

Frequently Asked Questions (B2B Buyer FAQ)

Authoritative direct answers on container minimums, standards compliance, and fabrication tolerances.

Tubular cores are manufactured via horizontal ram extrusion, forming longitudinal cylindrical tubes surrounded by a dense, compacted wood particle matrix. This creates a natural 'arch bridge' engineering geometry: perpendicular face impact forces are dispersed across adjacent curved arches, achieving face puncture resistance exceeding 20 kg/cm² while eliminating 60% of solid core weight.

Finished door leaves combining our tubular particle board core with 3mm to 6mm HDF skins achieve acoustic airborne sound ratings between 28 dB and 34 dB (tested under ISO 10140 / ASTM E90). 28-33mm cores deliver 28-30 dB for residential bedrooms, while 38-44mm cores achieve 32-34 dB for hotel guestrooms, hospital wards, and commercial executive suites.

Solid lumber cores expand and contract anisotropically with seasonal humidity fluctuations, causing door leaves to bow, cup, and jam inside door frames. Tubular particle board is an isotropic wood composite with hollow stress-relief chambers; internal hygroscopic tension is neutralized, guaranteeing flat door leaves with under 2mm deviation over a 2.1-meter height.

We produce 5 standard thicknesses: 28mm, 33mm, 34mm, 38mm, and 44mm. Standard slab widths are 700mm, 800mm, 900mm, 1000mm, and jumbo 1250mm, with lengths of 2000mm, 2050mm, 2100mm, and 2150mm. Slabs are precision-sanded to ±0.15mm tolerance for bubble-free HDF and veneer pressing. Include the finished door dimensions, skin build-up, required core size and a drawing if available. The interior door application page provides related product context.

In automated flush door assembly lines, softwood or LVL perimeter stiles and rails (25-35mm width) form the perimeter frame, with a solid hardwood lock block inserted on the latch side. The tubular core slab is placed inside the frame, and 3mm to 6mm HDF/MDF skins are laminated to both faces under 0.4-0.6 MPa hot or cold pressing with PVAc or PUR adhesive.

Because tubular cores are 60% lighter than solid board, ocean containers cube out before hitting highway weight limits. A 40'HQ container comfortably holds approximately 1,400 to 1,800 door slabs packed across 20 to 24 ISPM-15 heat-treated pallets, minimizing per-unit ocean freight costs for international door mills. List slab quantities by thickness and size and specify your destination port and packing constraints. Request a loading plan for your door-core list.

Paper honeycomb is lightweight but offers poor sound insulation (18-22 dB), hollow drum-like acoustic reverberation, and easily punctures under elbow or heel kicks. Solid timber is heavy, expensive, and warps seasonally. Tubular particle board delivers the premium solid-feel closing sensation, 28-34 dB acoustic privacy, and high durability at 40% lower cost than solid timber.

For cold-press lines with PVAc (D3) glue, apply 120-150 g/m² adhesive under 0.4-0.6 MPa specific pressure for 30-45 minutes. For multi-daylight hot presses (80°C-100°C), press time is 3 to 5 minutes. The ±0.15mm calibrated surface ensures complete adhesive contact across the entire core without telegraphing tube profiles. Include the skin material, adhesive system and intended press process in your sample inquiry. For sized components, describe your drawings and tolerances in a cut-to-size service request.

Lock In Container Load Pricing for Door Cores

For a quotation, send your finished door dimensions, core thickness and slab size, skin build-up, machining requirements, slab quantity and destination port. For samples, tell us which finish or property you want to evaluate.

Request Door Core Cutouts & Container Quote → ✉ Email Technical Sales Directly