Discover our top structural innovations, featuring sound insulation, security armor, and premium WPC solutions designed for elite hospitality and residential projects.
Zhejiang Larsom Door Co., Ltd. is an industry-leading manufacturer specializing in the research, development, production, and global export of high-performance security doors, armored entry systems, steel-wood engineering doors, and custom-designed WPC interior door solutions. Since its founding, the company has remained committed to providing global building developers, architects, and wholesalers with top-tier security and waterproof door designs that meet strict international regulatory standards.
To maintain our competitive advantage, Larsom Door has invested heavily in modern production infrastructure. Our facilities are equipped with CNC laser cutting machines, high-precision bending machines, automated welding systems, high-speed turret punching machines, and state-of-the-art powder coating lines. By integrating strict quality control checks at every stage, we ensure every batch of waterproof WPC doors features exceptional dimensional stability, high chemical resistance, and premium surface finishes.
Our factory uses advanced automation to achieve tight tolerance control and clean finishes across all raw WPC and wood-engineered components.
Wood Plastic Composite (WPC) represents a major advancement in building materials, combining the aesthetic warmth of natural wood fibers with the high durability of thermoplastic polymers. In high-humidity areas like showers and commercial restrooms, traditional materials like solid wood, MDF, and standard plywood absorb moisture over time, leading to swelling, cracking, and mold growth.
Larsom’s WPC doors are engineered with a specific formulation: approximately 60% refined PVC polymer resin, 30% wood fiber dust, and 10% structural additives (including UV stabilizers, impact modifiers, coupling agents, and eco-friendly pigments). Under high pressure and temperature, these raw materials are co-extruded into a single monolithic door structure. This creates a dense, non-porous surface barrier that limits moisture absorption to less than 0.5%, compared to over 8% in standard MDF panels.
Our doors achieve a class-leading density of 1.05 to 1.15 g/cm³, providing excellent screw-holding capacity, sound attenuation (up to 28dB), and a Class B1 Flame Retardant rating in accordance with global EN 13501 standards.
| Performance Feature | Larsom Waterproof WPC | MDF / HDF Core | Solid Wood | Standard PVC Doors |
|---|---|---|---|---|
| Moisture Absorption Rate | < 0.5% (Non-porous) | 8% - 15% (Swells) | 12% - 20% (Warps) | 0% (Waterproof but brittle) |
| Formaldehyde Emission | E0 Grade (Zero Emission) | E1 / E2 (Chemical adhesives) | Natural (Negligible) | Low (Varies with polymer quality) |
| Termite & Insect Resistance | 100% Resistant (Polymers repel insects) | Low (Requires chemical treatment) | Vulnerable (Requires active protection) | 100% Resistant |
| Structural Density | 1.05 - 1.15 g/cm³ | 0.70 - 0.85 g/cm³ | 0.50 - 0.75 g/cm³ | 0.45 - 0.60 g/cm³ (Hollow/Thin) |
| Flame Retardancy | Class B1 (Self-extinguishing) | Class B3 (Combustible) | Class B3 (Combustible) | Class B2 (Melts under heat) |
Sourcing from Zhejiang Larsom Door Co., Ltd. provides distinct advantages in logistics, material chemistry, and cost optimization:
Zhejiang is the global hub for WPC material manufacturing, offering ready access to high-grade polymer resins and wood byproducts. This localized supply chain keeps our material costs stable and insulated from global market fluctuations.
We operate large-scale, automated extrusion lines that produce seamless hollow-core doors in a single pass. This continuous process reduces structural weak points and guarantees consistent quality across high-volume production runs.
Our factory in Zhejiang is located near major international shipping gateways in Ningbo and Shanghai. This allows for fast container loading, efficient customs clearance, and reduced transit times to North America, Europe, the Middle East, and beyond.
Modern commercial and residential construction demands materials that combine visual appeal with long-term durability and low maintenance. Our WPC shower and bathroom doors are engineered to solve specific regional and architectural design challenges:
High-end hotels require excellent room-to-room sound isolation and doors that resist warp under high bathroom steam levels. Larsom WPC doors, designed with hollow acoustic cavities, reduce sound transmission while maintaining their shape in humid conditions.
For large-scale public housing projects, durability and low maintenance costs are top priorities. Our WPC doors resist scratching, denting, and termite damage, which helps lower long-term replacement rates for property managers.
As prefabricated construction continues to grow globally, builders need doors that fit precise factory dimensions. We specialize in custom-sized WPC doors that arrive pre-hung and pre-drilled, ready for rapid installation.
To serve global builders, Larsom Door follows a comprehensive Quality Management System (QMS) aligned with international standards:
Every batch of polymer resin and wood fiber undergoes rigorous checking for density, purity, and moisture levels before extrusion.
Advanced CNC milling and engraving machines cut locksets, hinge pockets, and decorative designs with tolerances down to 0.1 mm.
Prior to packaging, each door panel undergoes dynamic structural checks to verify flatness, corner squareness, and surface finish.
Doors are wrapped in protective PE film, reinforced with corner guards, and packed in strong corrugated cartons to prevent damage in transit.
Find answers to frequently asked technical questions about WPC door design, physical properties, and installation methods.
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