Engineered for warehouse efficiency, supermarket operations, and retail display optimization.
Modern global supply chains depend heavily on cold storage efficiency. As pharmaceutical distribution, biological processing, and frozen food e-commerce expand, the demand for specialized, custom OEM freezer racking has reached unprecedented heights. Unlike standard ambient storage systems, freezer racking must withstand extreme thermal contraction, high relative humidity, and constant physical impact from heavy loading vehicles operating in confined sub-zero spaces.
Operating continuously at temperatures ranging from 0°C to -40°C (and down to -80°C for ultra-low temperature medical biological environments), the structural steel used in cold room rack structures is prone to low-temperature embrittlement. Standard carbon steels lose their ductility and become susceptible to sudden brittle fractures when exposed to these environments. Thus, high-performance OEM custom solutions utilize premium, alloy-controlled structural steel designed to absorb stress and prevent structural failure under load.
"Structural safety in cold chain environments is not just a layout concern; it is a materials science imperative. Minimizing structural failure risks under thermal stress is the fundamental engineering benchmark of DuraRacks."
Established in 2014, Nanjing Dulis Warehouse Equipment Co., Ltd. (operating globally under the brand DuraRacks) is a premier industrial rack manufacturer headquartered in Nanjing, China. Boasting over 12 years of industry experience and 9 years of direct export experience, our facility spans a modern industrial building area of 38,000 square meters.
We specialize in high-capacity pallet racking, drive-in systems, and automated storage solutions, generating an annual export revenue of $32 million USD. By integrating structural engineering expertise with modern processing lines, DuraRacks delivers customized solutions that ensure maximum space utilization, robust weight distribution, and unmatched structural durability in demanding environments.
Our engineering output, facility footprint, and supply chain strength by the numbers.
From raw material inspection to automated powder coating, discover how we build reliability into every custom steel profile.
How our dedicated engineering team utilizes predictive analysis and advanced tooling to tailor racks for specialized environments.
Driven by an experienced team of 68 R&D engineers, DuraRacks delivers advanced structural Finite Element Analysis (FEA) to simulate load, thermal contraction, and high-impact conditions before physical assembly.
We produce custom CAD and BIM warehouse layout simulations that integrate into existing logistics infrastructure, ensuring optimal clearance and compatibility with Automated Guided Vehicles (AGVs).
Our seismic load engineering, custom powder-coating finishes, and specific beam profile dimensions help prevent structure collapse. Last year, our team launched 85 new product innovations and patented racking components.
Quality and structural integrity form the bedrock of our manufacturing philosophy. Our dedicated team of 45 certified QA personnel implements rigorous quality control processes aligned with ISO9001, CE, and FEM standards. Every batch undergoes comprehensive product inspection methods to guarantee safety in sub-zero environments, including:
Supported by a robust network of over 1,200 qualified supply chain partners, DuraRacks operates as an integrated direct-export manufacturer. Our primary overseas markets encompass North America, Western Europe, and Australia.
We serve a diverse portfolio of client types, primarily catering to:
How DuraRacks leverages proximity to steel hubs, regional clusters, and integrated direct export infrastructure to control cost and quality.
Operating within Nanjing's major industrial corridor gives us direct access to high-grade steel manufacturers. This integration minimizes shipping costs for raw metals and provides price stability during raw material fluctuations.
With 68 engineers and tooling machinery on-site, we reduce the time required to design, prototype, and tool customized OEM beam profiles. What typically takes months, we deliver in weeks.
Nanjing’s inland port and close links to Shanghai Port enable flexible shipping routes. By handling logistics in-house, we secure container space and offer direct freight forwarding to North American, European, and Australian hubs.
We design our products to meet the safety regulations and structural demands of global markets.
In the United States and Canada, storage structures must comply with RMI (Rack Manufacturers Institute) and regional building codes. DuraRacks structures undergo calculation reviews and testing to meet local specifications, including seismic performance and safety factors. In Western Europe, our engineers use FEM 10.2.02 codes and EN 15512 specifications to design systems that handle regional warehouse profiles and automated vehicle clearance requirements.
For Australian clients, all racking solutions are designed, analyzed, and manufactured to meet AS4084-2012 (Steel Storage Racking) standards. This includes checking steel physical property limits, verifying deflection bounds, and ensuring proper base plate size to manage local building requirements.
How the transition toward automation and energy efficiency is shaping the design of sub-zero storage systems.
Rising energy costs in freezer operations demand higher storage density. Automated Storage and Retrieval Systems (ASRS) and Radio Shuttle systems minimize cold air volume loss and maximize space usage, reducing operational costs.
Innovations in electrostatic powder coatings now feature antimicrobial properties and enhanced chemical resistance. These features prevent corrosion caused by sanitization agents in pharmaceutical and food-grade cold rooms.
Integrating strain gauges and smart sensors directly onto structural rack columns allows operators to monitor structural load variations and identify damage in real time, preventing unexpected failures.
Expert insights on choosing materials, finishing surfaces, and managing installation standards for industrial cold chain applications.
Freezer storage systems operate in sub-zero environments, which can trigger low-temperature embrittlement in structural carbon steel. Standard steel alloys lose their impact resistance and ductility in these temperatures, making them prone to sudden brittle fractures when struck by forklifts. DuraRacks utilizes Q235B, Q355B, and HSLA steels with controlled chemical compositions. These alloys maintain their structural properties and resist fracture at temperatures down to -40°C.
To prevent rust from condensation cycles, our manufacturing process includes mechanical shot-blasting. This removes all mill scale and surface oxides before coating. We then apply an electrostatic, thermosetting powder coating system that is cured at high temperatures. This creates a cross-linked finish that resists peeling and moisture penetration. For environments with high humidity or exposure to chemicals, we also offer hot-dip galvanized and stainless steel options.
For Western Europe, rack designs must meet FEM 10.2.02 and EN 15512 design standards. For North America, racking must comply with RMI (ANSI MH16.1) guidelines and local building codes, especially regarding seismic design. DuraRacks utilizes a quality assurance team of 45 certified inspectors to verify that all systems meet the safety and load requirements of these major global markets.
Finite Element Analysis (FEA) allows our engineering team to simulate complex load distributions, seismic forces, and structural stress on virtual rack designs. By analyzing stress concentrations in CAD software, we optimize profile thickness and reinforce high-stress connection points before fabrication. This ensures that customized, non-standard racking components perform reliably in real-world applications.
Our high-capacity automated storage configurations can handle loads exceeding 2,000 kg per pallet level and reach structural heights of up to 30 meters. Each system is engineered to handle dynamic loads from automated crane movements while maintaining structural tolerances, ensuring safety for robotics integration.
The choice depends on your inventory mix and turnover rate. Selective Pallet Racking offers direct access to every pallet position, which is ideal for high SKU counts and fast rotation. Drive-In Racks provide high-density storage by allowing forklifts to drive inside the bays, which is better for low SKU counts and First-In, Last-Out (FILO) inventory flow. We can help you analyze your operations to determine the most cost-effective configuration.
Engineered for warehouse efficiency, supermarket operations, and retail display optimization.
DuraRacks
