Explore our high-performance, industry-certified product portfolio designed to optimize workflow, suppress wear, and prevent corrosion.
Understanding the critical demand for specialized barrier films in heavy manufacturing and international transit.
Rust and corrosion inflict trillions of dollars of loss annually on the global industrial sector. In components undergoing maritime transit or seasonal storage, micro-environmental humidity, atmospheric salinity, and industrial pollutants prompt swift oxidation of metallic surfaces. This damage compromises structural integrity, operational safety, and aesthetic quality. To mitigate these risks, rust preventive oils (RPOs) are employed to formulate hydrophobic, self-healing barriers that exclude moisture and corrosive species.
As a leading Chinese manufacturing exporter, Shandong Longhai Lubrication Technology Development Co., Ltd. addresses these challenges by developing tailored protective formulations. Incorporating high-grade base oils, synthetic wax-esters, and polar additives, our products ensure surface passivation and reliable barrier integrity, even under aggressive salt-spray conditions.
Global industrial supply chains require surface protective coatings that align with automated production schedules. Longhai’s rust preventive oils are engineered for seamless integration with downstream manufacturing steps. They exhibit excellent compatibility with subsequent wash cycles and stamping lubricants, preventing issues like paint cratering or adhesive failure.
Whether protecting cold-rolled steel coils during cross-ocean freight or shielding precision machined parts in automotive assemblies, our technical solutions safeguard operational continuity and maintain structural tolerance parameters.
Established in 2009 and headquartered in Zibo, Shandong, Shandong Longhai Lubrication Technology Development Co., Ltd. is a high-tech enterprise integrating research and development, production, and sales. For over 15 years, we have been deeply involved in the lubricant and anti-corrosion industries, constructing a complete industrial chain system dedicated to providing high-quality lubrication and preservation solutions for global industrial and transport operations.
Longhai Technology owns the domestic brand "Century Longhai" and maintains a strategic international partnership with the British "A Ba" series. Our products span a wide range of formulations, including diesel engine oil, gasoline engine oil, gear oil, hydraulic transmission oil, anti-wear hydraulic oil, specialized engine oil for engineering machinery, natural gas engine oil, full synthetics, automotive urea solution, antifreeze, motorcycle oil, industrial fluids, and automatic transmission oil. To provide security and peace of mind to our global clientele, all Longhai brand products are insured by PICC (China People's Insurance Company).
Advancing corrosion science through molecular barrier research, environmental compliance, and localized applications.
Traditional rust preventives often leave thick, tacky residues that are difficult to clean. Longhai's technical roadmap emphasizes molecularly thin, dry-touch coatings that measure under 2-5 microns. These micro-films provide up to 48 hours of ASTM B117 salt spray protection while dramatically reducing solvent usage and degreasing costs.
Aligning with global directives like EU REACH and China’s GB/T environmental mandates, our laboratory is scaling up biodegradable ester-based carriers. These formulations minimize volatile organic compound emissions, creating safer working environments in enclosed spraying and dipping areas.
Modern assembly lines rely on electrostatic spraying for even oil distribution. Our R&D works to stabilize the electrical conductivity and dielectric properties of our oils. This ensures consistent atomization, prevents overspray, and delivers uniform surface coverage on complex geometries.
During intercontinental shipping, metal components encounter high humidity, condensation cycles (dew point shifts), and salt-laden air. Longhai’s heavy-duty solvent-deposited rust preventive oils form a robust hydrophobic film. This film prevents moisture from penetrating to the metal substrate, protecting products during transoceanic shipping.
For stamped body panels awaiting assembly and painting, oil residues must protect against atmospheric corrosion without interfering with subsequent welding and cleaning. Our low-viscosity rust preventives are easily removed in mild alkaline wash baths, preventing paint adhesion defects.
Combining raw material security, automated blending, and high-precision filling to ensure stable delivery.
Operating a production base that spans 131 acres with an annual capacity of 200,000 tons, Shandong Longhai enjoys deep integration with regional petrochemical refiners in Shandong. This proximity ensures a reliable supply of premium base oils and additives, insulating our production schedules from global logistics disruptions.
Our facility houses automated blending lines governed by PLC systems that regulate temperature, shear rates, and component additions. This precise control ensures batch-to-batch consistency for all industrial lubricants and rust preventives.
Longhai’s automated filling lines utilize precision volumetric and gravimetric metering systems. This technology ensures high filling accuracy within a 1‰–2‰ tolerance. By stabilizing product volumes, these systems eliminate material waste during high-speed packaging runs.
Our plant upgrades have increased filling speeds by 20% to 35%, ensuring quick turnaround times for bulk export orders. Our packaging options range from 1-liter canisters to 200-liter drums and IBC totes, allowing us to adapt to diverse logistics networks.
Adhering to strict international standards to guarantee reliable performance under challenging conditions.
Quality management system certification governing all stages of product design, raw material sourcing, production, and final shipment verification.
Environmental management compliance, certifying our waste management, emission controls, and resource utilization protocols.
Occupational health and safety management certification, ensuring safe operational practices across our automated plant.
Providing custom formulations tailored to specific machinery requirements, climate zones, and performance standards.
We develop fully synthetic and semi-synthetic lubricants tailored to specific vehicle types, operating environments, and global regulations like API and ACEA.
Supporting both small-scale trial runs and high-volume blending. We accommodate diverse container types, sizes, and filling configurations.
Our on-site precision laboratories provide comprehensive diagnostic profiles, chemical analysis, and certified test certificates for compliance.
We provide full label design assistance, translation compliance, SDS sheet preparation, and transport certification to streamline your import process.
Defining target parameters, environment metrics, and base fluid specifications.
Customizing additives, corrosion inhibitors, and viscosity modifiers.
Testing under ASTM B117 salt spray, cyclic humidity, and oxidation stability.
Executing automated blending, high-precision filling, and quality inspections.
Managing port logistics, customs paperwork, and localized technical support.
Addressing common technical questions regarding film thickness, application methods, safety, and removal.
A: Solvent-based rust preventive oils consist of corrosion inhibitors dissolved in petroleum solvents. Upon application, the solvent evaporates, leaving a thin, hydrophobic protective film (oil, wax, or petrolatum) on the metal surface. These are ideal for long-term storage and overseas transit. In contrast, water-soluble or emulsifiable preventives are diluted with water to form a dispersion. These are typically used for inter-process protection within the plant because they are easier to clean and pose a lower fire risk, though they offer shorter-term protection.
A: The ASTM B117 salt spray test is an accelerated test that measures relative corrosion resistance under standardized, aggressive conditions. While there is no direct, universal conversion rate, as a rule of thumb, a formulation that withstands 48 hours of salt spray exposure generally protects parts for up to 1 to 2 years of sheltered indoor storage, or 3 to 6 months of outdoor ocean transit in enclosed wooden crates.
A: Yes, Shandong Longhai formulations are free from heavy metals such as lead, mercury, and hexavalent chromium. Our R&D team continuously refines formulations to comply with the latest EU REACH restrictions and regional VOC emission limits, facilitating smooth customs clearance for our international buyers.
A: Most of our thin-film rust preventive oils can be easily removed using mild alkaline hot washes, industrial degreasers, or hydrocarbon solvent cleaning systems. For precision parts that require subsequent bonding, we offer specialized light-oil formulations that leave minimal residue, simplifying downstream cleaning steps.
Explore our heavy-duty industrial and automotive lubricants formulated for extreme pressures, high temperatures, and reliable operation.
Our management policy is "planning big strategies, focusing on technology, creating high quality, and keeping reputation." We combine technical innovation with reliable service to build long-term relationships with partners worldwide.
Our philosophy is "dare to explore, innovate continuously, survive by quality, and promote development by efficiency." We work to earn market share through competitive pricing and reliable quality, driven by research and supported by our domestic and international brands.
At Longhai, we believe products reflect character, quality is essential, and customer needs come first. We work with our global partners to build a reliable supply chain for the future.
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