Premium formulations designed to satisfy exact OEM requirements and maximize thermodynamic system efficiency.
Understanding the critical shifting trends in industrial refrigeration and HVAC systems.
With the implementation of the Kigali Amendment and global F-gas regulations, the heating, ventilation, air conditioning, and refrigeration (HVAC/R) industry is undergoing a significant transition. The phase-out of HCFCs (like R22) and the restriction of high-GWP HFCs (such as R404A and R410A) have catalyzed a massive shift toward natural refrigerants (R744/CO₂, R290/Propane, R717/Ammonia) and low-GWP hydrofluoroolefins (HFOs like R1234yf and R1234ze). This paradigm shift directly impacts the tribological needs of compressor lubrication systems.
Unlike traditional mineral oils (MO) or alkylbenzene (AB) lubricants that paired perfectly with chlorine-containing refrigerants, modern eco-friendly refrigerants demand synthetic lubricants. Specifically, Polyol Ester (POE) and Polyalkylene Glycol (PAG) formulations have emerged as the industry benchmarks. As a premier Chinese manufacturer, Longhai Technology develops customized synthetic formulations that guarantee optimal miscibility, superior chemical stability, and exceptional thermal performance under extreme system pressures.
International procurement agents and OEM design engineers focus on several non-negotiable chemical metrics when securing refrigeration lubricants:
Shandong Longhai Lubrication Technology Development Co., Ltd. was established in 2009 and is headquartered in Zibo, Shandong. It is a high-tech enterprise integrating R&D, production and sales. The company has been deeply involved in the lubricant industry for more than 15 years, has built a complete industrial chain system, and is committed to providing high-quality lubrication solutions for the global industrial and transportation fields.
As a reliable lubricant manufacturer in the industry, Longhai Technology owns its own brand "Century Longhai" and the international strategic cooperation brand British "A Ba" series of products. The products cover diesel engine oil, gasoline engine oil, gear oil, hydraulic transmission oil, anti-wear hydraulic oil, special engine oil for engineering machinery, special oil for natural gas, full synthetic oil, automotive urea solution, antifreeze, special engine oil for motorcycles, industrial oil, automatic transmission oil and many other lubricant varieties. The brand is insured by PICC China People's Insurance Company and quality insurance.
Strict compliance with global standards, ensuring flawless operation under extreme thermal loads.
The company has passed ISO-9001-2015 quality system certification, 14001 environmental management system certification, and 18001 health management system certification. Our automatic transmission fluid has also successfully obtained the prestigious Mercedes-Benz certification, laying a solid foundation for the healthy development of the company and the absolute stability of product quality.
We strictly follow international industry standards (including DIN, ASTM, and ISO parameters) and introduce foreign production processes and advanced testing technologies. This guarantees that our lubricants continue to perform excellently under extreme working pressures, effectively helping customers improve equipment efficiency, optimize COP (Coefficient of Performance), and significantly reduce maintenance costs.
How Longhai Technology leverages automation and localized integration to deliver high-quality lubricants globally.
Longhai Technology has advanced blending and fully automatic production and filling equipment. The filling production line adopts the principle of metering filling, which is suitable for filling various lubricating oils and ensures a filling accuracy of 1‰-2‰. While maintaining high filling accuracy, it increases the filling speed by 20%-35%, effectively increasing work efficiency and realizing standardized industrial production.
Longhai Technology has always insisted on innovation-driven development. Our annual R&D investment accounts for more than 5% of annual revenue. We have established strategic partnerships with leading universities and research institutions to continuously optimize lubricant formulas, drive system efficiency, and enhance environmental compliance.
Located in Zibo, Shandong—a major petrochemical hub in China—our factory has direct access to high-grade base stocks and premium additive supplies. This ensures raw material stability, minimizes production lead times, and guarantees rapid shipping to global ports, protecting international buyers from supply chain disruptions.
Optimized formulations developed to meet specific engineering challenges in diverse operating environments.
Modern automotive A/C systems, particularly in electric vehicles (EVs), use scroll compressors operating with HFO-1234yf or R134a. Our synthetic PAG oils offer unmatched dielectric resistance, preventing electrical current leakage from the high-voltage motor to the compressor casing while ensuring efficient heat transfer and low wear.
Commercial chillers and Variable Refrigerant Flow (VRF) systems rely on continuous, heavy-duty operation. Longhai's high-viscosity index POE oils form a resilient lubricating film on screw and centrifugal compressor bearings, reducing frictional drag, maintaining seal integrity, and minimizing oil carryover into the heat exchangers.
Ultra-low temperature refrigeration systems require compressor oils with low pour points to prevent oil waxing and gel formation in evaporators. Our synthetic low-temperature refrigeration lubricants guarantee smooth start-ups at temperatures as low as -50°C, ensuring uninterrupted cold chains.
Custom formulations, private labeling, and global compliance support tailored to your brand.
We develop fully synthetic and semi-synthetic lubricant formulations tailored to your vehicle/equipment requirements, climatic conditions, or target market positioning, ensuring compliance with international standards such as API, ACEA, and DIN.
Flexible Production & Scale: We support trial batches as well as large-scale production runs. Our flexible filling lines accommodate packaging sizes from small cans for automotive A/C recharging to bulk drums for industrial HVAC systems.
Certified Quality Compliance: Our operations are certified under ISO 9001 and IATF 16949. We provide third-party laboratory test reports to confirm product performance, density, viscosity index, and dielectric strength, facilitating global customs clearance.
1. Demand Analysis
2. Formula Development
3. Sample Testing
4. Production Delivery
5. After-Sales Support
Explore our top-selling lubrication formulations trusted by OEMs and industrial partners worldwide.
A look inside our modern production facilities and R&D center.
Enterprise Environment
Joint Innovation Center
Laboratory Equipment
Quality Inspection Center
Automated Storage Area
Quality Audit Presentation
Expert answers to key technical questions from procurement managers and HVAC engineers.
Polyol Ester (POE) and Polyalkylene Glycol (PAG) are synthetic lubricants designed for HFC, HFO, and natural refrigerants, but they have distinct chemical structures and application areas:
Moisture is the primary enemy of synthetic refrigeration lubricants, especially POE oils. Because POE is formed by reacting alcohol with organic acid, exposure to moisture can reverse this process (hydrolysis), breaking down the oil back into acid and alcohol. The resulting acid corrodes metal surfaces, damages winding insulation in hermetic compressors, and forms metallic soaps that block expansion valves and capillary tubes. Longhai employs advanced moisture-barrier packaging and moisture-scavenging additives to minimize this risk.
Refrigerant-oil miscibility ensures that the oil carried out of the compressor by the hot discharge gas can mix with the liquid refrigerant and travel through the condenser, expansion valve, and evaporator, eventually returning to the compressor crankcase. If the oil is immiscible, it separates and coats the inside of the evaporator tubes. Because oil has a very low thermal conductivity, this oil film acts as an insulator, reducing the system's heat transfer efficiency (COP) and potentially starving the compressor of lubrication.
Yes. Longhai's formulation laboratory has developed specialized POE and PAG lubricants optimized for low-GWP HFOs such as R1234yf and R1234ze, as well as HFO/HFC blends (like R448A and R449A). These oils are designed with optimized viscosity profiles and anti-wear additives that remain stable at high operating pressures and temperatures without causing polymer degradation within the system.
We provide a wide range of viscosity options, from ISO VG 22 to ISO VG 320. The selection of the correct viscosity grade depends on the compressor design (scroll, rotary, reciprocating, or screw), the refrigerant type, and the operating temperatures. Generally, high-load screw compressors in commercial chillers require higher viscosity grades (ISO VG 120 to 220) to ensure seal integrity and load-carrying capacity, while rotary and scroll compressors in home A/C units use ISO VG 32 to 68.
When retrofitting an older HCFC system (using mineral oil) to an HFC/HFO refrigerant (requiring POE), it is essential to flush the system thoroughly. A residual mineral oil content of less than 1% to 5% (depending on the OEM specifications) is typically required. While POE can tolerate small amounts of mineral oil without separating, high residual mineral oil levels will accumulate in the evaporator, leading to a loss of heat transfer efficiency.
The company always adheres to the management policy of "planning big strategies, focusing on technology, creating high quality, and keeping reputation", vigorously promotes the pioneering and enterprising spirit, strives to implement talent-driven factories, optimizes management, actively promotes various reforms, improves corporate quality, and successfully breaks out a path of corporate innovation and development.
Our corporate philosophy is "dare to explore, innovate continuously, survive by quality, and promote development by efficiency". We will continue to occupy the market with quality and price, drive the market with outstanding talents, drive the market with scientific innovation, and promote the market with brand advertising.
Products are character, quality is life, customer first, honest and pragmatic service tenet. In the future, the company will continue to use technological innovation as the engine and sustainable development as the cornerstone, and work with global partners to lubricate the future together!
Engineered to deliver high wear protection and structural stability in demanding industrial and transport applications.
Longhai