In cold climates, petroleum products and bio-fuels must maintain flowability to prevent filter plugging and pump starvation. The Pour Point and Cold Filter Point Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. provides standardized measurements of the lowest temperature at which a liquid will flow (pour point) and the temperature at which solids will clog a filter (cold filter plugging point, CFPP), guiding users in selecting suitable fuels and lubricants for sub-zero conditions.

Jet fuel stability under high-temperature conditions is critical to prevent gum and deposit formation in engines and fuel-handling systems. The Jet Fuel Thermal Oxidation Stability Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. evaluates fuel performance by measuring gum formation tendencies under accelerated thermal aging, supporting fuel producers and aviation operators in maintaining fuel quality.

Contaminant particles in hydraulic fluids can damage pumps, valves, and actuators, leading to costly failures. The Hydraulic Fluid Cleanliness Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. automates particle counting and air-bubble detection to ensure fluid cleanliness meets ISO 4406 or NAS 1638 standards, safeguarding hydraulic system performance.

Oxidative degradation shortens lubricant life by forming acids, sludge, and varnish, which can impair machinery and increase maintenance costs. The Oxidation Induction Time (OIT) of Lubricating Oils Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. provides a rapid assessment of oil oxidation resistance under accelerated conditions, enabling formulators and maintenance engineers to predict service intervals and compare antioxidant packages.

Diesel fuels must not only combust cleanly but also provide adequate boundary lubrication for injectors and fuel pumps. As low-sulfur and bio-blend fuels become more widespread, their inherent lubricity can diminish, leading to accelerated component wear. The Automatic Diesel Fuels Lubricating Property Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. automates standardized wear testing to quantify fuel lubricating ability, enabling refiners and engine manufacturers to maintain injector durability and fuel-system reliability.