Engine coolant performance depends heavily on the correct mixture ratio of base fluid (ethylene or propylene glycol) and water. Density is a direct indicator of mixture strength, correlating with freeze point, boil-over protection, and heat-transfer characteristics. The Density of Engine Coolants Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. provides rapid, accurate density measurements, enabling technicians to confirm coolant concentration in real time.

Refrigeration oils serve as both lubricants and heat-transfer media in closed refrigerant loops. A key property is the floc point—the temperature at which waxy or asphaltenic components precipitate into insoluble particles (“flocculate”), causing oil–refrigerant mixtures to lose lubricity and potentially clog small orifices. The Floc Point of Refrigerator Oils Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. provides precise determination of floc point, helping formulators

In hydraulic brake systems, the fluid comes into continuous contact with various metal alloys—steel, copper, brass, and cast iron. Over time, brake fluid impurities and moisture accelerate metal corrosion, leading to seal failures or abrasive particles in caliper bores. The Brake Fluid Metal Test Piece Corrosion Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. quantitatively evaluates brake fluid-induced corrosion on defined metal specimens, ensuring that fluids meet rigorous compatibility standards.

Engine coolants not only must protect against freeze-thaw damage but also prevent corrosion of critical engine components—aluminum heads, cast iron blocks, brass radiators, and solder joints. The Corrosion Test for Engine Coolants Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. provides a controlled environment to quantify metal corrosion rates in various coolant formulations, enabling formulators and end-users to ensure long-term engine protection.

Monitoring Coolant Purity with the Engine Coolant Ash Content TesterIntroductionEngine coolants (antifreeze mixtures) incorporate additives—corrosion inhibitors, pH buffers, and anti-foaming agents—that leave behind inorganic residues when the fluid is subjected to high temperatures or combustion by