pakkasöljyihin

Pakkasöljyihin, also known as winter oils or pour point depressants, are additives used in lubricating oils to improve their performance at low temperatures. Their primary function is to lower the pour point of the oil, which is the lowest temperature at which the oil will flow under standard conditions. As temperatures drop, the wax crystals present in base oils can begin to solidify and interlock, causing the oil to become too viscous or even solidify, preventing proper lubrication.

Pakkasöljyihin work by interfering with the crystallization process of the wax components. They typically do not prevent wax from forming entirely, but rather modify the shape and size of the wax crystals. This modification prevents the crystals from forming a rigid, interconnected network, allowing the oil to remain fluid at lower temperatures. Common types of pakkasöljyihin include polymers such as polymethacrylates (PMA), polyalkyl styrenes (PAS), and ethylene-vinyl acetate (EVA) copolymers.

The effectiveness of a particular pakkasöljyihin depends on the base oil formulation and the specific type of wax present. These additives are crucial for ensuring that engines and machinery can start and operate reliably in cold weather conditions, preventing damage caused by inadequate lubrication. They are widely used in automotive engine oils, hydraulic fluids, and other industrial lubricants intended for use in environments with sub-zero temperatures.