How long is the service life of refrigerant antifreeze? Does it need to be replaced regularly?

The service life of refrigerant antifreeze is not fixed; it depends on its composition, usage environment, and maintenance conditions. Typically, it lasts 2–5 years, and some industrial-grade products can last over 5 years with proper maintenance. The main influencing factors include:

Component stability:Common refrigerants like ethylene glycol and propylene glycol solutions gradually degrade over time due to oxidation, high temperatures, or microbial activity. Ethylene glycol tends to produce acidic substances; without sufficient corrosion inhibitors, it may corrode metal pipes. Propylene glycol is less corrosive but can still degrade when exposed to air for long periods.

Operating conditions:High-temperature environments (such as industrial cooling) or high-load scenarios accelerate solution degradation. In low-temperature settings, insufficient concentration leading to freezing can damage the solution structure. Open systems (exposed to air) degrade more quickly than closed systems.

Maintenance measures:Periodic inspection pH value, concentration, conductivity, and corrosion rate are critical parameters. For example, if the pH value of an ethylene glycol solution drops below 7, adjustments are needed; a decrease in concentration requires replenishment. If excessive metal ions (such as iron or copper) are detected, it indicates system corrosion, necessitating cleaning or replacement. Regular replacement prevents equipment efficiency loss or corrosion risks caused by degraded media.

Is regular replacement necessary?

Industrial scenarios:Recommended every Testing should be done once every 1–2 years. If the indicators meet standards, the solution can be topped up or adjusted; if severely degraded (e.g., pH < 6.5 or corrosion rate exceeding limits), replacement is required. The replacement cycle is typically 3–5 years.

For residential applications (such as air conditioning and small refrigeration units):Follow the manufacturer's recommendations; generally, replacement is needed every 2–3 years, or the decision can be based on concentration tests using test strips.

Special cases:When there is a system leak, oil contamination, or water quality deterioration, the solution must be cleaned and replaced immediately.