Sentinel X500 Inhibitor Anti-Freeze 5 Litre

Sentinel X500 Inhibitor Anti-Freeze 5 Litre


Product Code: 7126480

Ex Tax: £30.29

Sentinel X500 Inhibitor Anti-Freeze 5 Litre

  • The product is not suitable for heat transfer circuits of solar energy collector panels.
  • It is effective at preventing hydrogen gas production.
  • For best results systems should be flushed before application with: Sentinel X300 for new systems, Sentinel X400 for existing systems.
  • Sentinel X500 Data Sheet.

Sentinel X500 is a multipurpose inhibited antifreeze formulated to help control corrosion, scale, boiler noise and hydrogen gassing in all types of indirect heating systems including those containing aluminium components. The product is not suitable for heat transfer circuits of solar energy collector panels. Sentinel X500 is suitable for use in all waters, both hard and soft. The low toxicity formulation is colourless and easy to handle.


The dosage of Sentinel X500 will depend on the level of frost protection required. A dosage of 20% will prevent freezing down to -6°C, 30% will protect down to -11°C, 35% will protect down to -15°C. Further information is available upon request. A dosage of 20% or more is needed ot achieve the minimum concentration of corrosion and scale inhibitor. The Sentinel Test Kit can be used to verify that this level has been reached. To determine the precise glycol concentration, a refractometer is required.

For best results, it is recommended that systems are cleansed and flushed in accordance with BS7593; new systems and those up to 6 months old with Sentinel X300, existing systems with Sentinel X400.

If the system is already noisy due to lime scale deposits in the heat exchanger, Sentinel X200 should be added together with Sentinel X500.


Open Systems: Dose vie F&E cistern, via a by-pass feeder or use a Sentinel Dosing Vessel.
Sealed Systems: If the system is empty, add to any convenient point before filling. If full use a Sentinel Dosing Vessel to inject via the filling loop or other access point.

Normally same day dispatch


Hello - I need to purchase 10 litres of Sentinel 500X to be delivered to Maidstone in Kent. Can you please advise me of delivery times and total cost.  Will the antifreeze be with me by the 14 October;  I need to take it with me to France the following Monday 17th.


Thank you for your enquiry - Please find product page link for the Sentinel X500 (5 litre container)
which is a stocked item and normally next working day delivery.