Polytan 4F closed system corrosion inhibitor
Comes in 25KG drum (Liquid chemical)
- Traditional Tannin based Corrosion Inhibitor
- Very cost effective
- For large, predominantly steel systems
- Excellent protection
- Protects steel, cast iron, copper, brass
- Not suitable for aluminium
- Suitable for chilled water, LTHW, MTHW and HTHW systems
Polytan 4F is a traditional tannin based corrosion inhibitor which provides very cost effective treatment for large, predominantly steel closed chilled water and heating systems. It has a dark brown colour which means that an indication of the level of protection can be gauged simply by looking that the colour of the water. It is most commonly used as top-up treatment for systems that are already treated with a tannin based inhibitor. For new installations Corroban 41 or Corroban 50 are generally preferred.
It should not be used in systems which contain aluminium or galvanised steel.
1 litre / 1000 litres of system water and make-up
Normal treated water control limits
pH 8.5 – 10.5
Tannin: 12 – 20
TDS: 2000mg/l max. (1000 max for MTHW & HTHW)
TVC: 103 cfu/ml max.
How to use it
Polytan 4F should be added to the system at an initial dosage rate of 1 litre/ 1000 litres of system water content whenever the system is drained or loses a significant quantity of water then the additional Polytan 4F should be added at the rate of 1 litre / 1000 litres of water added.
The active inhibitor reserve can be measured using a simple Tannin closed system testkit.
In order to control potentially problematic microbial contamination it is recommended for chilled water and LTHW applications that the system is also dosed initially with Biocide ITA at the rate of 200 – 500ml / 1000 litres and that is repeated once every 3 months. The microbial activity (TVC) in the system can be monitored using microbial dipslides.
It is generally recommended that new closed systems are pre-commission cleaned prior to adding a corrosion inhibitor – our product Corrosperse 84 is ideal for this and can also be used to restore heat transfer and flow to older systems.
Chemical addition is made easier using a chemical dosing pot.
POLYTAN 4C – A blended liquid treatment based on organic tannins, polymer sludge, conditioners and alkali. POLYTAN 4C can be used with softened or moderately hard make-up, and in many instances provides a complete balanced treatment by itself.