Mayline 250

Self-sealing liquid

Self-sealing liquid for heating installations with daily leakage of up to 250 litres

Mayline 250 seals leaks of up to 250 litres per day. The self-sealing liquid is based on the principle of providing a mechanical seal from the outside. Mayline 250 only functions in the presence of oxygen and is suitable for all materials currently in use (synthetic and metallic). The product can even be used in open expansion tank systems.


Code | Package: 5/MY250 | 5 l canister
1/MY250 | 1 l (pack of 12 bottles)
Important note: Shake the container well before use. Mayline 250 can NOT be mixed with glycols, antifreezes or other chemical products. The self-sealing liquid may remain inside the system for a maximum of 30 days. Protect the product from frost.
Instructions for use: Quantify the daily leakage. Quantify the system’s contents. Bleed the pumps well after inserting the liquid! Remove or bypass all the fi lters and screens. Adjust the boiler’s maximum temperature and pressure. Open all radiator valves and mixing valves completely. Bleed the re-circulation pumps well and leave them in function. Use a loading pump to insert the necessary amount of self-sealing liquid. Bleed the re-circulation pumps again. Use the pH strips on the container to check the pH value at the system’s highest or most distance point. The pH value must be between 10.5 and 11. The system must remain in function for at least 7 hours at maximum temperature. After the sealing process has been completed, the Mayline 250 must be removed from the system. The product may remain inside the system for a maximum of 30 days. If necessary, drain the system’s water to eliminate any eventual residues.
Safety informations: In the event of eye contact, rinse eyes thoroughly with much water and consult a doctor. In the event of skin contact, rinse well with water. Wear gloves and protective eyewear. Use water to immediately remove the product from objects such as tiles, flooring, wash basins, etc. Keep out of reach of children!
Mixing proportions: Refer to the material safety data sheet (MSDS)
Mixing proportions: 1-2% (1-2 litres of Mayline 250 for every 100 litres of water). The dose is suffi cient once a pH value of 10.5 to 11 has been obtained. ATTENTION! THE PRODUCT MUST NOT BE OVER OR UNDER DOSED.
Transport: The product is not hazardous for transport. The indications are provided based on actual experience. Technical changes are possible.
Disposal: For information concerning waste disposal/effluent, please consult the corresponding safety data sheet.
Shelf life: Shelf life 5 years (from date of manufacture)

Technical Datasheet