Very weird central heating sludge/blockage - definitely not magnetite!

[Weezel]

I've got some seriously weird crap in my central heating (only been in the place a few weeks so don't know history). It looks like some form of silicone lubricant. Has anyone seen anything like it? Must have pulled out about 250ml so far. Power flush guy was at a loss as to what it was or how to flush it out properly. It seems to be mixing with magnetite to totally block some sections. Really hoping someone knows a chemical that might break it up, otherwise it looks like pipe cut out time

Pic shows when I emptied the return filter!

 

[CountryFan]

Looks the same consistency as Sentinel rapid dose leak sealer.

 

[Exedon]

Another vote for some sort of leak sealant
Needs to be flushed out!

 

[Weezel]

Powerflush guy reckoned he couldn't flush it. Any ideas what chemical I can use to break it up?

 

[jj4091]

According to google sealers are usualy made from polymer emulsions
What solvent dissolves polymers?
Common solvents used are DMF, DMSO, CHCl3, THD, DCM or mixtures of these solvents. If the polymer is insoluble in either of these, you may try using HFIP, which dissolves almost every polymer (since it is highly fluorinated).7 Sept 2014
Whether this would work in a central heating system and how much you would need or how to use it, I don't know. I think you might need a lot more research

 

[Weezel]

Yeah, was hoping someone had come across the problem and had experience of dealing with it. I'd be a bit apprehensive on filling my system with a chemical based purely on advice from Google

 

[CountryFan]

Powerflush guy reckoned he couldn't flush it.

No ideas why not

Any ideas what chemical I can use to break it up?

Don't know, but it’s a leave in product anyway Factsheet

 

[Weezel]

I'm guessing it's not actually the sentinel sealer, just looks like it. It's kind of sticky. When I opened the return filter you could see how it was blocking the mesh, plus mixing with the magnetite to form gelatinous goo. I think this is what has happened where my pipes reduce to microbore and has caused a blockage. The microbore then has compounded the power flush guy's attempts to flush it out. Hence me investigating to see if there is a chemical that might be known to break it down. A leak sealer wouldn't notrmally float around the system in a gooey mess like this surely? I'm thinking maybe the previous owner used either an unsuitable product or maybe it reacted with a product from another manufacturer? Either way, I need to get it out

 

[Deluks]

Can you try mixing that sample with various fluid to see if it will break down?
Fairy liquid, white spirit, citric acid, vehicle radiator flush?