lubricating a woodburner


I have a metal (cast iron??) wood burner (bow front with a witches hat type top). Last year I had a major ingress of water and now the sliding doors are getting difficult to open as it looks like rust is setting in. There's a lever and linkage that open the doors. I need to lubricate the opening mechanism but I'm a bit concerned about slapping on anything with a low flash point as when it's loaded up a fair bit of heat is kicked out.
Any ideas on what I can use to lubricate the doors and related mechanism ?
cheers
Neil
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High temperature graphite grease.
http://www.mgocaccessories.co.uk/acatalog/MGOC_Accessories__Grease_176.html
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Lifted from: http://www.victorian-society.org.uk/adv8.html
What is the best finish for a cast iron grate? Use Liberon Iron Paste or Zebo polish (available from paint shops, ironmongers and DIY stores). Apply the polish sparingly and buff up the surface with lots of elbow grease. A low-effort alternative is to paint the grate with 'stove black' paint, which is specially formulated to resist heat.
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BigWallop wrote:

Err, you have mis-read that web page. If people stuck to what they know things would be better! If the cast iron (CI) is rusty, tap thick scabby rust deposits fairly gently with the tip of a small cold chisel to break them off. Wire brush to remove surface rust. N.B. sooty rust in cuts stings like hell! Dismantle and wire brush the closer linkage. Nothing should really need lubricating, it is probably just a build-up of corrosion that's preventing easy use. You can use (as mentioned elsewhere) graphite "polishes" to help maintain appearence, but to lubricate (should you want to) a graphite-based high temperature lubricant such as one of the ones made by Rocol would be ideal. To prevent seizure of screws etc. use Rocol J166 or similar, but not for areas "on show" 'cos it's a coppery colour and will be seen. This is a very good product indeed. You should NOT use Castrol grease graphited or similar as it is a low melting point grease (suitable for old-fashioned motorbike chains etc) and will run all over the place, and your fire will reek of burning grease. N.B. prevention is the best cure - make sure that you vacuum out if you are not using the thing for a while, brush off sooty bits where you can, too, and leave doors ajar to allow a draught to avoid condensation problems and the possibility of the thing seizing shut.
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