Glenn

Plistix 900F Kiln Wash

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plastix 900F.jpg

Plastix 900F is painted on about like thick latex paint as a final bit of armor and IR re-reradiator. (meaning it gets really hot and radiates heat back into the forge).  IR reflective coatings are Plistix or Metrikote,

Plistix 5 pounds for $45.00

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Glenn, will this stuff stick directly to the rigidizer I have on my kaowool and how many square feet does the 5lbs cover? Thanks.

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5 pound of Plistix 900F applied at a 1/16 of an inch thickness will cover approximately 6 square feet.

The IFI gas forge discussions suggest that Plastix 900F be applied to the Kast-o-lite hard refractory to reflect heat back into the forge and improve fuel economy.

 

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I did not understand answer from above will it stick to a rigidizer on Kaowool. I have ceramafiber Ceramic Fiber Blanket - Insulation 1" thick. I sprayed it twice with Simwool Rigidizer and after Frosty & others saw my forge they suggested to use this product over existing pictures of forge I showed them & remove the fire brick I now have in there. Will this stick to my existing fiber blanket w/simwool ridigizer. I plan to apply it thick as suggested. You can see my forge pictures on a form called HELP.... I created, Any input you have will be appreciated.

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Yes, either Plistex or Matrikote will bond to ceramic fiber refractory but it's thin and brittle and even rigidized blanket isn't hard just a little stiffer. If you use either product as your hard inner liner you either have to apply several thin coats to provide rigid physical strength or learn to be very gentle with your forge. 

It's called a "kiln wash" because it's typically used as a final layer on the flame contact side of furnace/kiln liners and there are many washes and many purposes. Some act as a release agent in pottery/ceramics kilns so pottery and glazes don't stick to shelves and furniture during firing. Some glazes are chemically active at high temperatures and can attack the inside of the kiln, shelving furniture, etc.

Borax based forge welding flux is a good example of something that becomes VERY CAUSTIC at welding temperatures and literally dissolves silica based refractories. You can literally watch it eat holes in the old soft/insulating fire brick (IFB) and eventually through 3,000f hard fire brick. Toss a little on blanket refractory and it'l like throwing hot water on cotton candy. 

Rigidizer might help protect from hot borax but only a little and I don't know about the stuff you used so I can't say. 

If nothing else kiln wash the blanket but for the money I'd buy a proper 3,000 f hard refractory like Kastolite 30. (KOL) has become a consensus favorite in the last year or so as it's also an insulation so we lose less heat. It's concrete hard to it's working maximum temperature rating of 3,000f.

Frosty The Lucky.

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