GEK Wiki / Insulative Products
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Insulative Products

Page history last edited by jim mason 14 years ago

return to Practical Engineering

 

This page concerns specific insulation products: where to get them, how we've found them to perform, and what might be better but yet to be assessed.   Raw data on insulative materials and general materials is on the Insulation Data page.

 

A great starting point for understanding and sourcing a broad range of insulation materials is, as usual, McMaster Carr.  Wandering the McMaster thermal insulation section you can survey the options from low to high temp, and the related insulative performance.  Remember that in general, as tolerance to high temp increases, the insulative performance goes down.   I've copied the McMaster summary chart below showing what they have and the R values for each category.  At the link above you can go find the details of each category.

 

   
 
Insulation Material     R-value @ 1" Thick
Expanding Foam     5-6
PVC Foam     5.2-6.0
Polystyrene Foam     3.8-5.0
Polyurethane Foam     3.3-5.3
Bubble Wrap     4.2
Polyimide Foam     4.2
Polyethylene Foam     3.8-4.0
Mineral Wool     3.7-4.3
Foam Rubber     3.7-3.8
Insulation Material     R-value @ 1" Thick
Melamine Foam     3.8
Cork     3.6
Cellular Glass     3.4
Fiberglass     1.7-4.8
Silicone Foam     2.5-2.6
Ceramic     0.8-3.6
Silica     1.3
Millboard     1.0-1.4
Calcium Silicate     1.0-1.4

 

 

 

I've been buying samples of many of the options and assessing them for gasifier relevance.  Of particular interest so far are the following:

 

  • Adhesive backed ceramic rope/tape that is great for high temp flange gaskets.  Good for mounting the reduction bell, reactor, cyclone, etc.  I get the 1/8" thick by 1" wide  see mcmaster. 4057K3.
  • A 1/8" thick fiberglass paper of 16" width that will take 700C.  it is an unusually high temp tolerant fiberglass  see mcmaster  9323K21.  We are now using this to insulate the inside of the GEK gas cowling, now that we have something relevant to do with the excess outgoing gas heat (i.e. heated auger and fuel dryri).  A separate ss sheet cylinder springs it out and holds it to the wall.
  • Mineral wool tubes for pipe or auger insulation.  mcmaster 9364K22
  • Mineral wool loose fluffy for hand fill. mcmaster 9332K65
  • then the usual others: kaowool type batting, high temp mortars, pipe wraps

 

 

Other known/suggested suppliers:

  • Cotronics Corp.  see http://www.cotronics.com.  McMaster sources much of their higher temp insulation materials from Cotronics.  Lots of impressive things you likely need.
  • Aremco.  see http://www.aremco.com/ . Suggested by Cyrille Deces-Petit on the Gasification List.  Looks intereting.
  •  
  • Please add to this list

 

 

Another suggested higher temp mieral fiber insulator is Roxul.  It is good up into the 1100C range, but apparently at mineral wool prices.  See here for their data sheet.

 

 

 

 

from roger:

 

Some good insulation references can be found at: http://www.insulation.org/techs/materialspecs.pdf

 

Also at the same site is the "tech-specs" guide with ASTM specs by vendor.  Look at C 892-05 for high temp (1350F-3000F) Types.  My only industrial experience is with the Type II Thermal Ceramics product.

 

Considerable information re: insulation mechanical design can be found at:  http://www.wbdg.org/design/midg_materials.php#ppgim 

 

I'll continue to update this specific to the group's needs if someone gives me the wish list

 

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