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Food Grade Urethane.

Food Grade Urethane.

Food Grade Urethane.

(OP)

I just found that there is a food grade urethane (PU4 An acrylated poly-ester-urethane consisting of polyadipate (neopentylglycol/adipic acid) as polyol reacted with 4-4' methylenedicyclohexyl diisocyanate.)
I now plan on making the chamber of a food carrier with this material. My question: Can we still control the density? Would a low density be better for heat retention? Is making urethane food grade more expensive?
I am going that road because of the low cost molding versus injection.
Thank you.

RE: Food Grade Urethane.

Less dense or more air should insulate better.  The cost is usually higher for material that uses a special process and doesn't sell in high quantities.

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RE: Food Grade Urethane.

gilberts,
PU4 MDI polyurethanes are very expensive compared to thermoplastics (injected molded plastics) The liner I think you are requiring would have to be a solid liner and have a density of .035-.040 lb/in^3. These have a duro shore A, of 70-90 give or take. Also most urethanes will start to break down with heat and water around 140 deg F or less. There are some that will take boiling water. http://www.irproducts.com/products/iracore.html
The solid MDI polyurethanes have a typical insulation K factor of .2 (BTU*in*F I can't remember the units)

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