HOK Polyurethane or Urethane

[Iceman]

Can anyone tell me the difference between the HOK Polyurethane and Urethane beside the price? I'm assuming the Poly is more flexible? Does one hold up to UV better than the other? Thanks in advance

[X711]

Polyurethane and urethane are terms which are used interchangeably. The term polyurethane came about in the past because the predominant chemical group present in the polymer was the urethane group.

If I am not mistaken, they would be the same thing.

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[Iceman]

X711- So it's a marking thing for HOK? I've also seen the same thing in Hardwood floor covering and industrial paints. In those markets Poly is suppose to be more flexible and scuff resistance. I've been told by my in house NACE guy there can be differences but in most cases you are right the terms are used interchangeably. Since I don't have acess to the HOK formulation I can't tell, local jobber didn't know either thus the question. HOK has a UF35 (urethane) and UFC35 (Polyurethane) clears of which they have different properties listed. With the solid colors nothing is listed. Serge help please?

[Serge]

The chemistry of those products are a classified trade secret! Look at the first ingredient on the can of UC35 and you will see it's called proprietary additive (trade secret)...

So, urethane chemistry is based on the reaction of a polyol and isocyanates...so a single polyol...a soup of many types...alipathic or aromatic isocyanates...it's quite a soup and I don't think you can get a general idea of the properties by name only. In the case of HOK, it's a little reversed from general wisdom that polys are harder than urethanes...

In fact, UC is a little harder to buff when cured than UFC. Tha's why I like to reflow show pieces with UFC as I can easily re-buf them any time....

When using solid colors, I always use polyurethanes as I find them easier to re-buf when cured...I will pop the question to my sources...I will let you know...

[Iceman]

Serge- thanks- since I'm sure I'll be cutting and buffing my paint job, it makes sense to use the Poloy..