7/23/2019 Glossary and Basic Review of Polyurethanes

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Glossary and Basic Review of PolyurethanesPolyols:

Hydroxyl Number (OH Number) : expressed in mg KOH/g, represents the relative contentof hydroxyl groups in one gram of polyol as determined by titrating the polyol against KOH.Lower hydroxyl numbers indicate longer polyol chain lengths and higher molecular weight.unctionality is based on the initiator used in the polyol manufacture

!uivalent "ei#ht: the mass of a compound per reactive site. !n polyols, this number is"an average since polyols are polymers with a range of molecular weights, functionalities, andhydroxyl values.

 #$uivalent %eight &'(,)**+

OH -umber  +'(,)** represents the molecular weight of KOH in mg/mole

!uivalents of a polyol: represents the reactive sites available to react with an e$ualnumber of isocyanate #$uivalents

#$uivalents of "olyol &0ass of "olyol

#$uivalent %eight

$olecular "ei#ht 0%: average of a polyol is determined by multiplying the e$uivalent

weight by the functionality.

0% & #$uivalent %eight x unctionality

Polyol %y&es offered by %ri'iso:

"olyether "olyols

 "olytetramethylene glycol "olyols "10#2

 

High "erformance "olyester "olyols "olycaprolactones

 High "erformance "olyester "olyols 3astor

4uper Hydrophobic "olyols

"olycarbonate 5iols

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socyanates: socyanate !uivalent "ei#ht& number of grams of an isocyanate or prepolymer in orderto have one e$uivalent of isocyanate groups -3O. One e$uivalent of -3O groups & 67.*7grams 

N*O: represents the weight percent of an isocyanate or prepolymer comprised of -3O.

8-3O &67*7+

-3O #$uivalent %eight

  +67*7 represents the molecular weight of -3O in mg/mole

 +unctionality : represents the number of -3O groups per isocyanate or prepolymer.1ypically, lower functionality yields less crosslin9ing, which results in more flexible, softerproducts, and higher functionality yields higher crosslin9ing and resulting stiffer, harderproducts. %y&es of socyanates offered by %ri'iso:

0ethylene diphenyl diisocyanate 05! and 1oluene diisocyanate 15!

 Hexamethylene diisocyanate 1rimer H5! 1rimer

"lease contact your 1riiso 1echnical 4ales ;epresentative if you would li9e additionalinformation or samples of any of the polyols or isocyanates offered by 1riiso. <lternatively,please send an email to  jscott@tri-iso.com