TRiiSO distributes a range of aromatic polyester polyols that allow formulators to produce high performance polyurethane (PUR) and polyisocyanurate (PIR) systems. Polyols contain reactive hydroxyl (OH) groups which react with isocyanate (NCO) groups on isocyanates to form polyurethanes.

Aromatic polyester polyols provide formulators tools in their toolbox to achieve flame retardancy standards.  Additionally, aromatic polyester polyols improves insulation properties.

There are several key characteristics which define what performance properties a given polycaprolactone polyol will impart in a given polyurethane system.  These characteristics include:  the hydroxyl number or hydroxyl value  (OH value), OH equivalent weight, molecular weight, and the functionality of the polyol.
 
Aromatic Polyester Polyols Products
Hydroxyl number (OH ) is the measure of the hydroxyl group content of gram of polyol.  Hydroxyl value is measured by titrating a known mass of polyol against potassium hydroxide (KOH), and is expressed as mg KOH/g.  Lower hydroxyl values indicates lower hydroxyl content and a higher molecular weight for the overall polyol.

OH equivalent weight is the number of grams of a given product that contains one equivalent of  hydroxyl groups (NCO).  Equivalent weight = 56100/OH

Molecular Weight is determined by multiplying the equivalent weight by the polyol functionality

Polyol functionality refers to the number of OH groups per  molecule.  Increasing the number of OH groups results in greater crosslinking.  Greater crosslinking yields stiffer, harder products with enhanced chemical and thermal resistance.  Polyols that contain 2 hydroxyl groups are called diols, polyols with 3 functional groups are called triols, polyol groups with 4 hydroxyl groups are called tetrols.