Download PDF of this page  Print this page
Home » Polyurethanes Polyureas » Prepolymers


Tri-iso distributes a wide range of prepolymers that allow formulators to produce high quality polyurethane and polyurea systems.  Prepolymers are reactive intermediates between monomeric Isocyanates and fullly reacted polyurethane or polyurea polymers.  Prepolymers contain reactive NCO groups which react with hydroxyl or amine groups to chain extend and crosslink the prepolymers.  

Your Tri-iso Technical Sales Representative is available to assist you in the selection of the appropriate prepolymer that will provide the specific properties you are trying to obtain. Click here to request a quote.

  Product Name  Model   
Yantai Wanhua Wannate 8678
Yantai Wanhua Wannate 8678

MDI Prepolymer, 18.1-19.2% NCO for elastomers and foams read more
Wannate 8678
View Details Button
Displaying 1 to 1 (of 1 products) Result Pages:  1 

There are several key characteristics which define what performance properties a given prepolymer will impart in a given polyurethane or polyurea system.  These characteristics include: the type of prepolymer selected (aliphatic or aromatic), the NCO equivalent weight, the %NCO, and the functionality of the prepolymer. 

Aromatic prepolymers are prepolymers where the NCO functional group is directly attached to an aromatic ring, and aliphatic prepolymers are prepolymers where the NCO functional group is not directly attached to an aromatic ring.  Aromatic prepolymers are typically less expensive than aliphatic prepolymers.  Aliphatic prepolymers are colorless,  UV stable, and transparent.

NCO equivalent weight is the number of grams of a given product that contains one equivalent of isocyanate groups (NCO).  One equivalent of NCO groups is 42.02 grams/mol

%NCO = 4202/NCO equivalent weight.

Prepolymer functionality refers to the number of NCO groups per  molecule.  Increasing the number of NCO groups results in greater crosslinking.  Greater crosslinking yields stiffer, harder products with enhanced chemical and thermal resistance.

© 2017 Site Map | Site Credits: Ecreativeworks