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Northstar Polymers, LLC

3444 Dight Avenue So.

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009




Northstar Polymers, LLC is a member of Polyurethane Manufacturers Association.


Copy right reserved by Northstar Polymers, LLC 2000 - 2007.  Northstar Polymer prohibits duplication of the contents of this web site for the purposes of public display and/or using on another web site without a written authorization by Northstar Polymers, LLC.




 Data Sheet


This high performance PTMEG polyether system is one of a family of polymer systems developed by Northstar Polymers for demanding work environments.  Urethane elastomers molded with this system exhibit high rebound or “High Energy”.  The high rebound combined with its low coefficient of friction, yields elastomers with outstanding abrasion resistance.  They also meet the requirements of 21 CFR 177.1680, FDA direct dry food contact.  This combination of features makes elastomers molded from MGB-A90A perfect for many applications including the handling of mined materials, wood chips, grain, gravel, sand, and other very fine particle-size, sliding commodities, and many custom applications.  This product is recommended for long-term use in constant aqueous environments.


Typical Physical Properties



Physical Property



Typical Value

Durometer Hardness:

D 2240

Shore A 90

Modulus (psi):



100% Elongation:

D 412


Tensile Strength (psi):

D 412


Ultimate Elongation (%):

D 412


Tear Resistance (pli)



Die C:

D 624



D 624


Taber Abrasion (mg loss):

D 4060


Bashore Rebound (%):

D 2632





Curing Agent:



 Typical Processing Conditions



Curing Agent:


Catalyst Type:


Catalyst Level:


Prepolymer Temperature (ºF):

180 - 200

Curing Agent Temperature (ºF):


Mold Temperature (ºF):

180 -200

Pot Life*(minutes):

2.5 - 3.0

De-mold Time*** 200 °F (minutes):

25 - 35

Complete Cure Cycle*** 180 °F (hours):


 *          Defined as:  a 300 gram sample is too thick to pour. 

**        Defined as:  no string of urethane develops when touched.

***      The use of catalyst will increase the rate of cure, but will decrease Pot Life.



Typical Mixing Ratio



                                         Prepolymer (A)             Curing Agent (B)


Code Number:                          MGA-048                 BNA-005


Specific Gravity:                          1.070                     1.017


Equivalent Weight:                       483                        45


Stoichiometry:                            1.00                       0.95


NCO/OH Index:                            1.05                       1.00


Weight Pph:                                91.9                       8.1


Weight Ratio:                              1.000                     0.089


Weight Ratio:                              11.298                    1.000


Volume Pph:                                91.5                       8.5


Volume Ratio:                              1.000                     0.093


Volume Ratio:                              10.736                    1.000


The actual mixing ratio at the operation may need to be adjusted based on the actual stoichiometric ratio calculation.  For machine mixing, calibration of the metering system is recommended before the new batch of raw material is used.                                                    



Northstar Polymers, LLC

3444 Dight Avenue South

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009




Notice: All of the statements, recommendations, suggestions, and data concerning the subject material are based on our laboratory results, and although we believe the same to be reliable, we expressly do not represent, warrant, or guarantee the accuracy, completeness, or reliability of same, or the material or the results to be obtained from the use thereof, neither do we warrant that any such use, either alone or in combination with other materials, shall be free of the rightful claim of any third party by way of INFRINGEMENT or the like, and NORTHSTAR POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE.