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Northstar Polymers, LLC

3444 Dight Avenue So.

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail: info@northstarpolymers.com



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


Copy right reserved by Northstar Polymers, LLC 2000 - 2007.








Low Cost, Bio-Base, Polyurethane Filler Gel

For Tire-Filler and Re-enterable Electric Component Filler Applications



This polyurethane casting material is developed for applications that require inexpensive liquid resin filler such as encapsulation of a large electric components or puncture-free tire for low-speed wheels such as of wheel barrows and bicycles.


This is a two-part system with a long pot-life.  Once you mix part-A and part-B component, it will stay liquid over one hour at room temperature.  The material cures to gel consistency in about 4 to 5 hours.  The material can be used in service in between overnight and 3 days depending on the physical demand.  Because of the long pot life, the required can be mixed in a mixing container then transferred into a low-pressure injection system to inject it into the filling space, such as a tire, from a narrow entrance. 


This material is made from bio-base components.  About 60% of the material is consisted of soybean oil base chemical.  There is an odor associated with the soybean oil based chemical.  It is unsuitable for applications this odor will be a problem.  Because it is largely consisted of vegetable oil based material, the material is hydrophobic and it prevents entry of moisture after it is cured.


The material does not have much of strength to hold itself together.  The cured gel consistency resembles that of Finger Jell-O.  It can be easily torn by hands. It is ideal for an application to encapsulate an electric component, which requires re-entry for repair or maintenance.  If it is used in mechanically demanding application, such as tire-filling, the material needs to be encapsulated in a strong outer structure.  The cured hardness is Shore Durometer OO 42.





Part-A:              MNA-014

Part-B:              YPX-164


Mixing Ratio:

A:B = 1: 20 by volume  (1.000 : 15.724 by weight)


Processing Temperature:


Components:                             Ambient (68 86 F)

Mold, Substrate, or Casing:        Ambient (68 86 F)


Curing Patten (at room temperature):

Pot life:                         60 90 minutes

Demolding Time:            4 to 5 hours (to become solid)

Expected Complete Cure Time: 1 to 3 days at room temperature


The Components Data



Product Code: 



Polymeric MDI


31.4 (+, - 0.5%)

Specific Gravity:

1.23 1.24

Physical State at 25 C ( 77 F):



Viscosity at 25 C

600 cps (+/- 200)  at 77 F


Store in an airtight container in a dry indoor storage at room temperature.  The material is highly sensitive to moisture.  After using the content, immediately inject dry nitrogen gas or -40 due-point dry air into the container to blanket the material then store.  Heat will accelerate the subsequent reaction within the material and shorten the shelf life of the material. Do not store at an elevated temperature.  This component material could freeze at temperature slightly below room temperature.  Consult Northstar Polymers if freezing of the material is suspected.



Product Code: 



Curing agent based on a blend of soybean polyols, polyether polyols,  and additives

Equivalent Weight:


Specific Gravity:


Physical State at 25 C ( 77 F):

Amber color liquid with strong odor.


Viscosity at 77 C

600 1200 cps


Store in an airtight container in a dry indoor storage at room temperature.  For long term storage, inject dry nitrogen gas or -40 due-point dry air into the container to blanket the material. 





Handling Information:


Part-A component (prepolymer) contains isocyanate component, which is very much sensitive to moisture.  If it is left in air, part-A will react with atmospheric moisture and ruined.  This reaction is non-reversible.  Soon after opening a can and dispensing the content, nitrogen gas or negative-40-degree-due-point dry air needs to be injected to the can to blanket the material.  Silica gel or calcium chloride desiccant filter should be installed to 55 gallon drum-vent for your drum feeding system.  The storage temperature should be at a room temperature between 65 and 90 F.  When part-A component material is reacted with a large amount of water, it may create a violent chain reaction, which could even start fire.  This material must be stored indoor where there is no chance of contact with a large amount of water.


When the containers are opened many times during the storage, small amount of moisture comes into the container and start to react with the component. This contaminated (reacted) byproduct is usually heavier than the rest of the material.  So, old material may have a settlement of this bi-product at the bottom of the container. This bi-product settlement is often thicker and cloudier. Do not mix-in this settlement.  Avoid using the settlement at the bottom of an old container. 


Part-B: If it is exposed to ambient air for a long time, it may absorb moisture. Moisture contaminated part-B material may become source of degradation or excessive bubbles in the product.  Avoid exposure of the material to air. It is recommended the material is blanketed in try nitrogen gas for a long-term storage.


The moisture contamination of part-B material may be reversible.  By heating material to 160 - 180 F and vacuuming it at about 29" Hg negative pressure for several hours will reduce the moisture level.  The storage temperature should be at a room temperature between 65 and 90 F.


Generally, all constituents of the part-B material are compatible and stay blended in homogeneously.  However, if the material is stored for a long time, some constituent may start separating within.  It is a good practice to agitate the container before dispensing if you have stored the material for a long time without movement. Avoid moisture and enfolding excess air when agitating. 




The component materials are industrial-grade chemicals.  Please keep them in a secure place and prevent access from any unauthorized individual.  The personnel who handles these materials needs to read the Material Safety Data Sheet  (MSDS) for detail information on safety and handling of the material.  The MSDS for each component is sent with the shipment of the material. 


When conducting a test or producing your parts using this material, be sure to operate in a wide-open area with good air movement, or in a well-ventilated area. Wear rubber gloves, long sleeves, and protective eyeglasses to prevent skin/eye contact of the material.  When your operation involves heating or spraying of the material, we recommend, in addition to the above, installation of a proper ventilation system and using a half-face respirator recommended for the use to prevent inhalation of the fume.  


Direct contact of polyurethane raw materials to skin/eye, as well as ingestion may lead to health problems.  No eating or smoking should be permitted at the working area.  The operator should wash hands well with soap and water after handling the materials.  Please refer to the MSDS for each component for the detailed health information.


Possible Freezing:


When part-A material is exposed to a low temperature; the constituent material may freeze and separate within.  During the cold seasons, the material may arrive frozen after traveling in a cold truck.  If you see gelling within the material after the material has arrived, it is likely the material has been frozen.  If the material has had a chance to be frozen, you need to thaw re-blend. Heat the container so that the content is about 140 160 F, then agitate content gently to re-blend before dispensing any from the container. 


For any questions, please contact Northstar Polymers.


Tel:          612-721-2911

Fax:          612-721-1009

Web Site:     http://www.northstarpolymers.com

E-Mail:       info@northstarpolymers.com





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


For any questions, please feel free to contact us:


Northstar Polymers, LLC

3444 Dight Avenue South

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail: info@northstarpolymers.com