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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.







OOO Scale Microcellular Gel Elastomer



MCG-1 is formulated for making extremely soft products.  MCG-1 has unique structure for this class of material.  The cured product will be slightly foamed and give a very soft touch, yet faster responding time than the other polyurethane gel of similar hardness range.


MCG-1 has its solid hardness range below Shore OO 1 hardness, or in Shore OOO scale range.  (See below for the hardness data.)  This allows a manufacturer to use the molded part at OOO scale without plastic film or coated fabric.  Whereas typical polyurethane gel materials have solid range between Shore OO 10 to OO 40 hardness, and if the mixing ratio is modified to obtain a softer range product, the material starts to sag like thick liquid, MCG-1 can service even lower hardness range without being liquid.


Another property that is unique to this gel is that since it contains some bubbles inside, it has a property to contract down from the original volume when a deflection force is applied.  Regular gel materials do not contract within the same space and need expansion space to deflect, thus typically they are not appropriate for upholstery application.  MCG-1 contracts up to a certain point without needing expansion space, thus it can be used as upholstery and bedding applications conveying its softness.


The cured part can be directly covered with Spandex type fabric; this allows your part to directly convey the softness of the gel.  


Suggested applications include:


  • Cushioning and padding parts for sporting goods and medical devices

  • Upholstery application

  • Human-fat simulating products (for doll skins, external breast augmentation etc.)

  • Shock absorbing products

  • Seating products


This polyurethane gel material is formulated in such a way that the user can control/choose the hardness/deflection properties of the product.   Following is reference for the hardness to the corresponding mixing ratio.




Part-A:                                   MPA-026

Part-B:                                   PAA-033


Mixing Ratio:

               Hardness Range                     Mixing Ratio                         


Shore OOO 37                       A:B = 1:9.0 by weight

Shore OOO 40                       A:B = 1:8.7 by weight

Shore OOO 45                       A:B = 1:8.5 by weight

Shore OOO 49                       A:B = 1:8.0 by weight

Shore OOO 68                       A:B = 1:7.0 by weight



*The above hardness data is typical values and may vary depending on the various processing conditions.  Harder products have faster rebound time and deflection.    The user must calibrate the mixing ratio to the desired yielding hardness for each application. The data is reference only.


The following is the processing parameters of 1:8.5 mixing ratio, ambient temperature for the component materials and the mold.  Harder material has faster curing pattern in general.


Pot life:                                   2 to 2-1/2 minutes at ambient temperature

Demolding:                            12 15 minutes at ambient temperature

Complete Cure:                      24 hours at ambient temperature


            Processing Temperatures:

            Part-A                           Ambient

            Part-B                           Ambient

            Mold                             72 to 110 F

            Post cure                       Ambient


Part-A component is viscous at a room temperature.  If your casting machine requires lower viscosity part-A component may be heated between 100 and 160 F to lower the viscosity to help well-mixing of the components.  Normally part-B viscosity is low enough for the casting process at room temperature. 


Higher processing temperature may cause excessive shrinkage.   Test the optimum mold temperature for each application and control the processing temperature parameters for a predictable shrinkage range.


Part-A component has a small amount of dark and viscous sediment.  It is a highly cross-linked bi-product produced during our production, and we cannot remove this with our normal procedure.  The sediment can cause hard lumps in your product so it should not be used in your batch.  If the material is gravity fed by laying the drum horizontally, the head position should be elevated slightly to avoid the sediment entering the batch.  This material is heavier than the main body of part-A.  So, if the content of the drum has been agitated, wait until this sediment is sunk to the bottom of the container.


The cured surface of this product is sticky; so it is recommended the material is covered with soft fabric or flexible film material.  For temporary handling, you may use talc powder to prevent it from sticking to the handlers or equipment. In case of casting or molding, silicone release agent can be used.


Component Data:



Product Code: 



Isocyanate terminated prepolymer extended with polyether polyol


16.0% +, - 0.5%

Amine Equivalent


Specific Gravity:


Physical State at 25 C ( 77 F):



Viscosity at 25 C (77 F):

8,000 15,000 cps


Store 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 argon gas 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 above 100 F.  Avoid direct sunlight.




Product Code: 



Curing agent based on a blend of polyether polyols and additives

Equivalent Weight:

325 335

Specific Gravity:


Physical State at 25 C ( 77 F):

Viscous Liquid with slight yellow tint


Viscosity at 25 C (77 F)

700 1100 cps


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



Handling Information:




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


When you are conducting a test, or producing your parts using this material, please 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 that can emit isocyanate vapor or mist above OSHA threshold of 0.02 ppm, installation of a proper dynamic ventilation system to reduce the isocyanate concentration in air and/or using an approved half-face respirator for organic vapor as well as particulates.  Full-faced respirators with positive-pressured air supply can also be used as a protection.     


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. It is recommended that hand-washing and eye-bath facilities are established.  Please refer to the Material Safety Data Sheet for each component for the detailed health information.




Part-A component (prepolymer) contains isocyanate component, which is highly sensitive to moisture.  If it is left in air, part-A component will react with atmospheric moisture and will be ruined.  This reaction is non-reversible.  Soon after opening a can and dispensing the content, dry nitrogen gas or argon gas needs to be injected to the container to blanket the material.  Silica gel or calcium chloride desiccant filter should be installed to 55 gallon drum-vent for your drum dispensing system.  The storage temperature should be at a room temperature between 70 and 90 F.


Part-B component is hygroscopic.  If the material is exposed to ambient air, 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 atmospheric air.  For long term storage, purging the empty space in the container with dry nitrogen gas, argon gas, or negative-40-degree-due-point dry air is also recommended to prevent moisture contamination of part-B. The storage temperature should be at a room temperature between 60 and 90 F.  Store the containers in a dry indoor space.


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




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



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