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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.








OO Scale Low Rebound Gel for Vibration Dampening and Impact Absorption


MCP-V40A is one of our polyurethane gel formulations specifically designed for padding and cushioning applications, where low rebound property of the material is critical.   This viscoelastic polymer is a two-component urethane casting system, which can easily be processed to make variety of products in various vibration-dampening, shock absorbing, and cushioning applications.


The impact absorption property can be indicated by rebound property of the material.  The chart below shows Bashore Rebound test data in comparison with a well-known vibration dampening material marketed by Sorbothane. The test data on our standard polyurethane gel formulation MPP-V37A is there to show the enhanced low-rebound property of MCP-V40A.   


Polyurethane gel class polymers in general are made in such way that user can easily control the hardness of the product by simply changing the mixing ratio of the same combination of two component materials.  This means MCP-V40A and other polyurethane gel systems can be used in a range of various applications, which require different hardness. 


Typically in polyurethane gel formulation systems, softer products made with the ratio adjustment have lower rebound property.  The chart shows the rebound property changes as the function of change in hardness of the yielded 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.


Stoichiometric Ratio NCO: OH

Weight Ratio  

Part-A: Par-B 

Hardness Shore OO Scale

1.000: 1.000

1.000: 2.050


1.000: 1.100

1.000: 2.255


1.000: 1.200

1.000: 2.460


1.000: 1.300

1.000: 2.665


1.000: 1.400

1.000: 2.870


1.000: 1.500

1.000: 3.075


1.000: 1.600

1.000: 3.280


1.000: 1.700

1.000: 3.485


Note: The above data is based on our lab tests, and it is reference only.  The user must test the mixing ratio and yielding hardness for each application.  The product hardness can be controlled more accurately by the stoichiometric ratios.  However, in practice, you may use weight ratio or volume ratio for the parameter value to determine the target hardness unless you have a very narrow tolerance range for hardness.  You may need to adjust your mixing ratio according to the actual hardness produced from different lots of components in order to obtain more accurately consistent results. 

 Typical Processing Conditions

Processing Temperature:

Part-A:              Room Temperature

Part-B:              Room Temperature

Mold:                Room Temperature

Curing Pattern 

Pot life:                               15 20 minutes at ambient temperature

Demolding:                           3 - 6 hours at ambient temperature

Complete Cure:                     3 - 5 days at ambient temperature

Note: This curing data is the processing parameters of 1:2.25 mixing ratio at room temperature.  The curing rate may vary depending on the mixing ratio chosen for the process. The curing pattern can be modified by addition of a catalyst. Please consult Northstar Polymers for the modification.




Mixing ratio setting for your dispensing equipment is critical to the hardness determination.  We recommend the mixing ratio is calibrated by dispensing the two components from the line to two cups, and use weight ratio to check for accurate metering. 


This material is often encapsulated in coated cloth materials, polyurethane films, or other resilient materials. The surface of gel product is very sticky, and the gel can be cut or torn easily in many applications.  The encapsulation is essential for protection of the gel in some applications.  Please contact us for more information on encapsulation method. For temporary handling, you may use talc powder to prevent it from sticking to the handlers or equipment.


Use of elevated temperature during the pouring process may cause shrinkage of this material.  Shrinkage will be a critical issue if you are pouring this material directly on a flexible film.  The shrinkage could cause significant wrinkling of the film or warping.  If excessive wrinkle occurs, the processing temperature may need to be lowered and processing rate to be slowed.


Component Data:




Product Code: 



Isocyanate terminated prepolymer extended with polyether polyol


18.6 % +, - 0.5%

Equivalent Weight


Specific Gravity:


Physical State at 25 C ( 77 F):

Liquid (dark yellow color)


Viscosity at 25 C (77 F):

500 1200 cps


Store in an airtight container in a dry indoor storage area 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 purge and blanket the top space before storing.  Storage temperature above 110 F or below 65 F will accelerate the undesirable subsequent reaction within the material and shorten the shelf life.




Product Code: 



Curing agent based on a blend of polyether polyols and additives

Equivalent Weight:


Specific Gravity:


Physical State at 25 C ( 77 F):

Liquid (clear with yellow tint)


Viscosity at 25 C (77 F)

300 900 cps


Store in an airtight container in a dry indoor storage area at room temperature.  The material is hygroscopic, and absorption of excess moisture can cause issues when processed. For long-term storage, inject dry nitrogen 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 detail information on the safety and handling of the materials.  The MSDS for each component is sent with the material shipment. 


When you are 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, we recommend, in addition to the above, installation of a proper dynamic ventilation system and/or using a proper respirator 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 Material Safety Data Sheet for each component for the detailed health information.




Part-A component (prepolymer) contains isocyanate component, which is very much 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, nitrogen gas or negative-40-degree-due-point dry air 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 100 F.


Part-B component may be 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 air.  Purging the top space in the container with nitrogen 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


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.



Revised 6/8/10


Processing Instructions for Test Mix

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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