++MPP-W43B
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.
MPP-W43B
Shore OOO Range Polyurethane Gel Material
MPP-W43B is one of our polyurethane gel formulations specifically designed for padding and cushioning application that requires Shore Durometer OOO scale hardness. With this material, a user can obtain good rebound characteristics and gentle increase of compression deflection value. At OOO hardness, this material provide an exceptionally gentle feeling. The material does not contain plasticizer, which are known to leach and have adverse effect to the plastic film encapsulation materials used in conjunction with gel materials. The applications for this material includes cushioning and padding parts, fiber optic cable encapsulation, novelty products, and many more. This polyurethane gel material is formulated in such a way that the user can control/choose the hardness/deflection properties of the product simply by changing the mixing ratio of the components within a range.
Part-A: MPA-050
Part-B: PPA-098
Mixing Ratio:
Hardness Range Mixing Ratio
Shore OOO 30 A:B = 1:5.2 by weight
Shore OOO 43 A:B = 1:4.8 by weight
Shore OOO 53 A:B = 1:4.6 by weight
Shore OO 25 A:B = 1:4.0 by weight
High Shore OO range A:B = 1:3.0 by weight
*The hardness are typical value within + or - 5 OOO or OO Durometer units. Harder products have faster rebound time after compression force is released. The data is guidance only. The user must check the mixing ratio and yielding hardness for each application.
The user can change the softness by changing the mixing ratio. The hardest ratio can be about 1:3; higher the part-B ratio softer it gets. You need to find the mixing ratio to fit the hardness best fit to your application. When you make a product in a soft range, you may see some polyol residue leaching out of the material. If the application requires OO Shore range hardness, we recommend MPP-V37A instead of this formulation.
The following is the processing parameters of 1:5.2 mixing ratio, ambient temperature for the component materials and the mold. Harder material has faster curing pattern in general.
|
Pot Life |
5 Minutes at ambient temperature |
|
Demolding Time |
2 - 5 hours at ambient temperature |
|
Complete Cure |
1 - 2 days at ambient temperature |
Part-A material is highly viscous at a room temperature. If casting machine is used for high volume production, part-A can be heated up to 160 °F to lower the viscosity, which helps well-mixing of the components. Higher operating temperature will increase the cure rate. Also, catalyst can be used to increase the production rate.
In the container of part-A, there will be dark/thick settlement at the bottom of the container. This part of the material is not usable. If this dark/thick settlement enters to the batch, it will make hard lumps and the part will not be consistent. Do not use the dark/thick settlement at the bottom of the container. We do not offer discount against the unusable part of the material.
This material is often encapsulated with coated cloth material, polyurethane film, or other resilient materials. The surface of gel product is very sticky, and the gel can be cut or torn easily. The encapsulation is essential for protection of the gel in some applications. 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.
The mixing operation should be done in a well-ventilated area. The operators should wear rubber gloves, long sleeves, and protective eyeglasses and avoid skin/eye contact of material. Please refer to the Material Safety Data Sheet for handling and disposal information.
Handling Information:
Storage:
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 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 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 ºF.
Part-A material is known to have a dark high viscosity settlement. This settlement should not be re-blended. The material above the settlement should be usable, just avoid using the material at the very bottom of the container if you see dark settlement.
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. The moisture contamination of part-B material is reversible. By heating material to 160 - 180 ºF and vacuuming it at about 29" Hg negative pressure for several hours will reduce the moisture level. Avoid exposure of the material to air. Purging the empty 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 as well. The storage temperature should be at a room temperature between 65 and 90 ºF.
Handling:
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.
For any questions, please contact Northstar Polymers.
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.
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