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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.

 

 

 

 

 

 MSN-V40A

(Polyester Base Low-Rebound Impact/Vibration Dampening Gel)

This polyurethane casting material is developed for applications that require Shore OO 40 range casting material with vibration dampening property and higher strength than our standard polyurethane gel material. The low tack surface of this material is also useful for application that does not use film/fabric encapsulation. At the elevated temperature, the component materials have lower viscosity for better flow in the mold for good resolution to reproduce fine mold surface or making thinner film/sheet material.

Processing this material requires elevated temperature process and constant agitation of part-B component. This material contains plasticizer. Plasticizer in general leaches out in a long term use of the product. This material is not recommended for applications that require cast-in encapsulation into plastic film material. Please review MPP-V37A for applications require film encapsulation and room-temperature processing.

Processing Information:

Components:

Part-A: MSA-018

Part-B: SBX-146

Typical Processing Parameters:

Temperatures

Part-A: Ambient

Part-B: 160 170 F

Mold: 180 F 

Pot-life: 7 - 9 minutes

Demolding Time:1-1/2 hours at 180 F mold temperature

Complete Cure:8 16 hours at 160 -180 F post cure

*Shore OO 40 hardness in 24 hours after cooled

Mixing Ratio: 1: 8.363 by weight (1: 8.852 by volume)

This material can be made slightly softer if you increase part-B ratio (within 2 3% range). The mixing ratio (or stoichiometry ratio) affects the hardness of the product. Regular calibration of mixing ratio is recommended when it is used in meter-mixing/dispensing equipment.

Typical hardness of the cured product is Shore OO 40. Bashore rebound 18%. This is polyester base material. In general, polyester base material has better resistance to oil/hydrocarbon type chemicals. It is not recommended in applications that involve constant water contact. The component materials used in this formulation are all within the FDA list for polyurethane components to make dry-food contact materials.

Part-B contains a solid material (molecular sieves or moisture scavenger) to prevent bubbles during the gel-time. This material may settle at the bottom of the container during the storage. Agitate part-B before dispensing to keep this material suspended. If you use this in a large retaining tank to feed your meter-mixing/dispensing equipment, we recommend slow constant agitation of the material under nitrogen blanket.  

The Components Data

Part-A

Product Code:

MSA-018

Description:

Isocyanate terminated prepolymer extended with polyester polyol

%NCO:

23% (+/- 0.6%)

Amine Equivalent

183 (+, - 0.5% measurement deviation )

Specific Gravity:

1.204

Physical State at 25 C ( 77 F):

Liquid

 

Viscosity at 25 C (77 F):

1200 cps (+/- 300)

Storage:

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 -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. Also, there are different types of raw materials that could separate within the container while storing. Please heat the material to 140 -160 F and stir the content before use.

Part-B

Product Code:

SBX-146

Description:

Curing agent based on a blend of polyols and additives

OH number:

36.5 40.0

Equivalent Weight:

1455 (+, - 7% measurement deviation)

Specific Gravity:

1.1378

Physical State at 25 C ( 77 F):

Amber to brown color waxy solid or Paste

 

Viscosity at 71 C (160 F):

800 1400 cps

Agitation Requirement

The white solid material separates and settle to the bottom. Constant agitation is recommended if stored in a retaining tank for dispensing equipment for continuous casting.

Storage:

Store in a dry indoor storage at room temperature. The material is hygroscopic. 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.

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 air. It is recommended the material is blanketed in try nitrogen gas.

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.

Safety:

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.  

 

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