Northstar Polymers, LLC
3444 Dight Avenue So.
Minneapolis, MN 55406
Tel: 612.721.2911
Fax: 612.721.1009
E-Mail:
Northstar Polymers, LLC is a member of Polyurethane Manufacturers Association.
Copy right reserved by Northstar Polymers, LLC 2000 - 2007. Northstar Polymer prohibits duplication of the contents of this web site for the purposes of public display and/or using on another web site without a written authorization by Northstar Polymers, LLC.
- High Performance Casting Systems
+Polyester Base High-Performance
++ Ester Base Full Prepolymer Systems
+Polyether Base High-Performance
++ Ether Base Full Prepolymer Systems
- Click Here for Isocyanate-Prepolymer Products
- Room-Temperature-Curable Systems
Ester Base High-Performance Formulations
Ester base high-performance polyurethanes are known for high tensile strength, excellent abrasion resistance as well as cut/tear resistance. Parts molded with these types of materials are used in a variety of applications including liners in material handling, grain elevator buckets, pulleys, sprockets, and other mechanically demanding applications. These are also known for excellent oil resistance; however, for long-term use in constant aqueous environments, we recommend considering one of our polyether systems listed under this.
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These are systems consist of a MDI/Ester prepolymer at higher %NCO (15 - 26 %) cured with our special curatives. "Quasi" systems are known for low viscosity and relatively lower processing temperature.
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Die-C Cut/Tear Resistance (pli) |
Sprit Tear Resistance (pli) |
Abrasion Resistance (mg loss) |
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95 A |
5500 |
700 |
913 |
576 |
75 |
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85 A |
6200 |
800 |
720 |
475 |
30 |
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80 A |
6000 |
900 |
600 |
350 |
15 |
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70 A |
4200 |
800 |
300 |
160 |
12 |
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These are conventional prepolymer systems consists of MDI/Ester prepolymers at lower %NCO (less than 15 %), can be cured with 1,4-Butanediol, other standard amine/polyol urethane curatives, or our special curing agents. These are commonly called "hot-cast" urethane systems.
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Die-C Cut/Tear Resistance (pli) |
Sprit Tear Resistance (pli) |
Abrasion Resistance (mg loss) |
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60 D |
6120 |
300 |
950 |
461 |
85 |
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95 A |
4260 |
400 |
700 |
300 |
80 |
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90 A |
4200 |
650 |
600 |
300 |
62 |
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85 A |
5800 |
725 |
725 |
450 |
22 |
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Products
- Our Products
§ High Performance Elastomers
· MDI/Ether
Ether (PTMEG) Base High-Performance Formulations
Ether (PTMEG) base high-performance polyurethanes are known for "high-energy" characteristics, which include high-rebound, excellent abrasion resistance, and high elongation. Together with their excellent tensile and cut/tear resistance, parts molded with these materials are preferred in a variety of applications including inline skate wheels, sizing screens for mined products such as rocks/sand/minerals, material handling parts, and other highly demanding applications. These are also known for excellent water resistance and are recommended for long-term use in constant aqueous environments.
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These are systems consist of a MDI/Ester prepolymer at higher %NCO (15 - 26 %) cured with our special curatives. "Quasi" systems are known for low viscosity and relatively lower processing temperature.
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Die-C Cut/Tear Resistance (pli) |
Sprit Tear Resistance (pli) |
Abrasion Resistance (mg loss) |
Bashore Rebound (%) |
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80 A |
4000 |
750 |
450 |
250 |
8 |
68 |
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70 A |
3800 |
900 |
350 |
200 |
3 |
70 |
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These are conventional prepolymer systems consists of MDI/Ester prepolymers at lower %NCO (less than 15 %), can be cured with 1,4-Butanediol, other standard amine/polyol urethane curatives, or our special curing agents. These are also commonly called "hot-cast" urethane systems.
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Die-C Cut/Tear Resistance (pli) |
Sprit Tear Resistance (pli) |
Abrasion Resistance (mg loss) |
Bashore Rebound (%) |
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50 D |
4100 |
250 |
610 |
225 |
90 |
30 |
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90 A |
3610 |
840 |
560 |
134 |
35 |
62 |
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Products
- Our Products
§ Room-Temperature-Curable Formulations
Because of the low-cost mold and simple molding process, using this type of material requires a relatively smaller initial investment to start a production. The materials cure at room temperature; thus, very often, the initial tooling and equipment cost can be very low. Some of the existing applications are:
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Concrete molds and patterns |
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Vibration dampening, noise reduction, bumpers, and padding products |
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Encapsulation material for electronic components |
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Prototyping and small runs of products |
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Die-C Cut/Tear Resistance (pli) |
Sprit Tear Resistance (pli) |
Mixing Ratio By Volume (Weight) |
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30A |
260 |
550 |
40 |
20 |
1: 1.053 (1:1) |
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47A |
450 |
520 |
90 |
14 |
1:3 (1:2.618) |
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50 A |
248 |
130 |
45 |
7 |
1:3.200 (1:2.790) |
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55 - 60A |
366 |
157 |
118 |
14 |
1:2.730 (1:2.383) |
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65A |
480 |
180 |
92 |
15 |
1:2.633 (1:2.300) |
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80 A |
1100 |
180 |
140 |
25 |
2:3 (1:1.312) |
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90A |
1800 |
350 |
250 |
90 |
1:1 (1: 0.877) |
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65 - 70 D |
3600 |
60 |
880 |
ND |
4: 3 (1: 0.675) |
Rigid Urethane (for prototyping of plastic product etc.)
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Flexural Strength (psi) |
Flexural Modulus (psi) |
Mixing Ratio By Volume (Weight) |
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80D |
8000 |
5 |
10,000 |
300,000 |
1:1 (1: 0.878) |
§ Concrete Mold Making Resins
The following casting resin systems are specially formulated to serve mold-making application for pre-cast concrete operations. The components for these formulas are less moisture sensitive than the general purpose formulas. Pot-lives for these formulations are relatively long to allow wide working time. The mixing ratios are made to be easy one-to-one or one-to-two ratio for ease of handling.
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Product Code |
Hardness (Shore Durometer) |
Tensile Strength (psi) |
Ultimate Elongation (%) |
Die-C Cut/Tear Resistance (pli) |
Sprit Tear Resistance (pli) |
Mixing Ratio By Volume (Weight) |
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25A |
311 |
291 |
61 |
20 |
1: 1 (1: 0.966) |
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30A |
487 |
435 % |
148 |
52 |
1: 2 (1:1.869) |
Products
- Our Products
§ Polyurethane Gel Elastomer Formulations
Polyurethane gel elastomers are used lately in variety of applications. Computer keyboard/mouse wrist rests, bicycle/motorcycle sheets, shoe insole, and various padding parts are some of the products that use these polyurethane gel type materials. Northstar Polymers is an expert in polyurethane gel formulating. We create many custom formulations to meet specific needs of the applications. The following are some of our polyurethane gel elastomer materials.
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Product Code |
Hardness (Shore Durometer) |
Properties and Characteristics
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"Standard Gel" |
OO 37* * variable hardness in a Shore OO Range. |
MPP-V37A is our standard polyether base polyurethane gel elastomer. The components are both liquid at room temperature. It is formulated in such way that the user can change the softness of the products simply by changing the mixing ratio. The material can be made to the softness range between Shore Durometer OO 5 to OO 40. Common uses of this material include computer keyboard/mouse wrist rests, bicycle/motorcycle sheets, shoe insole, respirator gasket, and many more. Natural color: translucent with slight yellow tint
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"Low Rebound Gel" |
Shore OO Range |
MCP-V40A is polyether base polyurethane gel elastomer. This material is specially designed to yield elastomeric parts with very low rebound property. The possible applications include vibration dampening/ impact dampening parts for various machinery and ergonomics products. Natural color: Cloudy Translucent Dark Yellow
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"Polyester base, oil resistant gel" |
OO 40 |
MSN-V40A is a polyester base polyurethane gel elastomer. This material is designed to be processed at an elevated temperature. Its vibration dampening property and higher oil resistant property are ideal for vibration dampening application for machinery and other customer applications. Natural color: Cloudy Translucent Amber
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"Thin casting gel"
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OO 60 - 70 |
GK-7 is formulated for manufacturing a thin layer of polyurethane gel film by casting or laminating method. The component material has lower viscosity to allow a good flow of the material for production of gel film or thin gel sheets.
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"Standard OOO scale soft gel" |
OOO range |
MPP-W43C is formulated for applications which require OOO Durometer hardness self-standing parts, where MPP-V37A cannot achieve without loosing integrity as a self-standing part without encapsulation.
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"Low viscosity, bio-base OOO scale gel" |
OOO range |
MPC-W44A is formulated for applications which require OOO Durometer hardness similar to MPP-W43C, but achieving the goal by use of low viscosity components. This material contains bio-base renewable materials, which can be above 40% of the total weight.
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"Microcellular Foam gel" |
OOO range |
MCG-1 is a very unique combination of polyurethane gel and microcellular foam. The cured material contains small amount of foam within. It has very soft surface and very gradual compression deflection characteristic.
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MYP-V40A
"Low Speed Tire Filler Gel"
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OO 40 | MYP-V40A 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. It contains bio-base component by 60%. |
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"Lower viscosity OOO Scale Gel" |
OO range |
SAI-1 is formulated to yield Shore Durometer OO range elastomer gel material from low viscosity components at room temperature. Possible applications with this material include inner coating for puncture-free tires and encapsulation of electric components and cables.
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Products
- Our Products
§ Polyurethane Foam Formulations
Polyurethane Foams are used in a wide variety of applications. Polyurethane foams can be categorized in a few different types by the cell structure (closed-cell/open-cell) or the mechanical characteristics (rigid, semi-rigid, and flexible).
Products
- Our Products
§ Polyurethane Foam Formulations
Rigid foams are widely used in insulation applications. However, it can be used in a wider range of applications. It’s load bearing strength at higher density can be utilized in potting application for to protect equipments and structures. Easy room-temperature-mixing and forgiving ratio variation allow this class of materials to be used in cast-in-place applications of various ranges. Generally, higher density foam has higher mechanical strength.
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Product Code |
Density |
Properties and Characteristics |
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2.6 LBS/Cuft (Free rise) |
Closed cell rigid foam with 2.6 lbs/cuft common in cast-in-place applications for insulation and filling. Mixing Ratio: 2:1 by weight. Natural color: Dark yellow to amber color.
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6.6 LBS/Cuft (Free rise) |
Closed cell rigid foam with 6.6 lbs/cuft common in cast-in-place applications. Also used as potting compound for load bearing electronic parts. Higher density provides improved load bearing properties over MPP-R03A. Mixing Ratio: 1:1 by volume. Natural color: Dark yellow to amber color.
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20 LBS/Cuft (Free rise) |
Closed cell rigid foam with 20 lbs/cuft common in cast-in-place applications. This foam is designed to be a bonding agent tp compound a load bearing material. Flexural strength 1090 psi, compressive strength 950 psi. Mixing Ratio: 1:1 by volume. Natural color: Dark yellow to amber color.
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Products
- Our Products
§ Polyurethane Foam Formulations
Semi-rigid foams can be used in molded parts production. Specially, when the part needs to withstand impact force, semi-rigid foam stands better than rigid foam. Slight “give” in the physical property of semi-rigid foam absorb impact forces better and keep it from chipping off or cracking.
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Product Code |
Density |
Properties and Characteristics |
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2.5 LBS/Cuft (Free rise) |
Mostly closed cell semi-rigid rigid foam with 2.5 lbs/cuft. This material is developed for compression molding process to make light parts used in a sport/recreation product, which impact resistance and light weight are both required. Mixing Ratio: 4:1 by volume. Natural color: White.
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5.5 LBS/Cuft (Free rise) |
Mostly closed cell semi-rigid foam with 5.4 lbs/cuft. This material is designed for backing/support of molds used in pre-cast concrete parts production. Its slight “give” is useful when the mold is used with vibrating equipment in concrete parts production. Mixing Ratio 4:1 by volume. Natural color: White.
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9.0 LBS/Cuft (Free rise) |
Mostly closed cell semi-rigid foam with 9.0 lbs/cuft. This material is designed to serve applications which require the part structure to have a load-bearing capacity. Most notably, the material has a long pot-life (5 min.) for this class, which allows an easier hand mixing/pouring operation and making larger parts.
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Products
- Our Products
§ Polyurethane Foam Formulations
Microcellular foams are high density closed cell foams. Some of our microcellular foam materials are made with high-performance class materials. The microcellular foams can be formulated to have very high mechanical properties.
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Product Code |
Hardness (Shore Durometer) |
Free-Rise Density (LBS/Cuft) |
Packing Density (LBS/Cuft) |
Bashore Rebound (%) |
Base Polyol |
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45A |
23.0 |
25.5 |
20 |
Liquid Polyether |
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60A |
19.7 |
25 |
19 |
High Performance Ester |
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70 A |
18.5 |
25 |
28 |
High Performance Ester |
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25A |
22.3 |
25 |
23 |
High Performance Ester |
Products
- Our Products
§ Polyurethane Foam Formulations
Flexible open-cell foams are widely used in cushioning applications, such as seating, padding, toys, and other custom applications.
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Product Code |
Density (Free Rise) |
Properties and Characteristics
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6 LBS/Cuft
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This foam formulation is designed to make cushioning products by either hand-mixing or machine casting. This formulation does not use auxiliary blowing agent such as HCFC, CFC, or hydrocarbon blowing agent. The components are liquid at room temperature. For a small quantity, this can be batched manually by hand tools. This can be open-cast into a slab or molded in a compression mold. Natural color: White
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8 LBS/Cuft
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This foam formulation is designed to make firmer grade of flexible foam for cushioning and vibration dampening products by either hand-mixing or machine casting. The firmer quality of this foam may be suitable for packaging material of heavier items, flexible mold backing, or bumper parts. The components are liquid at room temperature. For a small quantity, this can be batched manually by hand tools. This can be open-cast into a slab or molded in a compression mold. Natural color: White
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10 LBS/Cuft
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This foam formulation is designed to make lexible foam with viscoelastic type slow recovery property for cushioning and vibration dampening products by hand-mixing or machine casting method. The very soft compression deflection and slow recovery properties of this formulation may be suitable for many cushioning and other unique products. The major component material is polyether base polyol, and it has lower hardening temperature than polyester bass viscoelastic foams. The components are liquid at room temperature. For a small quantity, this can be batched manually by hand tools. This can be open-cast into a slab or molded in a compression mold. Natural color: White with some yellow tint.
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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 A PARTICULAR PURPOSE.