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Tandem Products, Inc.

DBA Northstar Polymers

3444 Dight Avenue So.

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail:

info@northstarpolymers.com

 

 

 

Copy right reserved by Northstar Polymers 2000 - 2018.  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.

 

 

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- High Performance Casting Systems

 

       +Polyester Base High-Performance

            ++ Ester Base Quasi Systems

            ++ Ester Base Full Prepolymer Systems

 

       +PTMEG Polyether Base High-Performance

            ++ Ether Base Quasi Systems

            ++ Ether Base Full Prepolymer Systems

 

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.

Ester "Quasi" Systems

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.

 

Product Code

Hardness (Shore Durometer)

Tensile Strength

(psi)

Ultimate Elongation

(%)

Die-C Cut/Tear Resistance (pli)

Sprit Tear Resistance

(pli)

Abrasion Resistance

(mg loss)

MSS-A95BQ

95 A

5500

700

913

576

75

MSS-A85BQ

85 A

6200

800

720

475

30

MSS-A80AQ

80 A

6000

900

600

350

15

MSS-A70GQ

70 A

4200

800

300

160

12

Ester "Full Prepolymer" Systems

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.

 

Product Code

Hardness (Shore Durometer)

Tensile Strength

(psi)

Ultimate Elongation

(%)

Die-C Cut/Tear Resistance (pli)

Sprit Tear Resistance

(pli)

Abrasion Resistance

(mg loss)

MSB-D60A

60 D

6120

300

950

461

85

MSB-A95A

95 A

4260

400

700

300

80

MSS-A90A

90 A

4200

650

600

300

62

MSS-A85C

85 A

5800

725

725

450

22

PTMEG polyether 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.

Ether "Quasi" Systems

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.

 

 

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

(%)

MGB-A80AQ

80 A

4000

750

450

250

8

68

MGG-A70DQ

70 A

3800

900

350

200

3

70

Ether "Full Prepolymer" Systems

 

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.

 

 

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

(%)

MGP-D50A

50 D

4100

250

610

225

90

30

MGB-A90A

90 A

3610

840

560

134

35

62

Room Temperature Curable Polyurethane Casting Systems

 

Because of the low-cost mold and simple molding process, using Room Temperature Curable Polyurethane Casting Systems are widely used in a wide variety of applications.  Some of the existing applications are:

  • Mold Making Material for Precast Concrete Products

  • Concrete Stamps

  • Vibration dampening, noise reduction, bumpers, and padding products

  • Gaskets

  • Encapsulation/Potting compound for electronic components

  • Prototyping and small runs of products

 

NOTE: The gray shaded products are our new improved formulas intended for mold-making materials for precast concrete applications.

 

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)

MPP-A25E

25A

389

995

90

27

1: 2

(1: 1.910)

MPP-A30A

30A

260

550

40

20

1: 1.053

(1:1)

MPP-A40E

40A

867

1037

134

42

1: 1.080

(1:1)

MPP-A47A

47A

450

520

90

14

1:3

(1:2.618)

MPP-A50A

50 A

248

130

45

7

1:3.200

(1:2.790)

MPP-A50E

50 A

1301

708

248

74

1:1

(1:0.920)

MPP-A60A

55 - 60A

366

157

118

14

1:2.730

(1:2.383)

MPP-A65A

65A

480

180

92

15

1:2.633

(1:2.300)

MPP-A80E

80 A

1100

180

140

25

2:3

(1:1.312)

MPP-A90A

90A

1800

350

250

90

1:1

(1: 0.877)

MPP-D65A

60 - 70 D

1250

34

388

ND

2:3

(1: 1.250)

MPG-D70A

65 - 70 D

3600

60

880

ND

4: 3

(1: 0.675)

Rigid Urethane (for prototyping of plastic product etc.)

 

 

Product Code

Hardness (Shore Durometer)

Tensile Strength

(psi)

Ultimate Elongation

(%)

Flexural Strength

(psi)

Flexural Modulus

(psi)

Mixing Ratio

By Volume

(Weight)

MPP-D80B

80D

8000

5

10,000

300,000

1:1

(1: 0.878)

 

Specialty Room-temp-cure Urethanes

 

 

Product Code

Special Attributes

Hardness

Tensile Strength

(psi)

Ultimate Elongation

(%)

Die-C Cut/Tear Resistance (pli)

Sprit Tear Resistance

(pli)

Mixing Ratio

By Volume

(Weight)

MPP-A80H

Slow Cure

Low-Temp

Low-Shrinkage

80A

1818

813%

427

152

1:0.097

(1: 0.093)

Polyurethane Gel Elastomer Formulations

 

Polyurethane gel class materials are used in a variety of applications such as:

 

bullet

- Cushioning applications (making seat cushions, shoe insoles, bicycle seats, keyboard wrist rests)

 

bullet

- Pressure sensitive adhesives (PSA) applications (making sticky pads, lint removers, cell phone/tablet holders)

 

bullet

- Other specialty applications such as re-enterable electronic component potting applications and vibration dampening parts to protect sensitive electronics. 

 

Product Code

Hardness (Shore Durometer)

 

Properties and Characteristics

 

MPP-V37A

"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 

 

MCP-V40A

"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

 

MSN-V40A

"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

 

GK-7

"Thin casting gel for tack-pads applications"

 

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 may be used in tack pad parts for cell-phone holder and tablet holders. 

 

GK-22

"Sticker gel for tack-pads with higher adhesion property"

 

OO 20 - 50

GK-22 is formulated for manufacturing tack pads and other pressure-sensitive-adhesive products that require a higher adhesion property to hold heavier items or to provide enough adhesion in a small area. 

 

NTG-9

Low Tack, stand-along moldable gel.

OO 55

NTG-9 has much less surface tack than the other polyurethane gel type material.  Low viscosity components, fast cure, and low tack surface allows this material to be used in similar ways that TPE polymers are used.

 

MPP-W43D

"Standard OOO scale soft gel"

OOO range

MPP-W43D 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.

 

MPC-W44A

"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.

 

MCG-1

"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.  

 

MYP-V40A

"Low Speed Tire Filler Gel"

 

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%.

SAI-1

"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.

 

Polyurethane Foam Formulations

 

Polyurethane Foams are used in a wide variety of applications.  Open-cell flexible foams are widely used in seat cushion applications.  Closed-cell rigid foams are used in insulation applications.  Closed-cell rigid structural foams are used to support variety of structures and used for many molded products.  Microcellular flexible foams are used in more heavy duty cushioning applications such as railroad noise dampening pads.

  Rigid Closed-Cell Structural Foams

  

Rigid Structural Foams are widely used in insulation, product core, molded consumer products, and many other applications.    Itís 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.

 

 

Product Code

 

Density

 

Properties and Characteristics

MPN-R04B

4.0

LBS/Cuft

(Free rise)

Closed cell rigid foam with 3.5 - 4.0 lbs/cuft can be used in cast-in-place applications for mold-backing, filling, and insulation applications.  Mixing Ratio: 1:1 by volume. Natural color: Dark yellow to amber color.

 

 

MPP-R07B

6.5

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.

 

MPN-R20B

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.

 

    Microcellular Foam

 

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.  

 

 

Product Code

Hardness (Shore Durometer)

Free-Rise Density

(LBS/Cuft)

Packing Density

(LBS/Cuft)

Bashore Rebound (%)

Base Polyol

MPS-M23B

45A

23.0

25.5

20

Liquid Polyether

MSB-M25B

60A

19.7

25

19

High Performance Ester

MSB-M25C

70 A

18.5

25

28

High Performance Ester

MSB-M25F

25A

22.3

25

23

High Performance Ester

 

   Flexible Open-Cell Foam

 

Flexible open-cell foams are widely used in cushioning applications, such as seating, padding, toys, and other custom applications. 

 

Product Code

Density

(Free Rise)

Properties and Characteristics

 

MPA-F03A

3.3 LBS/Cuft

 

This foam formulation is designed to make cushioning products in molds.  The components are liquid at room temperature.  For a small quantity, this can be batched manually by hand tools. 

 

MPS-F04A

4.5 LBS/Cuft

 

This foam formulation is designed to make cushioning products by either hand-mixing or machine casting. 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 block or molded in a compression mold.   Natural color: Off White

 

MPS-F06B

5.5 LBS/Cuft

 

This foam formulation is designed to make cushioning products by either hand-mixing or machine casting. 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 block or molded in a compression mold.   Natural color: Off White

 

MPP-F07A

(Easier Mixing)

7.0 LBS/Cuft

 

This foam formulation is designed for easier foam-making operation with limited tools. The components are liquid at room temperature. This can be open-cast into a block or molded in a compression mold.   Natural color: Off White

 

 

MPS-F08A

7.5 LBS/Cuft

 

This foam formulation is designed to make a firmer cushioning products by either hand-mixing or machine casting. 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 block or molded in a compression mold.   Natural color: Off White

 

FFM-1

8.5 LBS/Cuft

 

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 block or molded in a compression mold.   Natural color: Off White

 

VEF-121

7 LBS/Cuft

 

This foam formulation is designed to make very soft viscoelastic foam parts in molds for specialty foam products. 

 

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.

∑        Semi-Rigid Foam

 

Semi-rigid foams are rigid, but with some give to resist impact forces. Semi-rigid foams can also be used as structural foam.

 

Product Code

Density

Properties and Characteristics

MPA-M02A

2.3

LBS/Cuft

(Free rise)

Open cell structural/ semi-rigid rigid foam with 2.3lbs/ft3.  This light weight impact resistance structural foam can be used in bumper parts, molded foam products, cast-in place gap filler, and many other custom applications. Due to the foam flexibility, a significantly smaller amount of saw dusts is produced when the foam is machined.  Mixing Ratio: 1:1 by volume. Natural color: Cream Color to Dark yellow.

 

MPP-M09B

"Slow Cure Foam"

8.5

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 some 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.