Poly Labs manufactures polyurethane (PU) outsoles for a range of footwear applications. For over 40 years, we’ve molded polyurethane to form both lightweight and durable outsoles.
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Polyurethane Outsole Designs
Poly Labs PU outsoles are available in single-density, dual-density and triple-density. These can be over-molded products and customizable with limitless color, stain, finish and traction options.
Examples of polyurethane outsole design features include: standard, slip-resistant, puddle pour, two color, and more.
![](https://polyurethanelaboratories.com/wp-content/uploads/2020/11/Poly-Labs-Shoe-Outsole-1024x683.jpg)
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Dual Density Footwear Outsoles: PU Elastomer
Poly Labs utilizes a high-density PU Elastomer (U-57) as a bottom material for dual density outsoles. Likewise, the elastomer is used for conventional polyurethane molding. It is also used for pads in “puddle pour” molding.
![Dual Density PU Elastomer Footwear Outsole](https://polyurethanelaboratories.com/wp-content/uploads/2020/11/Polyurethane-Elastomer-Dual-Density-Outsole-1024x683.jpg)
We utilize this same elastomer in other articles in which a durable and solid cast material is necessary. Customers who desire superior flexibility and abrasion properties appreciate the U-57 elastomer material.
PU Elastomer U-57 for Footwear Outsoles Specifications
The qualities for U-57 PU elastomer are as follows:
Density | 1.0 – 1.1 g/cm³ |
Hardness, Shore A | 50 – 60 |
Tensile Strength | 1150 psi |
Elongation | 650% |
Die C Tear | 210 pli |
Ross Flex, cycles to failure @ -20°F | > 30,000 |
Ross Flex, cycles to failure @ 0°F | > 100,000 |
Ross Flex, cycles to failure @ 72°F | > 100,000 |
Abrasion Resistance, Taber, mg loss per 1,000 cycles | < 100 |
DIN 53516 Abrasion Resistance (mm³ loss) | 128 |
Oil Swell | |
ASTM #3 | 1.9 % |
Fuel B | 29.7 % |
Fuel F – Diesel | 8.8 % |
Static Coefficient to Friction, James Test | |
Dry | 1.1 |
Wet | 0.94 |
Static Coefficient to Friction, Mark II | |
Dry | 1.1 |
Wet | 0.4 |
Oily | 0.37 |
Oily / Wet | 0.16 |
Linear Shrink | 1.0 % |
Our 40 year history of PU molding allows us to take your concepts from ideas and turn them into reality. PU outsoles are be made-to-order, per the requirements of the customer. Whether you require a double-density design, slip-resistance options, or specialty colors and finishes – you can count on Poly Labs unique ability to meet each of our clients unique requirements, and exceed your expectations.
![](https://polyurethanelaboratories.com/wp-content/uploads/2020/11/Polyurethane-Manufacturer-USA-1024x683.jpg)
![](https://polyurethanelaboratories.com/wp-content/uploads/2020/11/Polyurethane-Lab-Testing-1024x683.jpg)
Poly Labs has a world-class facility in Lewiston, Maine to support our efforts in outsole manufacturing. When you combine technical resources, precision tooling, industry knowledge and expertise – you get Poly Labs, a North American leader in polyurethane outsoles.
![Footwear Outsoles](https://polyurethanelaboratories.com/wp-content/uploads/2020/11/DSC_0373-1024x683.jpg)
![Footwear Outsoles](https://polyurethanelaboratories.com/wp-content/uploads/2020/11/DSC_0309-1024x683.jpg)
For more information on PU Elastomer and polyurethane footwear outsole manufacturing, please contact our sales team.