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Urethane casted photoelastic samples
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[Smooth On](https://www.smooth-on.com/)
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The method described in details here have been first introduced by [Cox *et al.*](http://iopscience.iop.org/article/10.1209/0295-5075/115/64003/meta) and [Barés *et al.*](https://www.epj-conferences.org/articles/epjconf/abs/2017/09/epjconf162463/epjconf162463.html)
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Making a mold of the sample
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[Mold Star silicone](https://www.smooth-on.com/product-line/mold-star/)
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[this one](https://www.smooth-on.com/products/mold-star-15-slow/) fits for most of the cases
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Picking the right urethane
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--------------------------
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[Clear Flex](https://www.smooth-on.com/product-line/clear-flex/)
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[this one](https://www.smooth-on.com/products/clear-flex-50/) is the most commonly used
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if you want to slightly color the sample for imaging purpose you should us [So Strong](https://www.smooth-on.com/products/so-strong/) dye
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Casting method
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* Pouring polymer and crosslinker
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* Adding color
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* degassing the urethane
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* pouring in molds
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